Q: it dont want to backup,acts like its going to tear the rear end out. on 1995 GMC Jimmy

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
checked transmission fluid, and goes fine forward
(2) Answers
you have an internal trans failure. you will need a trans shop to remove it, identify the issue and re build the unit.

You'll want to visit a reputable transmission shop for a test drive and diagnosis. Its sounds like and obvious driveline issue.
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