Is this normal for an auto box?
Thread Starter
Pro
Joined: Nov 2017
Posts: 587
Likes: 49
From: Belgium
Is this normal for an auto box?
Hi guys!
I've been wondering a bit about my transmission :
When I'm cruising at 60 I'm doing 3500 rpm, when i let off the gas the revs almost instantly drop to 3.2K .
So it almost feels like my converter is still slipping 300 rpm.
When I'm cruising at 100 and I go full throttle it revs to 4K, like the converter is slipping again.
Is this normal? I've never driven auto's with this kind of power ( and this kind of freedom to play with them *laugh* )
Or what could the cause be? I do suspect the trans is overfilled atm (foaming => less 'pressure' in the converter causing it to slip?).
Specs:
Rebuilt th350 ( ALTO clutches, transgo street kit, 20-2.3K 10" stall converter JEGS 60402)
3.55 gears in the diff
No idea what hp the 350 engine makes - 0-100km/h is currently at 5.4s.
I've been wondering a bit about my transmission :
When I'm cruising at 60 I'm doing 3500 rpm, when i let off the gas the revs almost instantly drop to 3.2K .
So it almost feels like my converter is still slipping 300 rpm.
When I'm cruising at 100 and I go full throttle it revs to 4K, like the converter is slipping again.
Is this normal? I've never driven auto's with this kind of power ( and this kind of freedom to play with them *laugh* )
Or what could the cause be? I do suspect the trans is overfilled atm (foaming => less 'pressure' in the converter causing it to slip?).
Specs:
Rebuilt th350 ( ALTO clutches, transgo street kit, 20-2.3K 10" stall converter JEGS 60402)
3.55 gears in the diff
No idea what hp the 350 engine makes - 0-100km/h is currently at 5.4s.
Last edited by Dusky; May 16, 2019 at 03:03 AM.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Sounds like situation normal from what I read.....~300 rpm slip due to converter sounds normal to me.....
I have a 200 r4 trans in my '72, so lockup on the converter at speed, but a th350 does not have that option....
I have a 200 r4 trans in my '72, so lockup on the converter at speed, but a th350 does not have that option....
Drifting
Joined: Jun 2012
Posts: 1,990
Likes: 183
From: Port St. Lucie Fl
Are you checking the fluid with the engine running and warm after having been put in R,N,D,N,R,P for a few seconds each? Not doing so could give you a false reading.
Thread Starter
Pro
Joined: Nov 2017
Posts: 587
Likes: 49
From: Belgium
