I'm having shifting problems between 1st and 2nd gear it shifts back and forth between the two anyone have any idea? Also when I'm on the throttle hard the tranny won't shift out of 3rd into 4th. I have to let off the throttle to get it to shift. please help.

2005 Cummins Ats tc, and ats valvebody, 4" superlift, 35" bfgs, Edge juice w/attitude, quadzilla boost fooler, afe stg 2, 4" straight pipe.

 

I would be calling ATS. Did this just start or did you just get the truck? Sounds like an adjustment needed in the valve body. I just finished mine today and I know that the shift kit I bought had a spring included that would make the upshifts later at WOT.

 

since u have ats ya call them, that happeneds to mine to every once in a great while....but im do for an adjustment on my tranny!

 

I had the ats tc installed about 2 months ago, and the valvebody about a month ago. should I take it back to the diesel shop that installed the two or just call ats? thanks for the help.

 

is the back and forth shifts between 1 and 2 at light throttle in a parking lot mine does sometime

 

yeah at light throttle or pulling a load, but if i give it throttle its fine. Do you know what that is about.

 

It sounds like the governor pressure solenoid is bad when it wont shift at full throttle. I was looking at the fix for that on the PATC transmissions site. Its a peice of metal (billet?) that holds a governor pressure solenoid from an Allison. Its supposed to fix the full throttle no upshift on modified transmissions. Check it out. Id give you a link but Im not that savvy.

 

bump

 

I have question, I am getting my tranny rebuilt next week and I was was wanting to know which billet shafts I should put in. I already have the Ats tc and valvebody, and my goal is to have around 600-650 hp to the tires. So do I really need to do all three shafts?

 

no intermediate shaft should be fine, and a lot of people don't use billet output shafts and just call it good with a sonnax billet input, i have everything billet in my trans, except the flex plate which i plan on upgrading here very shortly