Solid liners vs grooved liners

Using solid liners verses grooved liners in CD4E.

I sometimes would receive a call that would go something like this: ‘I have installed a rebuilt transmission and your converter. The problem my customer has is when he goes to accelerate, and the converter is in lock-up, the converter clutch slips.’

As stated in Sonnax Transmission Specialties Catalog, the CD4E valve body develops varied complaints depending on the amount and locations of valve bore wear.

After reading the corrections for the excessive wear, I have come to the conclusion that many of the repairs are too technically advanced for many of the shops to perform. Shops that are not able to do this are left with three choices: one, buy a new valve body; two, find a good used one; or three, reuse the one they have. I have found a way to help reduce this problem. That is to remove the grooved lining. Then bond a .070 solid lining in its place. Doing this isolates the converter apply pressure from pulse modulation control. Therefore, reducing the chance of converter clutch spin up.
-Howard Johnson,
Salt Lake City, Utah

As a follow up to Howard Johnson’s article, the TCRA newsletter decided to make some inquiries about this interesting problem.
After talking to several repair facilities, it appears many of them are using the solid clutch method Howard speaks of instead of the embossed constant slip type liner. This does appear to correct the problem on the CD4E.

We have also found that this solution works well on the late model AXOD and AX4N torque converters. By restricting the flow of fluid past the piston or clutch liner, you are retaining more oil for clutch apply thus less slippage.

We will continue to investigate this practice of repair, and let you know if any positive or negative results are retained.

Found in issue 05, 2003.