3 4 clutch setup
Thread Starter
Teching In
Joined: Mar 2013
Posts: 14
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3 4 clutch setup I have borg warner 7 clutch 3-4 clutches. With my old snap ring I'm at .015, with new thinner snap ring I'm at .036. I'd rather keep it at .015 but there is not much movement during the air test. Not reusing boost springs. Opinions?
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Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
I assume you are talking about total clearance for the 3/4 clutch...
While a .015 clearance would work well on the track, IMO it won't last long on the street, at least not tens of thousands of miles. These tight frictions will wear in 1st/2nd gear when the clutch is not engaged. Very likely the frictions will quickly wear down to reach a more stable clearance. If you are determined to go with such tight clearance, I would recommend the boost strings.
Here is a combo I have listed several times:
7 Friction with GPZ105 (or BW HE):
.215 Apply
5x .066 Friction GPZ105 (or BW HE)
2x .079 Friction GPZ100 (or BW HE)
6x .098 Plain Steel
.145 Backing
.092 Snap ring (stock)
==> .045 dry clearance (.040 wet)
Note that the stock 4L65E 7-friction setup uses 7x .067 frictions for a .060 clearance. I find that a bit high and therefore use a few thicker frictions of the same brand to reduce the clearance to my desired level.
To have a .015 clearance with the stock snap ring, you must be running something thicker than than combo. What exactly are you running?
I discuss more of this issue in post #10 of this thread:
https://ls1tech.com/forums/automatic...n-problem.html
Again, I'm not an expert, but I have experimented a lot with the 3/4 clutch and have talked with many performance builders.
If you're up for spending an additional $500, the Sonnax Smart-Tech input drum is giving good results at 700+ HP. (And used by FLT's top-of-the-line Level 7):
https://ls1tech.com/forums/automatic...-4-clutch.html
While a .015 clearance would work well on the track, IMO it won't last long on the street, at least not tens of thousands of miles. These tight frictions will wear in 1st/2nd gear when the clutch is not engaged. Very likely the frictions will quickly wear down to reach a more stable clearance. If you are determined to go with such tight clearance, I would recommend the boost strings.
Here is a combo I have listed several times:
7 Friction with GPZ105 (or BW HE):
.215 Apply
5x .066 Friction GPZ105 (or BW HE)
2x .079 Friction GPZ100 (or BW HE)
6x .098 Plain Steel
.145 Backing
.092 Snap ring (stock)
==> .045 dry clearance (.040 wet)
Note that the stock 4L65E 7-friction setup uses 7x .067 frictions for a .060 clearance. I find that a bit high and therefore use a few thicker frictions of the same brand to reduce the clearance to my desired level.
To have a .015 clearance with the stock snap ring, you must be running something thicker than than combo. What exactly are you running?
I discuss more of this issue in post #10 of this thread:
https://ls1tech.com/forums/automatic...n-problem.html
Again, I'm not an expert, but I have experimented a lot with the 3/4 clutch and have talked with many performance builders.
If you're up for spending an additional $500, the Sonnax Smart-Tech input drum is giving good results at 700+ HP. (And used by FLT's top-of-the-line Level 7):
https://ls1tech.com/forums/automatic...-4-clutch.html
Thread Starter
Teching In
Joined: Mar 2013
Posts: 14
Likes: 0
Well, it would be helpful if I knew what I had. I don't have a 7 clutch, it's an 8.
.215 apply
3 .076 steel
4 .060 steel
8 BW hi frictions
.128 top plate
.62 new snap ring or old .92 snap ring
And no this is not for the track its a DD.
Thanks for the help.
.215 apply
3 .076 steel
4 .060 steel
8 BW hi frictions
.128 top plate
.62 new snap ring or old .92 snap ring
And no this is not for the track its a DD.
Thanks for the help.
