68RFE - Park / Drive / Park / Reverse / Hard Jerk

[Greasy24]

My 2015 68RFE has been rebuilt multiple times, and I have slowly replaced it piece by piece with billet.

I rebuilt it a few times, and a builder rebuilt it the last two times.

I have a hard jerk after it has been idle for a while, and some random times, it will jerk park to reverse or park to drive, or if I have to turn around in a tight area, park to drive to reverse to drive a couple of times.

The first time builder rebuilt it, I was having issues using all the 2C and 4C clutch packs from a short shift and short lockup tranny lockup were perfect for me but clutch material would come off after maybe six months due to truck weight and heavy foot.

So the builder popped in a few parts to add more space for more clutches, and I told him not to use GPZ clutches because there was junk and changed accumulator springs to keep it out of lockup longer lockup the clutches so he wouldn't have to keep rebuilding it.

So now 2nd to 3rd takes forever to lock up, and like I said, the hard shifts park-reverse-drive.

Would scars made in the overdrive drum cause these hard shifts between gears?

He sent me a picture last time of a broken drum he had just put in the first rebuild that he replaced the 2nd build because it was damaged; would this cause the issue.

Also, what is a good accumulator spring kit to get my power back?

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[Greasy24]

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[Chrisn162001]

The wear on the drum looks like where the reverse reaction plate sits.

That wear is acceptable.

You might take a file and smooth it out if it looks like the plate could hang up on it.

I don’t know what springs he would change in the accumulators; the ones that come in Transgo shift kits are just replacements for worn springs.

There are no updated or heavier springs to my knowledge.

The hard shifts are likely clearances set wrong.

Or GPZ that have compressed over time if they were used.


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[Chrisn162001]

Has the pump and valve body been upgraded?


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[Chrisn162001]

One more thing on the 2c 4c issues.

Are you running a revmax billet center support?

They had a batch of miss drilled fluid ports on their center supports about a year or so ago.

The few I saw would still seal, but other builders had some that were off.


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