89 gmc sierra screwed up while driving

Lots of stuff could be wrong, did you do normal maintainence to the vehicle? Did it start running ok again? Do you have a check engine light on? Give something to work with.

SOUNDS LIKE DRIVEFROM ENGININE TO TRANMISSION FAULTY

broken trans mount possibly doing that

best advise is to change they gear box completely

sounds like you may have coolant in your motor

ecm or pcm or both man does not sound good the fluid bothers me..

actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle

hi, this could point to one of a couple of things now the first and most obvious would be that the clutch needs replacing due to it being to low as this would indeed give you the problem your having.
Now the second problem could be that the nylon bushes on the gear selector could be worn and may need replacing, but if you can get all the other gears no problem then this is less likely so depending on how long ago the clutch was done i would think it could have gone and need replacing.

now if its a cable clutch their maybe some adjustment you could do at the gear box end you would need to see where the clutch cable goes into the gear box and see if their is the option of screwing a nut at the end of the cable that will allow you to take up some play on the clutch if their isnt any adjuster or you have fluid clutch then the chances are it will need replacing.

Let me know how you get on or if you need further assistance ok

do you beat this truck, four wheel alot, sounds like one of the axles is broke

My 2005 GMC 2500HD (8.1 lt) had the same problem. I just had an exhaust leak fixed today. The right front manifold bolts were broken and the manifold was warped. The repair was 6.5 hours labour plus gaskets, seals, bolts and the manifold machining (parts were $130 CDN).