I have a 4L65E in an 2002 GMC Sierra Denali. It is AWD. It has LT headers and a moderate cam. Basically stock motor everywhere else. NO forced induction NO nitrous ever.
I have had the trans built 3 times and it has failed each time. I have a yank TT3000, superior shiftkit, beast shell, wide bands, a hardened input shaft, corvette servo, 30K GVW cooler, ect.
What is the problem? What trans or other would you recommend? I have seen much more truck running reliably on the same or less transmission.

Extended interstate drives (4-8 hours) happen on occasion and have been where I have seen the failures. Transmission temps remained at ~180*F.

 

what kinda failure are you seeing? Burnt clutches or total failures with complete loss?

Give performabuilt ot FLT a call, they will hook u up right.

Truck is tuned I'm guessing?

 

i dont think local shops can build a 4l65e muchless a 4l60e like performabuilt or flt, i went through 3 shops before i said fug it time to spend the dollars and get it done right!!


i personally dont think they can do the machining to help fluid flow like these guys can.. glad i went with performabuilt!!!!

 

Thanks for the input. It was tuned. The fluid flow is another possibility here. hmm. Band broke initially, Then input drum and then TC, now TC??? Clutches??? 3 and OD went first but worked fine when the TC locked...? Then lost all gears.

I know FLT. Who is Performabuilt? Where are they? Reputation?

 

Several guys on here use Performabuilt, and never heard a bad thing about them.. Last i saw they were including Trans Cooler and other small goodies in the deal?

 

Unfortunately I have heard this same story repeated over the years. The guys at FLT really cater to us truck guys and build a transmission designed to take the abuse and drive the weight of our trucks, your Denali is no lightweight!
Give the guys at FLT call in the morning, you won't be disapointed.

 

I have talked to both Chuck at FLT and Frank at Performabuilt. I am undecided right now but I would like to get my current trans redone by one of them since I already have several parts (beast shell, vetteservo, shiftkit, widebands, hardened input shaft). I will wait until tomorrow, when it is pulled, to see the extent of the damage. If it is just the 3-4 clutches as I think then I will try toget it redone instead of using it as a core.

Chuck recommends his L5 (4l65E as is already in it). Frank said I could get by with his level 2 (4l60E).
Any thoughts???

 

My personal experience says FLT Lv 5 is not going to give you any headaches.

 

Even if it is just a 3-4 pack. I would have one of those guys completely rebuild it for you. It's all in the little tricks they do and there attention to detial that sets them apart from your average Tranny shop...

 

I didn't plan for the tranny shop to build it this time. I want them to send it off. I just don't want it "fixed" again.