i just picked up a 92 4.0 5 speed for $2,000. its got 190,000 miles on with almost no rust at all. the motor seems to run great, but the tranny is giving me some issues. let me first say I know almost nothing about mechanics, but I am trying to learn and am very good at figuring things out. reverse grinds everytime, and shifting to third or fourth will grind sometimes. and downshifting to fourth or third will grind everytime. i've heard of synchromesh, do you guys think that might save it?...also, it makes a strange noise when i turn the wheel almost the whole way when im parking or backing out of a parking spot. the noise is similiar as if it would be in 4wd but its not and drives and turns smoothly otherwise. another thing i hear sometimes is a thumping noise that i think is coming from the back left, i only ever hear it when im at an idle or slowing down. what could that be?...the exhaust?? any suggestions would be great and i'm trying to learn how to do some of this stuff myself. i have friends with experience if i ever run into issues and my dads garage has about any tool i'll ever need. i just need a little advice what i should do with this thing. what would be some good things to tune it up a bit....i also noticed it is TERRIBLE on gas and burns a little oil. thanks guys I am lookin forward to start my jeepin!