i just purchased a 87 samurai it runs and sounds good but if you rev the motor a couple of times , it sounds like there is a loose bolt or nut getting thrown around in the engine or the tranny. it has to rev pretty high in order to make the noise. i removed the flywheel cover to see if there was anything in there, but there was not. if anyone has experienced this before, please let me know. thanks

could a bearing make that noise maybe?

Noises are Gremlin's and hide in strange places.

I thought I was throwing a rod once and it turned out that the 1 year old  salvagedonor engine was
wallering-out the keyway for the drive sprocket for the timing belt.

There is a resent post on this problem.

CAPT

mine was making the same noise sounded like a bolt being thrown around the engine turned out my exhaust coupler right off the header was loose,the part with the 2 springs sorry i dont know the name of it . try that you may get lucky.

Well, i drained the motor oil today and it looked good, but when i drained the transmission oil , there was very little and some metal shavings, i think they are syncros. I think i will remove the transmission and rebuild it, has anyone done this themselves, is it possible. Or do i leave it to an expert tranny guy?

Well, i drained the motor oil today and it looked good, but when i drained the transmission oil , there was very little and some metal shavings, i think they are syncros. I think i will remove the transmission and rebuild it, has anyone done this themselves, is it possible. Or do i leave it to an expert tranny guy?

They aren't hard to rebuild.  As long as you have some mechanical aptitude, and a decent exploded tranny pic (or just lay out the pieces in the order of removal) you should be ok.