Question about 1986 Jeep Cherokee

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How to rebuild a transmisson for a jeep cherokee 1986 4by4

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  • Dar
    Dar May 11, 2010

    yeah... okay.

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Manual or Automatic? The 1986 Jeep Cherokee 4x4 used both.

With the manual version, it would be best if you had someone who has done this a few times to help you.

1.You need to check all the gear teeth. No cracks, chips, or broken teeth. The reverse gear, and the countershaft gear that mates to it, can have slightly worn teeth, and maybe a tiny chip, on a few gear teeth. These can be ground down to a serviceable condition, if the chip is a very slight one. The reasoning behind this, is that the reverse gear should be engaged when fully stopped. There is no brass synchronizer ring.

2.The tapered part of the 1st, 2nd, 3rd, and 4th gear, should be checked for clearance, with the brass synchronizer ring pushed up against it. If it is too loose, you cannot use this ring. If the triangular teeth on the synchronizer ring, are worn too much, you cannot use this ring. These teeth are what engage to speed the gear up, so that it will match the rotating speed of the rest of mainshaft. Your transmission will also pop out of gear, if these teeth are bad.
(Synchronizer rings are also reffered to as 'Blocker Rings)

3.Check the detents in the hubs. The rectangular shaped pieces of metal, on the hub/s, that the sliding collar engage. Check the circular shaped metal springs for these detents, also.

4.There are probably 113 small needle bearings, for the countershaft. This are so much fun to remove and install, that you'll want to stay up at night and do it! One front mainshaft bearing, and one rear mainshaft bearing. The input shaft cover has a bushing.

Below are four links that may help explain the basics. Past this point, I suggest a detailed manual. Your average Chiltons and Haynes manual, will probably not have this info. You need a shop manual.
I have included automatic transmissions also. This is a job best left to a pro. Sometimes they make mistakes too!
1.http://www.howstuffworks.com/transmission.htm
2.http://auto.howstuffworks.com/automatic-transmission.htm
3.http://en.wikipedia.org/wiki/Manual_transmission
4.http://en.wikipedia.org/wiki/Automatic_transmission

Posted on May 18, 2009

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