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Frank’s Custom Transmissions’ Tips, Tricks, Mods for the 4L60E Shift Improvement Kit

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Old Oct 16, 2025 | 06:00 PM
  #21  
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SHIFT KIT INSTRUCTIONS 2
iNSTALL SUPPLIED BOOST VALVE should have spring in valve  note assembly is main PR-TWO STOCK SPRINGS AND THE BOOST VALVE ASSEMBLY. MAKE SURE CLIP FULLY INSERTED. BOOST VAVE WILL TAKE SOME EFFORT TO PUSH INTO  PLACE.
iNSTALL SUPPLIED BOOST VALVE should have spring in valve note assembly is main PR-TWO STOCK SPRINGS AND THE BOOST VALVE ASSEMBLY. MAKE SURE CLIP FULLY INSERTED. BOOST VAVE WILL TAKE SOME EFFORT TO PUSH INTO PLACE.

You are done with VB part.

Next remve servo assemby If FBODY , VET,GTO, IMPALA SS .you already have corvette servo. So just remove and install new pin . then best to carefull remove remove all outer servo assembly rings and the two on new pin carfully. Now if using stock 4th servo flip 4th servo and put assmebly back together and with spring in bore insert assembly and try to install clip while pressing in firmly . if you can install then with pry bar push in on servo cover if it moves but no more than the thickness of the clip then simply turn output shaft with trans in any gear but part by hand its not easy but should not require pliers either in both directions, it will be harder in one than the other, You will likley hear a sqeeky sound that normal the you are good, Remove the assembly install the rings on sero and on pim grease up install and place clip in you are good and yes leave 4th servo flipped.
If clip will not go in or will out shaft wil not turn . Remove grind about 1/8 inch from inside end of pin and try again till you acomplish above and them do final instalation making sure clip is fully inserted and gap in the 10 oclock positon.

Ideally if building do the servo before pump with trans upright, The goal is the band as close as possible with no drag on drum .

Thats all The reson for removing the rings from the pin during set up is a sharpe edge happens to back side of bore from wear and will tear rings sometimes on removal but not insertion of pin . If by change you make that mistake HARBOR FREIGHT has the orings inthe green or brown set both suitable.

I plan much more novice detailed instructions in the future. But for now all all is assumed a basic understanding of the unit.


[img alt="How stack up gaps should look when servo stacked space between center stands and cap no matter what cap should be no more than 1/16th inch . If sitting on top try adding a 1/16th easher between 4th servo and pin if opens to less than a1/16th gap good If opens to more than 1/16 then remove washer and assemble as is. Note the sonnax 4th servo requires a washer between servo abd pin. You can get several thickness in grade 8 or 10 at hardware store , Size is 3/8th. With sonnax must be grade 8
"]https://cimg4.ibsrv.net/gimg/ls1tech.com-vbulletin/940x2000/stack_up_8c8fedf8622d97d2c9c5a10d8808358c379f71f3. jpg[/img]
How stack up gaps should look when servo stacked space between center stands and cap no matter what cap should be no more than 1/16th inch . If sitting on top try adding a 1/16th easher between 4th servo and pin if opens to less than a1/16th gap good If opens to more than 1/16 then remove washer and assemble as is. Note the sonnax 4th servo requires a washer between servo abd pin. You can get several thickness in grade 8 or 10 at hardware store , Size is 3/8th. With sonnax must be grade 8
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Old Oct 16, 2025 | 09:47 PM
  #22  
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[img alt="With stock or the sonnax or any 4th servo when stacked you should have between none and about 1/16th inch of gap between the cover and center peice but the actual servo being in contact or within 1/16th of the pin .
With the stck stock 4th servo ussually just flipping the servo will do this, However if needed you can add a washer of whatever thickness needed to get this and type will do they are 3/8 in size and various thickness can be had at the hardware store. Same is true of all other servos "]https://cimg2.ibsrv.net/gimg/ls1tech.com-vbulletin/940x2000/stack_up_2188a901e00e0ba7fbf73ecc6f2123561acf75b7. jpg[/img]
With stock or the sonnax or any 4th servo when stacked you should have between none and about 1/16th inch of gap between the cover and center peice but the actual servo being in contact or within 1/16th of the pin . With the stck stock 4th servo ussually just flipping the servo will do this, However if needed you can add a washer of whatever thickness needed to get this and type will do they are 3/8 in size and various thickness can be had at the hardware store. Same is true of all other servos.

NOTE- SUPERIOR SECOND SERVO WILL NOT WORK WITH SONNAX OR SIMILAR FLAT BOTTOM 4TH SERVOS WITHOUT MACHINING

Again I will work on making these instructions better in coming days

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