chevrolet all the way

iTrader: (24)

odd. same if you crank it right up and throw it into gear? fluid all look good?

whippled 8.1l build

tryed both starting it up and tossing in gear and letting it warm up.. same result

chevrolet all the way

iTrader: (24)

what about the fluid?

whippled 8.1l build

fluid looks great but i think the next thing im gonna try is replacing both filters.. no idea when the last person did it or if they ever did

chevrolet all the way

iTrader: (24)

sounds kind of weird. i havent been doing work with the allison stuff long so i dont know all the tricks yet. do you have a way to scan the tcm to watch what its doing?

whippled 8.1l build

gonna be doing that this weekend.. buddy is bringing his snap-on scanner down

richardkmolina

i have an 02 Chevy 2500hd with 8.1l and Allison 1000 tranny and is has a late shift 3000rpm shifts all the time win in drive also tow mode don't work light comes on but nothing happens.
i have codes pending
p1688
p0342
p0700
i tried clearing them and they come right back
truck don't have kick down and win coming to a stop it has a hard shift like its going from 5th gear to 1st gear and wants to push the truck forward.

my mods are
Howells aftermarket 8.1l wiring harness
new T.A.C part number 12588923 03-04
new throttle body 03-04
new throttle petal sensor 03-04
new custom tune pcm from nelson performances. blue and green plugs
all new sensors on motor and getting new soon in the mail for tranny.
any ideas on what maybe causing the codes and the tranny to act like that ???

richardkmolina

did you fix your problem and if you did what was it

richardkmolina

did you fix your truck