I have a 99 GMC sierra and one day it just stopped shifting into 1st and overdrive the 4wheel drive isn't even connected BC it took a crap so I need to know what could cause this

I have a 99 GMC sierra and one day it just stopped shifting into 1st and overdrive the 4wheel drive isn't even connected BC it took a crap so I need to know what could cause this 1 Answer

Ok I just bout a truck an 89 gmc Sierra and the guy didn't know what type of engine was in it all he could tell me was the fuel injected motor that was in it shot so he got it replaced and put a 350 edlebrook carborator. Ok we'll my actual question is how do I actually tell what kinda motor the guy had put in it 5 Answers

I really need to find this out

I have a 2005 gmc sierra 1500 4.3 v6. I get no kind of codes just going down the road and it die or start it up in the morning and it would just shut off. 2 Answers

I've changed the icm , the cps , plugs, wires, distributor cap and button. I've clean the throttle body. changed the serpentine belt and had the alternator tested. I've checked fuses. had the fuel pre...

I have a 2010 gmc sierra 4x4 1500 one the cooling lines rubbed a hole ine the other and it leaked fluid all over the bottom of my truck on the hwy and then i lost my gears 6 Answers

nThe truck will rev and the engine sounds good but wont go into reverseand intermittently into drive

1996 GMC Sierra club cab 4x4 just quit running when , I was driving it . Sounds rough when runs does not smoke. Was full of oil and transmition fluid, hard to tell where the sodd sound is coming from. Please help, do not have a lot of money! 1 Answer

1996 GMC 135,000 miles. Ran like a top 5.7 motor. truck just turned off while I was driving it. Odd sound can't tell where it coming from. Does not smoke, Does not seem like a rod gone out?