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1990 Pathfinder HELP!
Posted 21 October 2007 - 01:42 PM
Posted 21 October 2007 - 07:41 PM
If he beat on it, or slammed it into gear, or yanked it out of gear without using the clutch, chances are it has a broken shift fork or shift rail. The Aisin transmissions both Nissan and Toyota used were good for this, I had a five speed in a 94 3/4 ton 2wd that first broke a fork, then broke that same rail a few months later.
Not too hard of a fix if you've had manual trannies apart before, both times I tore mine down on the porch of my apartment.
Another thought is the plastic ball on the bottom of the shifter may be worn out, this bushing isolates the shifter so you don't hear the tranny as much. If this wears out, it is possible to get the tranny into two gears at once, or not fully engage gears.
Posted 22 October 2007 - 08:19 PM
Posted 22 October 2007 - 10:18 PM
If the shifter has lots of slop, and really vague feel-
Pull the boot and insulator up the shifter, there should be a little rubber boot around the shifter on the tranny. Pull that up, and there is a little stamped steel piece that holds the shifter in place in the tranny. Push this down and turn 1/4turn ccw, then pull the shifter up and out of the tranny. If there is a white plastic ball on the end of the shifter, and the slots in the three rods line up, that's not your problem.
Bear in mind, this may have a slightly different style shifter, so you may want to consult a manual.
Posted 08 November 2007 - 08:07 AM
If it's of the design where the top of the transmission can be unbolted and the shifter and all the shift forks are removed in one go, then you can probably fix it no problem. If it's of the design that just the shifter can be removed and all of the shift rails and forks can only be removed with some major disassembly, then you might be screwed as far as an easy fix is concerned.
Essentially, all of the shift forks engage a sliding collar. When the collar slides one way or another, they engage gears. You've got a collar that won't return to its center, its neutral position. This can be because a shift fork is bent, there is wear on the detents of the shifter shafts, or because the end of the shifter (or the ends of the shift shafts themselves) are worn. Pull the shifter out and look in. Are all of the shifter shafts lined up? There should be three of them. Is one out of position? Try to pry it back with a screwdriver. If the shifter shafts are all in line and it still does it, then I'd suspect a bent/broken shift fork or maybe a sheared roll pin between a shift fork and shaft. If the shift shafts are not lined up and you are able to move it back into position, and it works normally, then I would tell your friend to shif the truck slowly in an exaggerated H-pattern. Not moving the shifter in a straight line from second to third, for example. move the shifter up, then right, then up again. This will keep the worn components from accidently engaging things they aren't supposed to.
This happened to me on the BABE rally in may. Furiously working the shifer back and forth fixed it (don't do that).
The above rambling makes sense. To me, anyway.
Posted 08 November 2007 - 09:10 PM
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