Question about 1988 Jeep Cherokee

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I have a 1988 Jeep Cherokee with 4.0 inline 6, 4 speed auto 4X4 transmission. I replaced the front pump in the trans because I thought that was the problem but it is still doing the same thing. It will not engage into gear. I have had it engage twice, and when it does/did it kinda jerks into gear but does not slip. It will only move about 30ft and it comes out of gear again. I don't know what is causing it to do this. I am almost certain that the trans is good but I was told that there is another pump in the trans but I am not sure where it is at. I replaced the pump right behind the bell housing. I'm not sure if that other pump might be the problem but I would like to know where it is at. ANY help would be great. PLEASE thanks in advance.

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  • Jeep Master
  • 6,982 Answers

After about 1962 or '63, pretty much no transmission had a second pump (was called a rear pump) which is why you can't push start an automatic car. Most pumps fail because debris gets into them from a failure elsewhere inside the unit, scoring up the face plate and gears, lowering pump pressure.
You likely have a bad seal, worn seal surface on a shaft etc that is causing you problems. At this point, best thing you can do is either do a complete rebuild or get another good unit.

Posted on Aug 24, 2010

  • 3 more comments 
  • Joshua Sutcliffe Aug 25, 2010

    We will be replacing the unit tomorrow to see if that will fix the problem I will post our results tomorrow.

  • Joshua Sutcliffe Aug 25, 2010

    We will be replacing the unit tomorrow to see if that will fix the problem I will post our results tomorrow.

  • Joshua Sutcliffe Aug 25, 2010

    We will be replacing the unit tomorrow to see if that will fix the problem I will post our results tomorrow.

  • Joshua Sutcliffe Aug 25, 2010

    We will be replacing the unit tomorrow to see if that will fix the problem I will post our results tomorrow.

  • Joshua Sutcliffe Aug 25, 2010

    We will be replacing the unit tomorrow to see if that will fix the problem. I will post our results tomorrow.

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Transmission


Transmission
Typo and model:
1.- 4-speed automatic AW-30-40 (6cil start of 1993)
2.- 4-speed automatic 42RE ( 6cil 1993)
3.- 4-speed automatic 46RH ( V8, 1993-1995)
4.- 4-speed automatic 44RE ( 5.2L V8, 1996)
5.- 4-speed automatic 46RE ( 5.9L V8, 1998)
6.- 5-speed automatic 45RFE( 4.7L V8, 1999 in WJ)

Enter the VIN in here: http://jeep.avtograd.ru/VIN/vin_en.asp

Also cHeck this info: http://www.jeep.com/en/4x4/systems_by_vehicle/

Good luck!!!

Dec 05, 2008 | 1993 Jeep Grand Cherokee

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