There is a grinding noise coming from under my seat when i am going about 45+ it gets a lot worse on the highway and i need to figure this out. Both drive shaft u-joints are all brand new. and i looked under her for a bit and couldnt find anything loose or have any play. any input is much appreciated on what i should check next. TIA

(god i hope its not a bad tranny...)

 

Sounds like transfer case. Check your fluid and chain.

 

yepp....sounds like the TC mine does the same but at scceleration and if i grab the TC shifter and shake it it stops...

 

I'll check the TC fluid tmrw. It also shakes the entire jeep too, and it's coming from right under my seat. Would that make it something else?

 

TC fluid level is perfect, it's filled up to the bolt. It's shaking the seat the faster I go. What else do I need to look into? The grinding noise was gone today.

 

Does the steering wheel shake?

 

Yes it does a bit more than usual

 

a wheel needs to be balanced or the drive lines need to be re-balanced.

 

I'll try to looks into getting my wheels balanced but what do you mean drive lines rebalanced? Are you talking about Drive shafts?

 

Could it be a bad transmission mount? How would I go about checking to see if it's bad? I tried moving it with my legs but it wouldn't budge.

 

mine did it to its probably death wobble your ball joints could be bad or you could grease em a new steering stabilizer might help to but after i did ball joints all around it was fine

 

oh ya sorry. drive shafts i meant you know, the things with the u joints in them lol. if you take it to a drive shaft shop they can take them off and balance them for you. sometimes while wheeling the bricks of steel they use to balance them gets knocked off if you hit a rock or something.

 

ya and check all the joints and bushing you can....its amazing how a little piece of missing rubber can screw the hell out of your car.

 

I greased up the whole front end and it solved the steering wheel play. Still trying to solve the vibes now! Is there anything in the rear end that needs grease? I looked around while I had the grease gun out but couldnt see anything with a grease joint.

 

not unless you got shackles... but the rear end would really cause vibes i dont think.