did 6 speed swap need some help..

[jb04rst]

i have a 2004 silverado rst that i recently swapped the original 5 speed with a tremec 6 speed and also chaned rear end gears from 3.73 to 4.56's. my problem is my speedometer is way off and i have the abs light coming on. can anyone give me some good advice on fixing this ??

[NEUMANNZZ]

you probably just need the computer adjusted for speedometer. not sure if you need a different speed sensor for the tranny.

[Pauly]

You need the PCM tuned for the gears of the trans and the rearend.

peace
PAuly