Tiffin Bus 37AP fan drive gearbox

[1doodadd]

This is what I used

[Crasher]

I had missed the part about servicing the 90 degree box and first decided to change the oil in it at 40,000 miles. Did it again at 60,000. I had read about the box failures, so at 82,000 miles I had a new Curtis one installed intending to have the original for a spare, just like the spare DEF head I have carried. Then out of the blue, we decoded we didn't need the coach in our current lifestyle. It sold to the first party to look at it. At least now, he has a new gearbox.

[weighit]

I too read about the various gear box failures when we first bought our Bus, and ordered a new spare. Just in case. Figured if never needed, would just sell it for what I paid, and looks like in the last couple of years that box has gained almost $300 in value over what it cost when purchased. Didn't want to be stuck waiting for weeks for a replacement box so having my spare was an "insurance" policy. Plus when i ordered it took almost 3 weeks to get, have no idea now how long a wait time would be now.

[DRM901]

Originally Posted by 1doodadd

This is what I used

I used the same grease.

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[NorCal Hal]

Washington to SoCAL, 1250 miles, and no signs of the previous leak. I think overfilling at the Tiffin factory was the cause.