TH400 1 - 2 shift problem
Thread Starter
Burning Brakes
Joined: Nov 2005
Posts: 1,137
Likes: 51
From: Cartersville GA
TH400 1 - 2 shift problem
I'm getting a shift problem from 1st-2nd gear (upshift), more prominent after cruizing for a while when the trans is good and hot. I rebuilt the trans a few years ago, used hi-po disks and plates, stock valve body. This was the third one I rebuilt, other two never had any problems until they flat wore out.
This one sat dry for a while. Here is what I have tried so far to remedy the problem. I replaced all rubber vacuum lines to the modulator, replaced the modulator, added trans x and ran 200 miles, drained, replaced filter and refilled.
I took it to a dealership, and they said everything was fine and that the pressures looked good. Of course, as usual, it doesn't do it when you have them in the car. Plus, like I said, the longer driven, the worse it seems to be.
Sounds like a slight grind or pop when accelerating heavily. I spoke to a mechanic friend, who thought it might be the accumulator. Right now I am taking it VERY easy when driving during 1-2 shift. 2-3 shifts fine.
Any suggestions???
This one sat dry for a while. Here is what I have tried so far to remedy the problem. I replaced all rubber vacuum lines to the modulator, replaced the modulator, added trans x and ran 200 miles, drained, replaced filter and refilled.
I took it to a dealership, and they said everything was fine and that the pressures looked good. Of course, as usual, it doesn't do it when you have them in the car. Plus, like I said, the longer driven, the worse it seems to be.
Sounds like a slight grind or pop when accelerating heavily. I spoke to a mechanic friend, who thought it might be the accumulator. Right now I am taking it VERY easy when driving during 1-2 shift. 2-3 shifts fine.
Any suggestions???
