Tran's problem ?

[PitBull4X4]

I have an all stock 87 Comanche 2 wheel drive    4 liter, auto    Problem is when you drive, it has power up to 30-35 than it falls on its face. I did tune up and still doe's it. A guy said it might be the shift points are off. Any help would be great.
    Fred

[Rick_Bear]

Sounds like you're loosing compression....IF that's the case...that's NOT good.

[PitBull4X4]

Could it be the throttle body sensor?
  Fred

[Rick_Bear]

Possibly

[hillbilly]

my old f150 explorer had a stupid little vacuum spring assembly on the trans and it did that same thing switched it out and it worked dont know if jeep has that or not

[DeadheadTJ]

Hey Hillbilly,
     Sorry to get off topic, but what's the deal with the F150 vacuum spring - a - majig??? Where's it located on the trans and how much of a hassle is it to swap out? My F150 upshifts so fast it feels like I dropped an anchor! Again....sorry for deviating from the subject matter!

[hillbilly]

on the side of the trans round looking has a snap spring to hold it in  ask the boys at any autozone their comp should show it

[DeadheadTJ]

Thanks Adam...I'll try it before I trash the AOD.

[rubyyj]

i have a 93 cherokee and mine was doing this as well.  i replaced the tps sensor and it now shifts fine.  just an idea, im not familiar with the earlier years 4.0

[PitBull4X4]

Thanks for all the info. We got it working. On the dash there is the power/economy switch and it works ok when you have it on the power setting. Going to try to get a new switch.
        Fred

[hillbilly]

shouldve thought about that mine did that with the switch after i changed to bigger tires