Just changed gear box how do I straighten out the streering wheel?1993 jeep cherokee

Sounds like a grabbing clutch in the gearbox. What is the condition of the fluid in the box, if it is thin and black changing it now may just be in time - hopefully. If not it could mean a transmission overhaul.

the bands in the transmission could be twisted, this is a problem with jeeps.

Have the wheel hub bearings checked.

check 4wd switch on the 4wd gear,may be need to clean or replace

you either have a bad u joint or the transfer case chain is jumping off the gear

But it turns to the left OK? the streering gear is the only thing that can power one way and not the other. Some 4WD can have troble with the outher U joints or CV axel but that is mostly both ways not one way only

Check security of Pump mount bolts. If OK, come back to me!
Regards,DT

You can't put the transfercase in nuetral the car won't move its prolly a all time 4-wheel drive if there isn't a 2-wheel sign on the gear shifer then it's a all the time 4- wheel drive

No, not with out a lot of work. Electronics are most likely different on the 2 also.

Check fluid to make sure it's full. Did you check to make sure that when you move the shifter, the transmission shift lever on the case moves? Assuming it's an automatic, if fluid is full and linkage moves properly, has fluid been changed? If not, do it! (including filter) If when changing fluid, you find an excessive amount of fine metal or clutch material in pan, chances are the unit has worn out and needs rebuild, If everything inside is clean & good then finish with change and check results.If still having same problem it's likely internal or if electrically shifted, a shift module problem etc.