Auto transmission issues '88 MJ Pioneer

[Lungshot]

My '88 MJ Pioneer has been intermittently (hot or cold) slipping out of gear and not up-shifting to 3rd. I've had the tranny serviced with an additive that did help for about 6 months. The previous owner had the tranny serviced twice before I bought it. I installed a new TPS which had no affect. Are there any other things I might look at before I head to the transmission shop?

Thx

[ghetdjc320]

Is it an aw4?

[cruiser54]

Did you adjust the TPS?

 

Have you completed Tips 1 through 5 on my website? Tip 10?

[Lungshot]

getdjc320: I looked for an ID plate on the tranny but couldn't find one, so not sure if it's an AW4.

 

Cruiser54: I did adjust the TPS 4-pin output voltage, but no affect (I then readjusted the 3-pin output voltage to spec). I'll complete the remaining steps ASAP!

 

Thx again!

Edited June 7, 2020 by Lungshot
additional info

[cruiser54]

If it's a 4.0, it's an AW4. 

[omega_rugal]

On 6/6/2020 at 4:38 PM, Lungshot said:

I've had the tranny serviced with an additive that did help for about 6 months

 

what kid of additive?

[cruiser54]

Have you adjusted the throttle valve cable?

 

There's a youtube video on it. Needs to be done. 

[Lungshot]

On 6/8/2020 at 10:04 PM, omega_rugal said:

 

what kid of additive?

They didn't tell me, and there closed up for now.

[Lungshot]

On 6/9/2020 at 7:02 AM, cruiser54 said:

Have you adjusted the throttle valve cable?

 

There's a youtube video on it. Needs to be done. 

Thx! That will be next! I've noticed a decrease in idle rpm lately, hmmm...

[Lungshot]

I have the TV cable version that is located behind the throttle body. When I push the button down the "cap-like" looking thing is fully retracted. After I depress and release gas pedal, it remains in the same position. Is the ratchet worn out? See pic... BTW, shifting problem is still intermittent...