So I lost third gear in my denali and decided i could do the rebuild myself.

I used this kit:TT4L65E-RBRBK20042008ST1 - Street/Strip up to 550 HP
link https://www.trutechtrans.com/TT4L65E...T1-Basket.html

I also installed a corvette servo and a pinless 1-2 accum.

The rebuild went ok i guess. I did wreck one seal but replaced it.

Been driving it for about 3 months and still slams in to second most of the time. If im pulling my camper-6800lbs- shifts perfect nice and smooth. but when empty it slams in to second unless i really baby it.

Was wondering if that was normal for a corvette servo. or maybe a the 1-2 accumulator?

 

Have you spoke with tru tech about it? They have a number you can call.

Was the tune ever modified in the vehicle or is it stock?

 

stock tune, only mod is catback..

 

I would say accumulator set up issue. Not sure why they use the wide carbon band. We only use those for 750hp+ applications. What size boost valve did it come with?

 

My FLT 7 hits pretty hard on the 1-2 shift.after that its smooth

 

not sure. think ill drop the accum and check it out. maybe go back to stock.

thanks for the input.