TH400 line pressure???
Thread Starter
Teching In
Joined: Feb 2013
Posts: 33
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From: London, KY
TH400 line pressure??? I just got my truck running again tonight since building the trans back. I took it for a drive tonight and my pressure gauge is hitting between 300-320 psi. This is a TH400 with a Jake's stage 2 kit, 4000 stall converter, TCI rmvb w/ transbrake, 5 forward-6 direct-4 intermediate. Clutch pack clearances checked and good. Intermediate support and heavy snap ring. I used the boost valve from Jakes kit and the TCI spring. My question is....for a primarily race only 3700lb truck, is the pressure to high? I've read where most advise against anything over 200-250psi but have also read some that say 300psi is fine for racing. Am I going to wipe out the thrust bearings in my LQ9? Thanks
I just got my truck running again tonight since building the trans back. I took it for a drive tonight and my pressure gauge is hitting between 300-320 psi. This is a TH400 with a Jake's stage 2 kit, 4000 stall converter, TCI rmvb w/ transbrake, 5 forward-6 direct-4 intermediate. Clutch pack clearances checked and good. Intermediate support and heavy snap ring. I used the boost valve from Jakes kit and the TCI spring. My question is....for a primarily race only 3700lb truck, is the pressure to high? I've read where most advise against anything over 200-250psi but have also read some that say 300psi is fine for racing. Am I going to wipe out the thrust bearings in my LQ9? Thanks
Ditch the TCI spring, use what we provided and your pressures won't kill the pump and engine thrust.
Thread Starter
Teching In
Joined: Feb 2013
Posts: 33
Likes: 0
From: London, KY
I was kind of torn on which way to go when I assembled the pump. The old pump had to be replaced. The boost valve didnt look so hot in the new TCI pump so I used the one out of the kit. I was reading the tips on the papers sent with the rebuild kit and it recommended using the spring that came with valve body originally which is a RMVB TCI transbrake unit. I guess I will pull it back out when the ladder bars go in and put the softer spring in.
