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[Grandsatsuma]

Can anyone explain why these 2 reverse idler gears are different? One is from a DAM2886 the other is from DAM5626. The latter seems to have a shoulder and the bushing sticks out a bit.

http://imgur.com/gallery/R78Cpp5

[Spider]

Some of the later cases had differences in machining and so the step was introduced.

 

When fitting up the Reverse Idler Gear, you need to check you are getting correct engagement by assembling the input shift rod and using that the check with.

 

The bush that's hanging out is one that's on the move. The early and very very late Reverse Idlers had a single, long one piece bush and they are fine. There was a period where they fitted 2 short bushes and it's not uncommon for them to go for a walk. Usually when that happens, the shifter become very stiff to move across the Neutral Gate or it will be locked over towards Reverse. These are interchangeable with the single type bushed gears (or you can fit & ream a new single bush), but just check the engagement of the gear as above if swapping out.