Hello jeep friends,
I have a 1999 Jeep Cherokee with 165,000 miles. I bought it for a winter vehicle since I live in Michigan. The jeep won't go into overdrive. If I stop put it in park, shut it off, then start it back up then it shifts into overdrive. Any suggestions? Changed the nss. Still does it. Thanks all

 

Here's something to try. Can't hurt and can only help. You don't have the fuse, but the other stuff applies.
CRUISER'S MOSTLY RENIX TIPS

TRANSMISSION CONNECTOR REFRESHING

OCTOBER 30, 2015 SALAD 19 COMMENTS EDIT



Over near the transmission dipstick tube are 2 rather large connectors. One is black and goes to the NSS and the gray connector goes to the transmission itself
. These 2 connectors carry all the info between TPS, TCU, NSS, speed sensor, and transmission solenoids.

Unplug each one, visually inspect for corrosion or bent pins, spray them out with electrical contact cleaner and plug them back in.

Additionally, if your Jeep is an ’87 to ’90 Renix, it’s always a good idea to reach up under the glovebox area and unplug the connector to the TCU and spray it out along with the receptacle of the TCU. While you’re there, find the fuse right in that area for the TCU. Remove it and spray out it’s receptacle and clean any corrosion from the fuse.

 

Ok cool. I'll try it. Hopefully it takes care of the issue.

 

Shift solenoids if it isn't the grounds.
Easier to change out than u think, cheap but messy...

 

I would first check with a scan tool to see if the gear selector switch is acknowledging the overdrive position... assuming it works that way.

Weird things happen when that gear selector switch on the transmission goes awry. They are expensive but can be taken apart and cleaned if you're careful and patient.