work in progress

iTrader: (2)

Im trying to help a friend that is having an issue with the 1-2 shift. The truck shifted fine until he made a pulley change and installed a Yank sc 3000. The truck is 2010 z71 with a 6l80. The truck falls on its face pulling fuel when shiting to 2nd, once it shifts it runs like a raped ape. The truck was tuned at LMR and they are scratching thier heads trying to figure out the problem. Any help would be greatly appreciated!

gs7793

iTrader: (8)

it sounds like what happens to my truck when i manually shift into 1st doing a 40 punch, and then if i hit the rev limiter if falls on its face and takes about 2 seconds to shift into second....is he hitting the rev limiter maybe?? just a thought..

MikeGyver

iTrader: (5)

The same thought that popped into my head.

work in progress

iTrader: (2)

no he isnt hitting the rev limiter. All of TM is turned off, but it will flat out fall on its face until the shift and then run hard. They had a hard time getting the converter to lockup until a tech for yank lined them out, but then this problem started. LMR is saying it an HP tuner probelm.