87 banshee

ok well let us know, and take more pictures of it if you can.
when checking it out, make sure to check the bearing, banshees are known for going through swingarm and carrier bearings. also check your tie rod ends and ball joints.
 
I had a 87' they got the upper J arms instead of A arms. Mine had bump steer bad and couldnt keep up with my buddys on the trail. unless your a dune rider i wouldnt do it. especially with a tranny problem that can be expensive. just my opinion though do what you want but THE J ARMS SUCK
 
lots of people trail ride j-arms. they are just not the best for jumping or hardcore racing.
a buddy i ride with had a nice j-arm shee, it would keep up with my a-arm one easily.
like any banshee, it will need some shocks to make it ride good in the trails. and my guess, the tranny problem is maybe a cracked neutral cover or the screw holding the shifter star isn't seated correctly.