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Old 03-14-2009, 02:26 PM   #1
destro500 OP
Joined: Mar 2009
Location: Philly
Oddometer: 17
Tranny Rebuild Part 2

Well I am finally putting my '75 R90/6 tranny back together and I have encountered a problem. After measuring the endplay of the shafts, I thought I shimmed them apropiately leaving .004" clearance. However, after putting the cover back on, I am not able to spin either shaft by hand. I can do it with a 20 mm box wrench on the input shaft but I kind of remember being able to turn both shafts by hand. To test that I shimmed improperly, I removed the shims and tried again but with the same results, still hard to turn shafts. Any ideas as to what i could be doing wrong?
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Old 03-14-2009, 03:05 PM   #2
I suck toes
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Joined: Oct 2001
Location: Cornersville, TN
Oddometer: 29,206
Best is to start over. If it isn't shimmed right and the shafts don't turn freely, you are going to have problems.

Make a chart with each shaft listed, a line for the clearance measured, and another line for the calculated shim needed. That's the easiest way to keep it all straight, then double-check your work before you put the plate back on.

You might want to look at and for more info. has good videos of the rebuild process.
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Old 03-14-2009, 03:31 PM   #3
Reluctant Cannonball
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Joined: Jun 2006
Location: FunkyTown
Oddometer: 2,767
before you take it all apart, rap on the input shaft with a soft hammer (pretty hard). the last couple times I did that it set that bushing in enough to free it up. You are trying to spin them in neutral first right?
'twas ever thus
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Old 03-14-2009, 04:52 PM   #4
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Joined: Jul 2002
Location: Jackson's Bottom Oregon
Oddometer: 8,233
While the case is still warm and the cover is back on, with a rubber mallet, strike the case (input shaft too) a good WHAP at each of the bearing pockets. This will help fully seat the bearings and can make all the difference.

And, yes, the input shaft should spin freely by hand, and in any of the gears with a little resistance.
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