I recently aquired a 1988 GMC Sierra 4x4 and had a problem with the fuel gauge, i was working perfectly when i got the truck then 2 days ago it took a shit, i thought i was almost on E and went to fill up. Paid $29 in gas, which i new wasn't right for a fill-up, and it only put it a little over a quarter of a tank. So i know the guage isn't accurate and just tring to figure out what i should do first to try and fix it.

 

Also i forgot to add, my transmission is acting up, i've been told it could be a electonical issue being as it doesn't want to shift right sometimes, sometimes it shifts great, other times you have to stomp the gas to make it shift. Where should i start on looking to fix that? Its a 700R4 trans.

 

Check your tv cable , for the down shifting problems, but i think your gonna find out you got took.

 

The wiring on the gauge may be shot, or the float is screwed. The 700r4 trannies are junk. It may be time for a rebuild.

try us over at www.gmfullsize.com

 

It down shifts great its just normal shifting, it seems like when it warm it shifts great but when cold, not so great, but for the money i paid for the truck, i'm not complaining, the body, motor, transfer case and axles where at least worth that, the only thing i had to fix on the 4wd was the actuator which was expensive for as little as it was but still every thing else works great.

Ok thanks for the info, i figured it could be the float so that would probably be the first thing to replace being as it is as old as it is anyway. Yea i know they are i had one in my old 2wd 89 Cheyenne. I'll probably just replace it if it doesn't get better when i do a filter and fluid change on it. I have a feeling some of the problems with the tranny are probably because of non-maintance.