Franks custom transmissions 2026 build specs and pricing updates and more-
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Joined: Mar 2023
Posts: 1,795
Likes: 1,138
From: BERWICK PA
Franks custom transmissions 2026 build specs and pricing updates and more- STAGE 1 = STOCK REBUILD WITH NEEDED FIXES MILD SHIFT KIT $2200 No build specs for this one .Quality stock build for stock less than 375 RWHP .
Stage 2 - Up to 500 RWHP based on a 4000 lb car or truck
New Frictions
New steels
All seals
29 element input sprag
Heavy duty sunshell
Corvette servo with band pin o-ringed at 4th oil -second servo and 4th servo . Greatly reduces leaks for 3-4 cutch oil at the pin to case area and 4th oil which I have found many times is quiet substantial. Also eliminates servo pin to servo leaks 2nd and 4th . (4 o-rings)
New Borg Pro series band
Resurfaced reverse input drum
6 friction 3-4 set with full thickness steels and custom made backing plate. Apply plate surfaced to be perfectly flat.
Custom shift kit with moderate firm shifts that are progressive to aggressive as throttle increases. (O-RINGED 4-3 AND CONVERTER REGULATOR VAVLE END CAPS ) (O-RINGED BORE PLUGS FWD/REV)
Full time overrun mod to protect sprag keeps overrun clutch on in all forward gears except actual 4th gear
Modified but not eliminated PWM circuit custom. (FIXES ISSUES WITH LEAKS (1870 CODE) AND INCREASES LOCKUP APPLY WITHOUT ELIMINATING PWM/PROGRESSIVE APPLY)
AFL valve reamed and replaced if needed after testing
Custom 2-3 shift valve not Sonnax for quicker upshifts on the 2-3
.500 boost valve set with PR set up for 200 psi max line based on factory tuning set up. Can go as high as 230psi with tune change to 99 percent max (all three lands o-ringed to prevent leaks ) (uses additional spring in boost valve to increase overall line without raising AFL)
New wiring harness and shift solenoids
New factory style pan with removable drain plug heavy duty not cheap tin.
New bushings throughout
(dual bushings in rear sungear)
This unit is suitable for every day driver with light to moderate performance and heavy duty use comes with a 1 year no-hassle warranty; its simple you break it Ill fix it. Just send it back.
PRICE = $2500 WHICH INCLUDES SHIPPING NO CORE REQUIRED TO ANY PLACE IN MAINLAND USA
Price is for 1993 TO 2006 4L60E YEAR FORWARD OF THAT PLEASE ASK FOR PRICE AS I HAVE TO CHECK PRICE AND CORE AVAILABILITY.
NO RETURN CORE REQUIRED
STAGE 3 - 4L60E BUILD UP TO 750 RWHP BASED ON A 4000LB CAR
New Frictions
New steels
All seals
29 element input sprag
Beast sunshell
Corvette servo with band pin o-ringed at 4th oil -second servo and 4th servo . Greatly reduces leaks for 3-4 cutch oil at the pin to case area and 4th oil which I have found many times is quiet substantial. Also eliminates servo pin to servo leaks 2nd and 4th . (4 o-rings)
Band /DRUM cooling mod sprays D4 oil into band gap to aid in keeping band and drum cooler . Particularly useful when in 4th at light throttle or low speed up/down 4th gear shifts at low line.
Billet Dual servo overdrive 4h
New black Raybestos Pro series band.
New reverse or reman input drum. (Actually prefer reman or turned stock drums as the new drums are actually thinner I have noted)
7 friction 3-4 set carbon alto with custom made thick backing plate and thick steels .090 . Apply plate surfaced to be perfectly flat (Note one or two steels may be .076 as drums vary but strive for .090) for better heat dissipation.
Custom shift kit with moderate firm shifts that are progressive to aggressive as throttle increases. (O-RINGED 4-3 AND CONVERTER REGULATOR VAVLE END CAPS ) (O-RINGED BORE PLUGS FWD/REV)
Full time overrun mod to protect sprag keeps overrun clutch on in all forward gears except actual 4th gear (Engine braking 1-2-3 gears even in OD position).
New valve body plate
Modified but not eliminated PWM circuit custom. (FIXES ISSUES WITH LEAKS (1870 CODE) AND INCREASES LOCKUP APPLY WITHOUT ELIMINATING PWM/PROGRESSIVE APPLY)
AFL valve reamed and replaced.
Custom 2-3 shift valve, not Sonnax, for quicker upshifts on the 2-3 (THIS MOD IS UNIQUE TO MY BUILD OR WAS BUT HAS BEEN USED AND COPIED BY OTHERS, (DRASTICALLY IMPROVES 2-3 COMAND TO SHIFT TIME)
.500 boost valve set with PR set up for 200 psi max line based on factory tuning set up. Can go as high as 230psi with tune change to 99 percent max (all three lands o-ringed to prevent leaks ) (uses additional spring in boost valve to increase overall line without raising AFL)
New wiring harness and shift solenoids
New factory style pan with removable drain plug heavy duty, not cheap tin.
New bushings throughout
(dual bushings in rear sungear) SLOTTED SUN GEAR FOR IMPROVED PLANET LUBE
Slotted fwd sun gear (INCREASES LUBE TO FRONT PLANET AND FLOWS MORE OIL INTO FRONT PLANET THEN SLUNG INTO 3-4 CLUTCH FOR SOME ADDED COOLING)
This unit is suitable for anything everyday driver to all out performance beaten on
PRICE = $2750 WHICH INCLUDES SHIPPING NO CORE REQUIRED TO ANY PLACE IN MAINLAND USA
Price is for 1993 TO 2006 4L60E, YEARS FORWARD OF THAT PLEASE ASK FOR PRICE AS I HAVE TO CHECK PRICE AND CORE AVAILABILITY. 700R4 ALSO AVAIABLE IN THIS BUILD CALL OR MESSAGE FOR PRICE.
NO RETURN CORE REQUIRED
STAGE 4 4L60E BUILD UP TO 900 RWHP BASED ON A 4000LB CAR
New Frictions
New steels
All seals
29 element input sprag
Collared input drum re-enforcement
Sonnax smart shell
Fairbanks superior 2nd gear servo machined for use with the Sonnax 4th servo for maximum hold in 2nd and quickest apply to 3rd gear with band pin o-ringed at 4th oil, second servo and 4th servo . Greatly reduces leaks for 3-4 cutch oil at the pin to case area and 4th oil which I have found many times is quiet substantial. Also eliminates servo pin to servo leaks 2nd and 4th . (4 o-rings)
Band /DRUM cooling mod sprays D4 oil into band gap to aid in keeping band and drum cooler . Particularly useful when in 4th at light throttle or low speed up/down 4th gear shifts at low line.
Billet Dual servo overdrive 4h
New wide band (RAYBESTOS PRO SERIES )
New reverse input drum.
8 friction 3-4 set carbon alto with custom made thick backing plate. Apply plate surfaced to be perfectly flat with specially modified steel plates to aid in cooling (Plates are .076)
Custom shift kit with moderate firm shifts that are progressive to aggressive as throttle increases. (O-RINGED 4-3 AND CONVERTER REGULATOR VAVLE END CAPS ) (O-RINGED BORE PLUGS FWD/REV) (NOTE THIS BUILD SHIFTS CONSIDERABLY MORE AGRESSIVELY THAN OTHER BUILDS.)
Full time overrun mod to protect sprag, keeps overrun clutch on in all forward gears except actual 4th gear (Engine braking 1-2-3 gears even in OD position.
New valve body plate
Modified but not eliminated PWM circuit custom.
AFL valve reamed and replaced if needed after testing
Custom 2-3 shift valve, not Sonnax for quicker upshifts on the 2-3 (THIS MOD IS UNIQUE TO MY BUILD OR WAS BUT HAS BEEN USED AND COPIED BY OTHERS, (DRASTICALLY IMPROVES 2-3 COMAND TO SHIFT TIME)
5 pinion GM ONLY planets (SOME HAVE ASK FOR 4 PINIONS INSTEAD AS SOME FEEL THEY ARE STRONGER AND ONGOING DISSCUSSION, I HAVE HAD NO ISSUES WITH EITHER, HOWEVER IF YOU PREFER 4 PINION PLEASE LET ME KNOW FOR A 200 DOLLAR PRICE REDUCTON.
.500 boost valve set with PR set up for 200 psi max line based on factory tuning set up. Can go as high as 230psi with tune change to 99 percent max
New wiring harness and shift solenoids
New factory style pan with removable drain plug heavy duty, not cheap tin.
New bushings throughout
(dual bushings in rear sungear) Also slotted for better lube to rear planets .
Slotted fwd sun gear (INCREASES LUBE TO FRONT PLANET AND FLOWS MORE OIL INTO FRONT PLANET THEN SLUNG INTO 3-4 CLUTCH FOR SOME ADDED COOLING)
PRICE = $3700 WHICH INCLUDES SHIPPING NO CORE REQUIRED TO ANY PLACE IN MAINLAND USA
Price is for 1993 TO 2006 4L60E. YEARS FORWARD OF THAT PLEASE ASK FOR PRICE AS I HAVE TO CHECK PRICE AND CORE AVAILABILITY. 700R4 ALSO AVAIABLE IN THIS BUILD CALL OR MESSAGE FOR PRICE.
NO RETURN CORE REQUIRED
(Other notes: it says custom for a reason, I make changes in the builds suitable to the application and sometimes well something different is a better choice (example a truck used for towing HD/ PERFORMANCE who orders a stage 3 might get a Sonnax second gear less aggressive servo as it would be more suitable. Also a truck used dual purpose might get 7 friction 3-4 with thicker steels for better cycling heat dissipation.)
(NOTE I HAVE TROUBLE OF LATE GETTING OLDER 1 PIECE CASE CORES. I WILL CHECK AVALABILITY FOR THESE AND THE 700R4 WHEN YOU CONTACT TO ORDER. IN SOME APPLICATIONS , I MAY SUGGEST USING THE LATER LT-1 STYLE BOLT ON BELL STYLE UNIT INSTEAD. WE CAN DISCUSS AT TIME OF ORDER.
Also note ALL SALES ARE FINAL . I hate to have to include this but I am a small one man shop and do not have room nor keep inventory and you may note my prices are considerably below others for similar even lesser builds. So when you place order and pay, I immediately order parts and core; at that point I am committed thus so are you.
Other CUSTOM SERVICES are available O-RINGED BAND PINS, O-RINGED BORE PLUGS. VALVE BODY AND PLATE BUILDS (You send me your valve body), CUSTOM SHIFT KITS, MODIFIED SUPERIOR SUPER SERVOS FOR USE WITH SONNAX DUAL OVERDRIVE SERVO. Message me for price.
I also do the 4L80E BUT ONLY AS A LOCAL DELIVERY/PICKUP IN BERWICK PA. IN ADDITION TH350-400-C6-AOD-AODE-4R70W-A727-A518 and some others local delivery pickup only. I do not supply or ship any of these units. Message for price.
Warranty information can be found on my Facebook page which is also the best place to message me and make orders; second best is through here or call or text me at 5708027992. My Facebook is - https://www.facebook.com/frankscustomtransmissions/
PAYMENT OPTIONS- CREDIT/DEBIT, ZELLE, PAYPAL, CASHAPP
Stage 2 - Up to 500 RWHP based on a 4000 lb car or truck
New Frictions
New steels
All seals
29 element input sprag
Heavy duty sunshell
Corvette servo with band pin o-ringed at 4th oil -second servo and 4th servo . Greatly reduces leaks for 3-4 cutch oil at the pin to case area and 4th oil which I have found many times is quiet substantial. Also eliminates servo pin to servo leaks 2nd and 4th . (4 o-rings)
New Borg Pro series band
Resurfaced reverse input drum
6 friction 3-4 set with full thickness steels and custom made backing plate. Apply plate surfaced to be perfectly flat.
Custom shift kit with moderate firm shifts that are progressive to aggressive as throttle increases. (O-RINGED 4-3 AND CONVERTER REGULATOR VAVLE END CAPS ) (O-RINGED BORE PLUGS FWD/REV)
Full time overrun mod to protect sprag keeps overrun clutch on in all forward gears except actual 4th gear
Modified but not eliminated PWM circuit custom. (FIXES ISSUES WITH LEAKS (1870 CODE) AND INCREASES LOCKUP APPLY WITHOUT ELIMINATING PWM/PROGRESSIVE APPLY)
AFL valve reamed and replaced if needed after testing
Custom 2-3 shift valve not Sonnax for quicker upshifts on the 2-3
.500 boost valve set with PR set up for 200 psi max line based on factory tuning set up. Can go as high as 230psi with tune change to 99 percent max (all three lands o-ringed to prevent leaks ) (uses additional spring in boost valve to increase overall line without raising AFL)
New wiring harness and shift solenoids
New factory style pan with removable drain plug heavy duty not cheap tin.
New bushings throughout
(dual bushings in rear sungear)
This unit is suitable for every day driver with light to moderate performance and heavy duty use comes with a 1 year no-hassle warranty; its simple you break it Ill fix it. Just send it back.
PRICE = $2500 WHICH INCLUDES SHIPPING NO CORE REQUIRED TO ANY PLACE IN MAINLAND USA
Price is for 1993 TO 2006 4L60E YEAR FORWARD OF THAT PLEASE ASK FOR PRICE AS I HAVE TO CHECK PRICE AND CORE AVAILABILITY.
NO RETURN CORE REQUIRED
STAGE 3 - 4L60E BUILD UP TO 750 RWHP BASED ON A 4000LB CAR
New Frictions
New steels
All seals
29 element input sprag
Beast sunshell
Corvette servo with band pin o-ringed at 4th oil -second servo and 4th servo . Greatly reduces leaks for 3-4 cutch oil at the pin to case area and 4th oil which I have found many times is quiet substantial. Also eliminates servo pin to servo leaks 2nd and 4th . (4 o-rings)
Band /DRUM cooling mod sprays D4 oil into band gap to aid in keeping band and drum cooler . Particularly useful when in 4th at light throttle or low speed up/down 4th gear shifts at low line.
Billet Dual servo overdrive 4h
New black Raybestos Pro series band.
New reverse or reman input drum. (Actually prefer reman or turned stock drums as the new drums are actually thinner I have noted)
7 friction 3-4 set carbon alto with custom made thick backing plate and thick steels .090 . Apply plate surfaced to be perfectly flat (Note one or two steels may be .076 as drums vary but strive for .090) for better heat dissipation.
Custom shift kit with moderate firm shifts that are progressive to aggressive as throttle increases. (O-RINGED 4-3 AND CONVERTER REGULATOR VAVLE END CAPS ) (O-RINGED BORE PLUGS FWD/REV)
Full time overrun mod to protect sprag keeps overrun clutch on in all forward gears except actual 4th gear (Engine braking 1-2-3 gears even in OD position).
New valve body plate
Modified but not eliminated PWM circuit custom. (FIXES ISSUES WITH LEAKS (1870 CODE) AND INCREASES LOCKUP APPLY WITHOUT ELIMINATING PWM/PROGRESSIVE APPLY)
AFL valve reamed and replaced.
Custom 2-3 shift valve, not Sonnax, for quicker upshifts on the 2-3 (THIS MOD IS UNIQUE TO MY BUILD OR WAS BUT HAS BEEN USED AND COPIED BY OTHERS, (DRASTICALLY IMPROVES 2-3 COMAND TO SHIFT TIME)
.500 boost valve set with PR set up for 200 psi max line based on factory tuning set up. Can go as high as 230psi with tune change to 99 percent max (all three lands o-ringed to prevent leaks ) (uses additional spring in boost valve to increase overall line without raising AFL)
New wiring harness and shift solenoids
New factory style pan with removable drain plug heavy duty, not cheap tin.
New bushings throughout
(dual bushings in rear sungear) SLOTTED SUN GEAR FOR IMPROVED PLANET LUBE
Slotted fwd sun gear (INCREASES LUBE TO FRONT PLANET AND FLOWS MORE OIL INTO FRONT PLANET THEN SLUNG INTO 3-4 CLUTCH FOR SOME ADDED COOLING)
This unit is suitable for anything everyday driver to all out performance beaten on
PRICE = $2750 WHICH INCLUDES SHIPPING NO CORE REQUIRED TO ANY PLACE IN MAINLAND USA
Price is for 1993 TO 2006 4L60E, YEARS FORWARD OF THAT PLEASE ASK FOR PRICE AS I HAVE TO CHECK PRICE AND CORE AVAILABILITY. 700R4 ALSO AVAIABLE IN THIS BUILD CALL OR MESSAGE FOR PRICE.
NO RETURN CORE REQUIRED
STAGE 4 4L60E BUILD UP TO 900 RWHP BASED ON A 4000LB CAR
New Frictions
New steels
All seals
29 element input sprag
Collared input drum re-enforcement
Sonnax smart shell
Fairbanks superior 2nd gear servo machined for use with the Sonnax 4th servo for maximum hold in 2nd and quickest apply to 3rd gear with band pin o-ringed at 4th oil, second servo and 4th servo . Greatly reduces leaks for 3-4 cutch oil at the pin to case area and 4th oil which I have found many times is quiet substantial. Also eliminates servo pin to servo leaks 2nd and 4th . (4 o-rings)
Band /DRUM cooling mod sprays D4 oil into band gap to aid in keeping band and drum cooler . Particularly useful when in 4th at light throttle or low speed up/down 4th gear shifts at low line.
Billet Dual servo overdrive 4h
New wide band (RAYBESTOS PRO SERIES )
New reverse input drum.
8 friction 3-4 set carbon alto with custom made thick backing plate. Apply plate surfaced to be perfectly flat with specially modified steel plates to aid in cooling (Plates are .076)
Custom shift kit with moderate firm shifts that are progressive to aggressive as throttle increases. (O-RINGED 4-3 AND CONVERTER REGULATOR VAVLE END CAPS ) (O-RINGED BORE PLUGS FWD/REV) (NOTE THIS BUILD SHIFTS CONSIDERABLY MORE AGRESSIVELY THAN OTHER BUILDS.)
Full time overrun mod to protect sprag, keeps overrun clutch on in all forward gears except actual 4th gear (Engine braking 1-2-3 gears even in OD position.
New valve body plate
Modified but not eliminated PWM circuit custom.
AFL valve reamed and replaced if needed after testing
Custom 2-3 shift valve, not Sonnax for quicker upshifts on the 2-3 (THIS MOD IS UNIQUE TO MY BUILD OR WAS BUT HAS BEEN USED AND COPIED BY OTHERS, (DRASTICALLY IMPROVES 2-3 COMAND TO SHIFT TIME)
5 pinion GM ONLY planets (SOME HAVE ASK FOR 4 PINIONS INSTEAD AS SOME FEEL THEY ARE STRONGER AND ONGOING DISSCUSSION, I HAVE HAD NO ISSUES WITH EITHER, HOWEVER IF YOU PREFER 4 PINION PLEASE LET ME KNOW FOR A 200 DOLLAR PRICE REDUCTON.
.500 boost valve set with PR set up for 200 psi max line based on factory tuning set up. Can go as high as 230psi with tune change to 99 percent max
New wiring harness and shift solenoids
New factory style pan with removable drain plug heavy duty, not cheap tin.
New bushings throughout
(dual bushings in rear sungear) Also slotted for better lube to rear planets .
Slotted fwd sun gear (INCREASES LUBE TO FRONT PLANET AND FLOWS MORE OIL INTO FRONT PLANET THEN SLUNG INTO 3-4 CLUTCH FOR SOME ADDED COOLING)
PRICE = $3700 WHICH INCLUDES SHIPPING NO CORE REQUIRED TO ANY PLACE IN MAINLAND USA
Price is for 1993 TO 2006 4L60E. YEARS FORWARD OF THAT PLEASE ASK FOR PRICE AS I HAVE TO CHECK PRICE AND CORE AVAILABILITY. 700R4 ALSO AVAIABLE IN THIS BUILD CALL OR MESSAGE FOR PRICE.
NO RETURN CORE REQUIRED
(Other notes: it says custom for a reason, I make changes in the builds suitable to the application and sometimes well something different is a better choice (example a truck used for towing HD/ PERFORMANCE who orders a stage 3 might get a Sonnax second gear less aggressive servo as it would be more suitable. Also a truck used dual purpose might get 7 friction 3-4 with thicker steels for better cycling heat dissipation.)
(NOTE I HAVE TROUBLE OF LATE GETTING OLDER 1 PIECE CASE CORES. I WILL CHECK AVALABILITY FOR THESE AND THE 700R4 WHEN YOU CONTACT TO ORDER. IN SOME APPLICATIONS , I MAY SUGGEST USING THE LATER LT-1 STYLE BOLT ON BELL STYLE UNIT INSTEAD. WE CAN DISCUSS AT TIME OF ORDER.
Also note ALL SALES ARE FINAL . I hate to have to include this but I am a small one man shop and do not have room nor keep inventory and you may note my prices are considerably below others for similar even lesser builds. So when you place order and pay, I immediately order parts and core; at that point I am committed thus so are you.
Other CUSTOM SERVICES are available O-RINGED BAND PINS, O-RINGED BORE PLUGS. VALVE BODY AND PLATE BUILDS (You send me your valve body), CUSTOM SHIFT KITS, MODIFIED SUPERIOR SUPER SERVOS FOR USE WITH SONNAX DUAL OVERDRIVE SERVO. Message me for price.
I also do the 4L80E BUT ONLY AS A LOCAL DELIVERY/PICKUP IN BERWICK PA. IN ADDITION TH350-400-C6-AOD-AODE-4R70W-A727-A518 and some others local delivery pickup only. I do not supply or ship any of these units. Message for price.
Warranty information can be found on my Facebook page which is also the best place to message me and make orders; second best is through here or call or text me at 5708027992. My Facebook is - https://www.facebook.com/frankscustomtransmissions/
PAYMENT OPTIONS- CREDIT/DEBIT, ZELLE, PAYPAL, CASHAPP
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Last edited by FranksCustomTrans; Jan 29, 2026 at 02:01 PM. Reason: Couple typos
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Joined: Aug 2010
Posts: 7,320
Likes: 526
From: Ann Arbor, MI
Great products and pricing from our sponsor who answers so many technical questions here and shares so many tips.
Note: He labels them as Stage-1, 2 and 3, but should be considered Stage 2+, 3+ and 4+ when comparing them to other builds.
Note: He labels them as Stage-1, 2 and 3, but should be considered Stage 2+, 3+ and 4+ when comparing them to other builds.
Thread Starter
LS1Tech Sponsor
Joined: Mar 2023
Posts: 1,795
Likes: 1,138
From: BERWICK PA
Fixed the stages and added an actual stage 1 stock rebuild .
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook