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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> pinion gear assembly (how to shim)
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Topic Review (Newest First)
07-23-2012 07:38 AM
bugget_jr anybody knows how to do a proper assembly of the inner retainer of the drive shaft? should I heat the inner retainer so it shrinks or can I just press it on? And how important is it to have new gasket (at the brake backing plate)? because the axles I know have is in bad shape and is going to be replaced when I got new ones (about a mounth from now) and donīt want to spend to much money on something temporarily.
07-10-2012 12:44 PM
big gear head You should have to put around 300 foot pounds of torque on the pinion nut to get the crush spacer to crush. If the bearings got tight before that then you have a problem. The spacer may be used or it might have been a bad one that was made too short.
07-10-2012 11:30 AM
chieftain The pinion should be loose the entire time until the rotational torque is correct. Also the numbers you posted seems low, usually the lower numbers are for used bearings(6-15 in lbs). Usually new bearings are 15-29 in lbs...
07-10-2012 10:54 AM
bugget_jr ok, so I got a nice pattern so I began to install the pinion for the final time. I installed a new seal and a new crush sleeve but I got really worried when I started to screw the pinion nut. I was told that I should screw until I feel the crush sleeve crushes (it would rotate easier) and that it would take a lot of wrench torque until it crushes. So I started to screw the nut (really hard) but not until it crushed because the pinion got stuck (I couldnīt rotate the pinion). Is this normal and will the pressure release when it crushes?
07-08-2012 04:41 PM
big gear head I'm going to assume that you are turning this with the pinion gear because the pattern is not clear with defined edges. I recommend sticking an axle in and use the axle to turn it several times in both directions to get a more clear pattern. Also be sure that the pinion bearing preload is set correctly every time.

The .026 pattern looks pretty good. The .030 pattern looks pretty good on the drive side, but the coast side is a little too much on the root. Go back to the .026 and make some adjustments to the backlash to see if the coast pattern will move toward the heel some. Use the axle to turn it.
07-08-2012 02:56 PM
lmsport The .026 looks better.
07-08-2012 02:22 PM
bugget_jr ok, I tried out the 0.03" shim but i think it made the pattern to close the root?

Hereīs som pics with the 0.03 shim:

07-08-2012 01:53 PM
lmsport The .026 pattern looks pretty good. The coast being biased toward the toe is not great but would probably work out.
07-08-2012 12:58 PM
bugget_jr Iīm not sure what the shim thickness was in the previous post but I think it was 0.037". Ok, iīm going to try out the 0.03 shim. Should the gears make noise with this setup? What should I prefer, a setup too close to the root or a setup close at the toe as this setup?
07-08-2012 12:41 PM
lmsport What was the shim in the pics in the previous post?

THe .026 looks way better. Might try going to .03 and checking if the coast side will move more to the center of the heel-toe.
07-08-2012 11:38 AM
bugget_jr alright, so I changed the pinion a bunch of times and with a 0.026" shim gives the widest pattern I think, also the 0.02 shim makes a wide pattern. I took some photos on a bunch of shims, because Iīve tried all possible shim combinations now and it wonīt get centered.

0.026 shims with good BL gives:

0.02 shim with good BL gives:

0.017 shim with good BL gives:

Is the 0.026" shim good?
07-07-2012 07:40 AM
big gear head The most important thing is to get the pattern centered between the root and face. Right now your pattern is too far to the root, which means that you pinion is still too deep. Moving the pinion depth will change the root to face pattern. Backlash controlls the heel to toe pattern after the pinion depth is set correctly. Look at the pattern that you have now. Don't pay any attention to where it is located heel to toe, only look at root to face. Keep reducing the pinion shim until the pattern is centered between the root and face of the tooth. The pattern should get wider as it moves away from the root. Each time you change the pinion depth you will have to reset the backlash. Keep the backlash at about .007 to .009 until you get the pinion depth correct. Then you can make slight changes to the backlash to fine tune the pattern.
07-07-2012 07:30 AM
bugget_jr thanks for all help, understood it wasnīt easy to see the last pictures but my brothers cellphone camera was much better so hereīs an update:

coast side:

drive side:

Hereīs some of my thoughts: Whatīs most important, a soft pattern or an centered?

If I have less pinion shims doesnīt that equal to more backlash (and too far up on the top) and if I decrease the BL thatīs equal to make the pattern to far down to the toe side on both side? (you guys is probably right, Iīm just trying to figure out where I thinking wrong)

really appreciate all the help
06-29-2012 10:14 AM
lmsport The pattern is heavy toward the toe on drive and coast, so PD must be close. Make sure when adjusting BL that you keep the total shim amount the same to maintain the bearing preload.
06-29-2012 09:10 AM
AutoGear Welcome home Freddie
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