Originally Posted by mikeSRusmc

I have a 2002 Chevy Avalanche 1500 4 wheel drive 5.3 L I cannot shift out of first gear no speedometer no cruise control have replaced ECM have replaced wiring harness from the ECM to the transfer case have replaced all three sensors on the transfer case have checked and replaced all my fuses replace the body control module replaced the speedometer instrument cluster and still I have no shift what could be the problem and how do I fix it

Originally Posted by silveradoman01

I really need some help!

I've got a problem with my trucks electronics regarding the tranny. The truck is a 2001 1500 4x4. My problem is that when I start off from a stop my tranny stays in first with the speedo at 0 and wont shift. Once it sits in 1st at 3000+ RPMs for a while it will slam into second and the speedo will shoot up to its reading then first gear again, second, first, second... All this time its changing from 1st to 2nd erradically as well as the speedo issue. Also accompanied with this problem is my ABS light along with abs activation under normal braking. The problem is 100% without a doubt electronic and has to do with my shifting, speedo, and abs. I've replaced the both VSS on my transfer case, had my tranny looked at by two shops, and had my ABS module refurbed all at a grand total of 700$. The last place was aamco which I hoped could read a code it might be throwing, those money hungry punks jumped straight to telling me its a mechanical issue and that I need to have the tranny dropped for 1000$. yeah of course it is.... I have a hunch that theres some more sensors im missing and could really use some help. Anyone who has the slightest input please reply, this is the third forum i've tried and im begining to loose my mind...lol. Thank you.