Yellow Bullet Forums banner

1 - 7 of 7 Posts

·
Registered
Joined
·
11 Posts
Discussion Starter #1
I have a built TH400 in a 98 Trans AM turbo car. Pressure at idle in all gears is around 200-210psi (I think 3rd may have been a little lower).

With the trans brake applied it drops to 125psi in P, R and 1st. What could cause this?

I verified voltage when the brake is applied at the solenoid and its fully engeaged. Also checked and moved ground to frame. Fluid is Hygard.

Larry
 

·
Registered
Joined
·
11 Posts
Discussion Starter #3
pressure at idle
P,R,N,1,2. 210
3, 100

Pressure with Trans Brake engaged
R,N,1 125
2, 160
 

·
Super Moderator
Joined
·
19,570 Posts
So 3rd being a little lower has turned into half as much. Now you have a leak in 3rd. What is the trans doing or not doing? What do the pressures do at 2000 rpm?


Hutch
 

·
Registered
Joined
·
11 Posts
Discussion Starter #5
Trans was running fine but has been sitting for two months while I swapped k members and made a custom exhaust. Decided to check pressure before getting on the dyno. It did seem to take a lot more rpm to reverse but this is my first th400 and I assumed it was normal for a 4500 stall. Trans has less than 400 miles on it all street no track passes
 

·
Registered
Joined
·
11 Posts
Discussion Starter #6
Pressure seems to stay around the same psi at 2000. Maybe 5 more psi
 

·
Registered
Joined
·
11 Posts
Discussion Starter #7
Checked the valve for the brake as well as the servo cover, no leaks
 
1 - 7 of 7 Posts
Top