Thread: 4t65e HD Rebuild (Question is for Trannyman95 or any other Tranny GURU)

I was just happy posts weren't disappearing like clubgp

LOL I feel ya on that note!

I've noticed in my trans it occasionally shudders in drive when I take off. It almost feels like wheel hop but I'm convinced its the trans. Trans has 70k on it right now and it happens probably less than 5% of the time. It occurs most often at like 30% or so of take off power. If I mash the gas it just breaks the tires loose. But if I decide to accelerate a bit quick it does this.

What are the likely areas of concern. I have a wbody shift kit with DHP 1.5 bin file which is currently not been modified. I have a snap on scanner so I can read a bunch of trans data if necessary. No trans codes as of right now.

So I was going through my ATSG update book and it mentions the PCS is likely the culprit which I've heard is notorious for going bad in our trans.

Trannyman

It says in the update book that prior to installation, you should turn the New Desgin PCS (OEM # 10478146) adjusting screw an 1/8 turn, as well as installing the Boost valve sleeve kit (Sonnax #84754-30k). Do you typically turn the adjusting screw in the new PCS or do you just install the new one along with the boost sleeve kit.

Yeah those two parts are the most common causes. The solenoid has a pretty bad track record and will cause low pressure if acting up. Turning in the screw as mentioned in your book will slightly raise pressure but not much, but can be enough to help cover up other potential problems. I use Borg Warner style pressure control solenoids which look completely different and I havent had any trouble with those to date. The also have the adjustment screw which is peened really tight and I dont adjust them during my builds but you could turn it in if just replacing a bad old solenoid.