4th gear and immediately goes to overdrive
 

I posted on here a while back about my tranny not having 4th gear. I've had the tranny fully rebuilt with solenoids and torque converter, this jeep is basically new with how many parts I've replaced now. Turns out from what I'm seeing is it goes to 4th and then straight to overdrive. I don't have much throttle until it gets close to around 120 km. I've adjusted the tv cable but maybe it's so worn out and stretched a need a new one?

4th is overdrive. After that the torque converter locks up. That what you're feeling?

On my '98, the torque converter tends to lock up just a second or two after the 3-4 upshift. Also, when it I give it enough gas in 4th with the TC locked, it'll downshift to 3rd as soon as the TC unlocks. In other words, it's very uncommon for the transmission to be in 4th with the TC unlocked.

Getting up to freeway speeds with a decent amount of throttle angle will keep it in 4th for a bit of time. Tapping the brakes while maintaining throttle position will unlock the TC while remaining in 4th.

Well as soon as it shifts it drops in rpm and I have very little throttle response unless I push it to the floor and it drops a gear.

I'm guessing that is what mine is doing, I'm a rookie when it comes to transmissions. So when the torque converter locks up you won't get as much throttle response?

Have you adjusted your throttle valve cable?
Ever changed the fluid with Dex/Merc ATF?

I have done both so I was wondering if maybe the cable is stretched out to the point where it won't shift properly.

Doubtful. But easy to check.
There's generally 1/16" of slack in the cable at the throttle body.
Dex/Merc and not Chrysler ATF+4?

Dex/Merc from Napa. Tps has been replaced along with a new throttle body, new exhaust system with catalytic converter, new upstream and downstream O2 sensors.

Just for fun, go to www.cruiser54.com and complete Tip 10.CRUISER'S MOSTLY RENIX TIPS

TRANSMISSION CONNECTOR REFRESHING

OCTOBER 30, 2015 SALAD 19 COMMENTS EDIT

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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 itselfhttps://i1.wp.com/cruiser54.com/wp-c...size=263%2C197https://i2.wp.com/cruiser54.com/wp-c...size=300%2C225
. 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.

I also refreshed these during install of the newly built transmission. I'm really not sure of what it could be anymore, bad computer maybe? This all started the first time I removed the tranny because of a bad pump seal,it would shift fine and I would have throttle response when it shifted to fourth.

Grab a TCU from a junkyard? Find out where the present TCU grounds?

I'll give the ground a good refreshing and see what happens, just seems odd that this all started when the tranny was pulled and put back in. Finding another tcu might not be that easy because people want good money for the wrecked jeeps here. What years would be compatible?

Have you ever removed the TCU? Couldn't hurt to refresh that connection along with refreshing the ground point.