auto transmission problem

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Nov 22, 2013 | 09:14 PM

88Jeepster

Thread Starter

Newbie

Joined: Nov 2013

Posts: 5

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Model: Cherokee

auto transmission problem

I tried to find similar problem with search but no cigar. My 88 Jeep Cherokee Ltd. seems to be slipping when I put it in "D". But if I manually shift to the "1-2" selector it will work fine. Then I manually shift back to "D". Reverse works fine. Oil is red and smells good. Mileage is about 220,000. I am original owner. Bought new in 88. Any suggestions?

Nov 22, 2013 | 10:51 PM

Gimmy

Member

Joined: Sep 2013

Posts: 104

Likes: 0

From: Thurston County WA.

Year: 1990

Model: Cherokee

Engine: 4.0 HO

Valve body may have some gunk in it. Have you changed the filter?

Nov 23, 2013 | 12:36 AM

Radi

CF Veteran

Joined: Apr 2012

Posts: 5,302

Likes: 23

From: Wisconsin

Model: Cherokee

Is it actually slipping or is it starting off in a higher gear (3rd, 4th) in D instead of 1st?
That can happen if there is a TCU or solenoid fault.

Nov 23, 2013 | 07:10 AM

belvedere

CF Veteran

Joined: Jul 2012

Posts: 1,395

Likes: 1

From: SD

Year: 1998

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by 88Jeepster

I am original owner. Bought new in 88.

That is cool!

Nov 23, 2013 | 07:15 AM

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 17

From: Parham, ON

Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

This seems familiar

Quote:

Originally Posted by 88Jeepster

Hi, I'm new to this forum and have a tech question. My 88 Cherokee Ltd. w/auto trans. has slipping feel when starting trans. in "D" gear. However, when I manually shift to "L" to start moving it doesn't slip. I then shift to 2nd then to D and it works OK. Reverse works fine. Fluid level is within limits. Has been changed recently and smells normal. Any ideas would be welcome. Thanks

Quote:

Originally Posted by cruiser54

Check the fuse shown below in the photo. It is the power source for your trans control unit.

Quote:

Originally Posted by salad

What was it changed with? As soon as the warranty dropped on Cherokees Chrysler declared that their own in-house fluid, that meets none of the actual manufacturer's specifications ( well I suppose they're both transmission fluids), should be used because it's cheaper for Chrysler. As a result many of the parts counters dingbats give out ATF+4, same thing for oil service places. The transmission should be filled with Dexron III/Mercon (D/M). Slipping after fluid change is extremely common when this happens.

Nov 23, 2013 | 07:22 AM

CobraMarty

CF Veteran

Joined: Dec 2011

Posts: 1,777

Likes: 22

From: PA KOTUFU!

Year: 1998

Engine: 4.0L 162,000

Quote:

Originally Posted by Radi

Is it actually slipping or is it starting off in a higher gear (3rd, 4th) in D instead of 1st?
That can happen if there is a TCU or solenoid fault.

This, plus a dirty NSS can cause this problem.

I would look up/search and do the NSS cleaning procedure. Don't need to buy a new one.

Nov 23, 2013 | 04:22 PM

88Jeepster

Thread Starter

Newbie

Joined: Nov 2013

Posts: 5

Likes: 0

Model: Cherokee

I'll try to answer all ideas best I can. Fluid change was with DexronIII, no filter change but looked clean. Fuse (10A) under dash pass. side is good. As far as trans. starting off in higher gear or not I'm not sure. If it is in "D" and starts rolling with much higher rpm than normal, I tried shifting to lower gear 1-2, and I can not feel a downshift but it immediately takes off as it should.
How do I determine if it is a TCU or solenoid fault?
Where are the TCU and solenoid located?
Should I check those before the NSS cleaning procedure?

auto transmission problem

auto transmission problem

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