Your input shaft bearing is going bad, it will get worse if not replaced
The front axle gear ratio for a 1997 Jeep Wrangler can vary depending on the specific model and options. Common gear ratios for this model include 3.07, 3.55, 3.73, and 4.10. It's important to check the vehicle’s specifications or the build sheet for the exact ratio of a particular Jeep Wrangler.
80w90
This is for 1994. Maybe the same? http://www.jeepforum.com/forum/showthread.php?t=498155
3rd gear is bad,must put new gear in or replace transmission.
My jeep wrangler keeps loking in gears
Jeep Wrangler only,
80w90
75w90 gear oil75w90 gear oil
Input shaft bearing is probably bad, especially if it is noisy in every gear but 4th
your shift lever bushings are bad, easy fix.
The 4 cylinder models have a gear ratio of 4.10:1
3.07 or 3.73 to 1