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-   -   3-4 pack clearance (https://www.thirdgen.org/forums/transmissions-drivetrain/753737-3-4-pack-clearance.html)

rottweiler68 06-07-2018 09:07 AM
3-4 pack clearance
 
When the stack is complete, where is the exact spot to measure total clearance? From the videos I've seen it looks like it's being measured between the last friction put in and the top plate that sits under the snap ring? Also, I'm at .065 in that spot right now, and all spins freely but just seems a bit to much play up and down.

I'm thinking, if that is the correct way to measure that I'm doing it, about getting the clearance to around .040

Any advice would be great!!!

Thank you.

Pro Built Automatics 06-07-2018 01:44 PM
Re: 3-4 pack clearance
 
When checking clutch clearance, do it between the snap ring and pressure plate. When using the Corvette servo, set the 3-4 clutch clearance at .035" - .055". You can change a steel here for a thicker one if needed to get the required clearance. Set the band clearance at the minimum if you can.

rottweiler68 06-07-2018 01:46 PM
Re: 3-4 pack clearance
 
Originally Posted by Pro Built Automatics (Post 6227387)
When checking clutch clearance, do it between the snap ring and pressure plate. When using the Corvette servo, set the 3-4 clutch clearance at .035" - .055". You can change a steel here for a thicker one if needed to get the required clearance. Set the band clearance at the minimum if you can.
Perfect, that's exactly what I needed. Thank you Dana!

rottweiler68 06-07-2018 02:08 PM
Re: 3-4 pack clearance
 
One more thing I forgot to ask is that my ‘87 700r4 didn’t come with the 3-4 boost springs installed as I believe they were added In later years, yet my rebuild kit did. Should I put them in or leave them out? I see people using both ways and the ATSG says to leave them out.

Pro Built Automatics 06-08-2018 01:03 PM
Re: 3-4 pack clearance
 
If you are using the original clutch count and pressure plates, use the boost springs. Make sure the 2-3 feed hole on the separator plate is a minimum of .093" or .110" is much better. Main boost valve should be .471", and the intermediate/reverse boost valve .282" at a minimum. 2nd gear feed .076" - .082". 4th gear feed .110" - .125". Flip 4th accumulator piston and spring over to get a better 4th gear shift.

rottweiler68 06-08-2018 01:09 PM
Re: 3-4 pack clearance
 
Originally Posted by Pro Built Automatics (Post 6227605)
If you are using the original clutch count and pressure plates, use the boost springs. Make sure the 2-3 feed hole on the separator plate is a minimum of .093" or .110" is much better. Main boost valve should be .471", and the intermediate/reverse boost valve .282" at a minimum. 2nd gear feed .076" - .082". 4th gear feed .110" - .125". Flip 4th accumulator piston and spring over to get a better 4th gear shift.
Ok thanks! I'm not using the stock setup on clutches (using the 7 friction setup) or plates so I will leave them out.

Pro Built Automatics 06-10-2018 01:33 PM
Re: 3-4 pack clearance
 
What rpm is this going to see at WOT? If you are not going to use the boost springs, then add the TransGo 7-CS and install all of the springs, do not leave any out. This is the way I have done it since 1994 and have never had a problem with clutch life.


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