How to test a Series gearbox when it is out of the truck - Defender Source
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  #1  
Old October 30th, 2013, 08:12 PM
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Clark Bowen
1969 Series 2a/OM617 Bugeye 88"
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How to test a Series gearbox when it is out of the truck

Are there some good checks/tests to do to see if a Series 3 gearbox I bought is ok?
Hate to install it and have issues.
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  #2  
Old October 30th, 2013, 09:16 PM
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Rob Wollschlager
72 SIII 88
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a way to do it is move the shifter forks through each gear and rotate the input or output shaft and listen or feel for vibrations, catches, or clunks. You can hook it up to an electric drill to get it to spin a little faster. If there is oil in it, drain it and look for chunks. If you are really gung ho, you can pop off the top cover in short order, be mindful of the detent balls and springs (they like to run around), and look at the gears and synchros. The gears should not be pitted or missing chunks, and the synchros should have little brass rows of ridges on their insides and should not be smooth.

-Rob
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