turbocdubs

Okay so after about an hour of searching and looking around the forum ive found a few guys that have this issue. only problem is that they all have shift kits and what not.

My questions is what would cause a bone stock 4l60e to have a harsh 1-2 shift. it does it hot, cold or whatever. It is only part throttle too. Like if i floor it,it does fine but if I am just rolling around a parking lot or taking off from a light its a pretty harsh shift. the truck has 120k on it so I changed the fluid and did a new 1-2 accumulator piston. Bad news is it still does it. What should i look into next? dropping the valvebody?? or should i just say the hell with it and take it to a trans shop?

thanks

JordanH

iTrader: (16)

I've heard of some people taking it to the dealership and having them update the TCM with new software updates and it fixes them. I've had the same issue in my Tahoe, but I actually like it due to turbo I have on it. Makes a firm 1-2 shift in boost! but for normal driving it is very harsh...

terravast4

iTrader: (25)

if you scan a p1870 code this will command a hard 1-2 shift.. you will need a new valve body yours is worn

turbocdubs

i scanned no codes. current history or pending.. took it by the dealer this morning. pretty sure its something in the valve body. but i no official diagnosis yet.

goinbrokez28

iTrader: (1)

Please update when you find out. I have the exact same thing going on at part throttle. Will be heading to the dealer next week probably.

aEddin

Mine did this, only work done to the trans was a corvette servo (Start doing this a year or so after the install, not directly after). It got noticeable worst until it was so bad i would have to take off as slow as possible or it would spin tires, it was very bad in the rain, or traffic.

190k miles, cammed and put a stall in it, i changed the fluid and filter while in there. Transmission pan and fluid looked great but filter was clogged. Now it shifts soft only firm under throttle. I almost miss it, the shifts at part throttle are very "tame" now.

Try changing filter, and blowing out your cooler lines.
If that's not it then maybe it was a torque convert problem.

therock

iTrader: (2)

Sorry for the late post but I have been in your shoes.

Go Here

turbocdubs

If anyone has this issue, the 07.5-08 trucks have the 4l60e with the separate TCM and apparently have some tune gremlins.. reflashed this truck and its MUCH better now