6hp26 torque converter lockup

btmfuturesho · May 17, 2016

Here's a question I'm hoping Phil can answer, or anyone with tranny experience.

My 6hp26 had 3-4 shift issues in the past. Took it to "Mr Transmission" (big mistake) and they *rebuilt* my torque converter amongst other things.

When I got it back from them I noticed some funny behaviour of the torque converter.

When it switches to *regulated* before *lockup* I would notice the RPM fluctuating a little bit. However, it was still going into lockup and holding rpm tight.

This went on for a while until it quit locking up. So currently, after 2mins of driving, it throws a code for torque converter clutch performance.

I have 2 valve bodies, so I swapped my old one in, and it does the exact same thing.

Does this mean the torque converter clutches are done? Time for a new torque converter? Anything other than valve body that can affect TC lockup?

After my torque converter was apparently "rebuilt" I found out the 6hp26 TC uses a captive clutch setup, which is apparently impossible to rebuilt. Does this make sense?

Thx

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RRPhil · May 17, 2016

As I’ve said many times on here, rebuilding the ZF converter is a specialist task because the lock-up clutch piston retainer is friction welded to the centre tower and, as the piston movement from off to on is so small, it has to be re-welded very accurately back into position once the friction plate has been replaced.

I suspect that a lot of TC rebuilders, once they get this particular converter apart, take one look at this arrangement and decide not to bother replacing the lock-up clutch.

Phil

btmfuturesho · May 17, 2016

In your opinion, that's likely my issue? With the code my RR is throwing? And not likely an internal tranny problem?

Don't want to buy a TC for nothing.

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6hp26 torque converter lockup

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