Transmission Help 700R4
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Intermediate
Joined: Jun 2007
Posts: 33
Likes: 0
From: Winnipeg Manitoba
Transmission Help 700R4
i have a 1990 automatic with the 700r4, My engine builder has said that the trans was burnt and I need to rebuild or replace it. Any suggestions on what stall to put in? the l98 will be modified somewhat and it is only a weekend driver
Advanced
Joined: Dec 2007
Posts: 77
Likes: 0
From: O Fallon IL
factory 700r4's are crap! I did a lot of work and a lot of searching online.... if your pump is going than its best to replace the whole thing (as the pump uses the walls from the casing itself- once worn the case must be replaced- not a basic rebuild step)
my best advice is to buy replacement rebuild kits that also include "fix" parts, or parts that correct issues that they've found since the 700 came out- save you time and mess later on- also an inline external cooler will make her last longer- from what I hear, 350hp is its limit at the motor.... I shoot about 350ish into her now and I'm on my 3rd rebuild in the last year (worn pump casing and cheap clutches w/no valve body goodies- this time I'm doing it right
found good kits and packages here (at least ideas for parts- some I found elsewhere for cheaper)
http://www.transmissioncenter.net/highperf700r4.htm
I would also upgrade some of the valve body springs along with the bigger t/v valve (stronger shifts and less wear to the clutches)
With these having the lock-up feature, you really don't need a higher stall than stock, but thats up to how you wanna drive it- weekends only may mean you're not too worried about gas- a 200-2500 wouldn be terrible but not too necessary
my best advice is to buy replacement rebuild kits that also include "fix" parts, or parts that correct issues that they've found since the 700 came out- save you time and mess later on- also an inline external cooler will make her last longer- from what I hear, 350hp is its limit at the motor.... I shoot about 350ish into her now and I'm on my 3rd rebuild in the last year (worn pump casing and cheap clutches w/no valve body goodies- this time I'm doing it right
found good kits and packages here (at least ideas for parts- some I found elsewhere for cheaper)
http://www.transmissioncenter.net/highperf700r4.htm
I would also upgrade some of the valve body springs along with the bigger t/v valve (stronger shifts and less wear to the clutches)
With these having the lock-up feature, you really don't need a higher stall than stock, but thats up to how you wanna drive it- weekends only may mean you're not too worried about gas- a 200-2500 wouldn be terrible but not too necessary
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
trans
fwiw I would just run the trans till it fails. If your trans works ok now, it might take 2 years to fail.
I would change ALL the fluid and filter, and see how it goes.
I would change ALL the fluid and filter, and see how it goes.
