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986 trainmission

C

chris meredith

Member
i got a 986 ih when you put it in rverse it has poping sound in it does anyone have anyideal what it might be it does not pop in any of the forward gears none of the ranges just in reverse and of coarse when you put it in the high gears in reverse it sounds worse any help would be nice if so how much troubl eis it to take it out thansk so much chris
 
I would say that at one time or other someone dropped her into park while still moving or while she was being hauled some where someone left her in park and did not have her tied down tight enough and it broke a tooth off the rev. driven gear . Not and easy repair.
 
I would agree with the broken teeth idea but another possibility is a pinion bearing thats gone. The shaft is forced up in reverse and can jump the teeth of the gears. You can remove the tall side cover on the left side of the range trans to do an inspection for either idea.
 
(quoted from post at 18:09:35 02/26/09) I would agree with the broken teeth idea but another possibility is a pinion bearing thats gone. The shaft is forced up in reverse and can jump the teeth of the gears. You can remove the tall side cover on the left side of the range trans to do an inspection for either idea.
Click to expand...

Low range will also put an upward thrust on the mainshaft. If there were enough play in the bearing to allow the gear teeth to jump it would surely be noticeable in both low and high ranges along with reverse. Teeth broken off the reverse gear on the mainshaft is quite common and the gear is used only for reverse and park lock. If you get two consecutive teeth broken off you can usually hear a little tick in the forward ranges also.
 
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