1988 Trans Slipping

[gai092460]

Hi My Fellow Comanche 

 

I. just recently had mad my 1988 Jeep. Comanche 4 L automatic trans rebuilt $2,200 later the trans shifts 

 

perfectly up. until. I. switch the power trans switch on. the dash. board it then. starts slipping like crazy ,

 

The trans shop. is saying its electrical. because his claim. is the trans is perfect its something with the 

 

switch ,Please ideas 

 

Thanks George 

[cruiser54]

The switch only changes the timing of the shifts. 

 

Unless when the TCU gets that Power signal the power is shorted to something else in the TCU?

[gai092460]

Thank you 

[ParadiseMJ]

Are you using Dex/Merc or ATF+4. 

[gai092460]

I will ask. the repair shop ,is there difference in performance ?

[ParadiseMJ]

Manufacturer specs for an 88 AW4, it's Dex III (or Dex/Merc) not a Chrysler. Aisin/warner (aka Toyota)

 

In newer Chrysler trannies it's ATF+4 (not Dex)

 

I have not experienced the difference in ATF+4 in an AW4, but I've heard, read, that it can cause harm, maybe permanent...not sure.

[Comavalanche]

Hi My Fellow Comanche 

 

I. just recently had mad my 1988 Jeep. Comanche 4 L automatic trans rebuilt $2,200 later the trans shifts 

 

perfectly up. until. I. switch the power trans switch on. the dash. board it then. starts slipping like crazy ,

 

The trans shop. is saying its electrical. because his claim. is the trans is perfect its something with the 

 

switch ,Please ideas 

 

Thanks George 

Yesterday I flipped the power/comfort switch from power to comfort (I always leave it in power) and it would not down shift; it was stuck in fourth gear (AW-4). Another thread on CC said to check an inline fuse under the passenger-side dash. Mine was tripped. Replaced it then unhooked positive battery cable then reconnected it and now it's back to normal.

[cruiser54]

Your Power/Comfort switch may be bad. 

 

I would bypass it:

 

http://cruiser54.com/?p=435