32RH wont shift

Check your transmission fluid level as a start.

The noise could be low fluid.

If you only have first gear with no up shifts and reverse, something is wrong with the governor.

Edit:

There is another symptom listed as stuck on low gear (will not upshift). Possibilities with that symptom are gearshift or throttle linkage or cable out of adjustment, front band out of adjustment like Mac is saying and a bunch of other internal stuff.

What gears can you actually get?

Diagnosis by symptom starts on page 12 of this PDF.

Mac57 said:

Check your transmission fluid level as a start.

Click to expand...

While the Jeep is running and in neutral.

Your previous post mentioned some rust on your Jeep... possible you lost a TV cable, a linkage or a mount broke off?

-Mac

Yeah, I'd definitely start with the fluid level and checking external hardware; very possible that rattle is coming from outside the transmission. After that, figure out the exact details of where it will and won't shift to (as others have said) and you can start figuring out whether it'll need to be opened up.