1991 jeep wrangler sahara shifting promblems

automatic? trans, mines a 6speed, and has a clutch.
my guess is yes,
my A/T will not change gears,
all gears slip? (slip , flare or?)
or wont move at all. the car?????
or is stuck in1st gear in drive.?
or wont move in reverse. why not tell full story on so complex a device. super complex it is.
wont up shift , wont down shift
skips gears.
??????????????????

check fuses first.
then scan the PCM, it will tell you errors, called DTCs
use a real scan tool that can scan 2010 Jeeps. (factory codes !!!)
not some autozoned junk.

id bet there is a code, for sure.
even a broken shifter switch, or?

is it stuck in a gear or will it not go into gear without grinding

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The 3rd Gear Synchro is worn or damaged, which is why it grinds when you try to upshift or downshift into 3rd gear. When it goes out completely you will have a very hard time shifting into 3rd gear, since the Synchro lines up the gears to make shifts smooth and easy.

If the transmission oil is full and the clutch master cylinder is full, feels normal and does not slip going up steep grades, likely the gears in the transmission are worn (usually synchros). All items above contribute to proper shift engagement.

if the clutch is draging it will be hard to get your gears and they will chrunch going into gear but its most likly to be a gear box problem could be just low on oil or worse it may be the bulk rings and bearings worn out after all its now nearly 20 years old!

sounds like the flywheel may be cracked

check the linkage from gearstick to gearbox

if this is a 5 speed manual transmission...all you need to do before putting your jeep into reverese is puting it into first gear and then shifting it to reverse to avoid any grinding or problems shifting into reverse...this isn't a problem just a poor jeep design by not installing an extra gear to eliminate this grinding or shifting problem

I would first bleed the tranny lines, if that doesnt work then your tranny is out and need to get it replaced. FYI with Jeep Wranglers, It is better to get a new transmission then to rebuild them