Is anybody running significant HP and torque through a stock 4L60E? I have the vette servo and will install a transgo shift kit. Any idea what the limit of this set-up is.
Oh, I have 3.42 rear gear. I'm thinkin of going with 3.73s. Any thoughts?

 

Not sure about trucks, but i can say i was putting down mid 500's on a shot and mid 10's in my trans-am with over 100k miles on a stock 4L60e with a deep pan and big cooler. Its a gamble, but if you drive it right and understand the limits of it then you can make a 60 live a good while. Lets be honest some folks can tear up anything... just use your head.

1. Keep it cool and change the fluid
2. avoid drastic downshifts...(rolling around 20-30 mph and slamming it to the floor, trans goes from a high gear all the way back to 1st) that force and inertia is hell on stock internals!!
3. plan on eventually building it.

 

My stock 60e is holding up very well. Shifts better than it did stock! I only have a vette servo. I'd be careful with installing a shift kit, sometimes they can be setup to shift way too firm and will cause hard parts to break

I'd say put the vette servo in, get a good custom tune, keep the fluid changed when needed and if going with a bigger stall upgrade your trans cooler

 

Jeteys5.3, I have the factory tranny cooler. I don't plan on installing a stall as of yet, do you think my factory transmission cooler will do? And yes, I will be getting a custom Dyno tune shortly.

 

Get the largest possible tranny cooler, usually a 40k, and run it along with your stock cooler. If anything in the tranny breaks, it wont be because of heat damage at least. I got mine from Oregon Performance http://www.oregonperformancetransmis.../LNG-4739.html

 

Drastic downshifts is my favorite passtime and my 60e/65e holds just fine 90 thousand miles and counting in a heavy truck.

 

That's impressive on a supercharged AWD!! How do you like the transgo shift kit?

 

My 60e in the tahoe grenaded the forward sprag at 62k miles, just a bolt-on truck..I looked at it as a good time to build it the right way. I also run the Transgo kit you need to make sure your shift pressures are stock and zero out your shift timing to disable adaptive learning.

 

yep yep... i have one and love it!!! cruising my trans stay at 120*... kickin it in the *** usually dont go above 150*!

 

im running a 60e with a vette servo, 3200 converter. i dont do that 4-1, 4-2 downshifts anymore thanks to Wheatley's input. plus my truck just spins if you flash the converter. i plan to go to a Performabuilt Level 2 soon. Skeet puts 500rwhp to a PB lvl 2. Truckshop runs a PB lvl 2 (420rwhp)
im about to swap to the 40k too, with a billet servo set up. i also run 4:10s bc it helps keeping the truck from being loaded too much.