4l60E Separator Plate Holes
Thread Starter
Teching In
Joined: Feb 2025
Posts: 10
Likes: 2
4l60E Separator Plate Holes Hello All!
Firstly, thanks to everyone on this forum for the wealth of knowledge provided. I have a 99 Camaro that was a bolt on car plus nitrous last year. I had installed a HD2 kit and Sonnax 4th servo. This winter the car is getting ported heads, cam and an FTI 3200 converter. I decided to tackle some of the common issues with the 4l60e. I’ve added the following parts:
sonnax hd 3rd backing plate kit
7 friction high energy clutches in 3rd set to .025
7-cs spring kit with stock check ball
new bw high energy band
sonnax extra long o ringed servo pin
sonnax HD 2-3 valve
sonnax abuse bore plugs
trans go o ringed end plugs
blocked 4th accumulator
The car has 4.10 gears and needs to shift into 4th on nitrous. If this isn’t possible I understand and will adjust rear gear accordingly.
I'm stumped on what to drill my 3rd feed, BR, and 4th feed too. I’ve seen anywhere from .101 to .156, any suggestions?
Firstly, thanks to everyone on this forum for the wealth of knowledge provided. I have a 99 Camaro that was a bolt on car plus nitrous last year. I had installed a HD2 kit and Sonnax 4th servo. This winter the car is getting ported heads, cam and an FTI 3200 converter. I decided to tackle some of the common issues with the 4l60e. I’ve added the following parts:
sonnax hd 3rd backing plate kit
7 friction high energy clutches in 3rd set to .025
7-cs spring kit with stock check ball
new bw high energy band
sonnax extra long o ringed servo pin
sonnax HD 2-3 valve
sonnax abuse bore plugs
trans go o ringed end plugs
blocked 4th accumulator
The car has 4.10 gears and needs to shift into 4th on nitrous. If this isn’t possible I understand and will adjust rear gear accordingly.
I'm stumped on what to drill my 3rd feed, BR, and 4th feed too. I’ve seen anywhere from .101 to .156, any suggestions?
Thread Starter
Teching In
Joined: Feb 2025
Posts: 10
Likes: 2
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Let experts chime in, but I wonder if a wide band would be beneficial.(You didn't expressly mention that you had a wide band.)
I don't know if something like a "Super Hold" 4th servo piston is useful or just a gimmick, but I know that people towing with their trucks often want 4th gear upgrades.
I don't know if something like a "Super Hold" 4th servo piston is useful or just a gimmick, but I know that people towing with their trucks often want 4th gear upgrades.
LS1Tech Sponsor
Joined: Mar 2023
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From: BERWICK PA
Could have sworn I already did this but for a 4th shift at WOT
WIDE BAND on NEW DRUM, SONNAX DUAL 4TH SERVO, WELL SEALED BAND PIN, .110 SERVO FEED 4TH, BLOCKED 4TH ACCUM and still would suggest my band cooling mod and unless you plan to manual shift to 4th I would consider my overun mod.
But also consider the 3-4 must also hold this , So even though already applied make sure no leaks here and you will want 220- 230 or so max line during the shift.
(Secondary note- For towing and such the three best mods are wide band- sonnax servo- overun mod- band cooling mod.)
WIDE BAND on NEW DRUM, SONNAX DUAL 4TH SERVO, WELL SEALED BAND PIN, .110 SERVO FEED 4TH, BLOCKED 4TH ACCUM and still would suggest my band cooling mod and unless you plan to manual shift to 4th I would consider my overun mod.
But also consider the 3-4 must also hold this , So even though already applied make sure no leaks here and you will want 220- 230 or so max line during the shift.
(Secondary note- For towing and such the three best mods are wide band- sonnax servo- overun mod- band cooling mod.)
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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
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TECH Junkie
Joined: May 2012
Posts: 3,051
Likes: 716
From: Poplarville, MS
I think the car would be faster if you raze the shift points for 1st, 2nd, 3rd, 4th a few hundred rpms and then raze your rev limiter to 7200 or 7400 rpms than it would shifting into 4th just before the finish line.
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Teching In
Joined: Feb 2025
Posts: 10
Likes: 2
Could have sworn I already did this but for a 4th shift at WOT
WIDE BAND on NEW DRUM, SONNAX DUAL 4TH SERVO, WELL SEALED BAND PIN, .110 SERVO FEED 4TH, BLOCKED 4TH ACCUM and still would suggest my band cooling mod and unless you plan to manual shift to 4th I would consider my overun mod.
But also consider the 3-4 must also hold this , So even though already applied make sure no leaks here and you will want 220- 230 or so max line during the shift.
(Secondary note- For towing and such the three best mods are wide band- sonnax servo- overun mod- band cooling mod.)
WIDE BAND on NEW DRUM, SONNAX DUAL 4TH SERVO, WELL SEALED BAND PIN, .110 SERVO FEED 4TH, BLOCKED 4TH ACCUM and still would suggest my band cooling mod and unless you plan to manual shift to 4th I would consider my overun mod.
But also consider the 3-4 must also hold this , So even though already applied make sure no leaks here and you will want 220- 230 or so max line during the shift.
(Secondary note- For towing and such the three best mods are wide band- sonnax servo- overun mod- band cooling mod.)
Thread Starter
Teching In
Joined: Feb 2025
Posts: 10
Likes: 2
With the stock valve springs I was not interested in revving it that high. Aver the cam and heads going on I think you are right and that would cure needing to use 4th at the strip.
TECH Regular
Joined: Jan 2013
Posts: 463
Likes: 179
return or sell the sonnax HD 2-3 valve. you can actually achieve the same thing with a separator plate mod. I like Frank and/or maroonmonster 's method but sometimes customer might not want the firmer down shift it can cause. i should probably post how to do DIY method for HD 2-3 valve....
Thread Starter
Teching In
Joined: Feb 2025
Posts: 10
Likes: 2
return or sell the sonnax HD 2-3 valve. you can actually achieve the same thing with a separator plate mod. I like Frank and/or maroonmonster 's method but sometimes customer might not want the firmer down shift it can cause. i should probably post how to do DIY method for HD 2-3 valve....
TECH Regular
Joined: Jan 2013
Posts: 463
Likes: 179
allowing overruns in all gears with lever in "D", same as sonnax HD 2-3 valve:
block 35a and drill a new hole above 34e. this allows D3 oil (which is available in manual 1, 2 & 3) to feed the overruns. where as before D3 oil would be blocked by 2-3 shift valve when in 2nd (with lever in 3) and D2 oil blocked by manual shift valve when lever in 3rd lever not allowing overruns on in 1st & 2nd with lever in 3rd position.