Uh.. I don't know if anything is wrong or not. I haven't been in any other automatic LS1 cars.. so this may be normal.

I have 3.73 gear....

So anyway .. when I'm starting up slowly .. like on a town street where the speed limit is 35-45 .. when the tranny gets ready to shift .. it kinda waits a second and then shifts hard..

its not like its SLIPPING i don't think .. but it just doesn't feel right. when i've got more throttle it shifts a lot smoother .. and at WOT its PERFECT.. but when i have little throttle .. its weird..

I don't know if i've explained it good enough .. but is this normal or is something wrong?

::Austin::
ps.. the only thing i have done that would have anything to do with this is 3.73 and hpp3.. no stall or anything

 

Hmmmmm... sounds VERY similar to the problem I was having. Only happens at feather throttle right?

Do you have an aftermarket MAF?

 

thats right. no i don't .. have stock maf. mods include:
Whisper Induction Lid
* Whisper Ram Air
* Hypertech Power Programmer III
* Flowtech 3" Exhuast Cutout
* Taylor Thundervolt 10mm Plug Wires
* NGK TR55 Plugs
* 1.5" drop [cut springs]
* Foglight blackouts

 

Have you increased the shift firmness at all with the hypertech?

Try putting the stock programming on and see if that changes it any.

I had the problem with my Granatelli unit. I took it off and the problem went away.