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ahale2772 wrote:here is how I did the preload... both shafts to .005
first, press all the new bearings on the main and counter shaft. make sure the bearings are FULLY pressed on to the shafts. install the input bearing retainer, front counter shaft retaining snap ring and put the races on the rear bearings. set the trans on its nose so that both shafts are vertical.
note: I did all of this with the bearings dry, so that no oil would effect my measurements.
Next, you need to measure the protrusion of the main and countershaft races. used a depth micrometer and check many places on the race to get an accurate reading. I found that the countershaft race was set in the case more and would not rock. But the main shaft race rocked 2 thousands of an inch. therefor I got the average of all of the measurements.
the mainshaft race...
the countershaft race...
it is SUPER important to get these numbers right. any doubt, check it again.
next, you will need to measure the depth of the machined counterbores in the tail housing casting. these numbers should be very accurate around the curcumferance of the bore.
main shaft bore..
counter shaft bore...
my measurements...
first the main shaft...
the race protruded from the case .233
the counterbore for the mainshaft was .255
subtract .233 from .255 and you get .022
REMEMBER this is the amout of shims you would need for ZERO preload.
the preload I used was .005, hence to get the correct prelaod you need to add .005 to .022 and I needed .027 inches worth of shims.
next, the counter shaft.
I found that the race protruded from the case.038
the counterbore on the tailhousing was .103
hence I would need .061 inches worth of shims for ZERO preload
add .005 to .061 and .066 is my final shim requirement for the counter shaft.
next, measure your shims.
I bought a main and countershaft shims from ZBAG, they were about 7bucks each and well worth it. ALLTHOUGH, they didnt have any shims for the countershaft over .010.
shims for the main shaft. .020 +.007
countershaft .020 X3, .006
your job should be complete, have someone check your math and the n your ready for assembly.
just to check... I put the tail housing on for a mock up run and used a feeler guage to check how much the housing was wsitting off of the case.
.004 was loose, .006 was too tight... .005 fit just right
tighten her up!
Mark Nixon wrote:Ellis, hope you do as I suggested and open up the slot(s) in the input a bit.
Also, it may be overkill, but if you PLAN to tow heavy, have the case magna-fluxed, it's worth it.
.
PToombs wrote:Clean your bloody hands get on the real computer! Good writeup Mr. Ellis.
You should add that there is a flat side on the input shaft gear that should go "down" for better movement forward when disassembling. Also, be careful when driving on the countershaft shaft. If you get near the edge, you can break off the lip of the snap ring groove going in or out with it.
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