| The Dana 60 gear support case can be modified so it will receive any ratio gear. The breaking point falls between 4.10 and 4.56 ratios. So if you have a case with 4.10 ratio and you want to go to the 4.56 ratio you would normally have to change the case or go with a ring gear spacer. In this case the object is to move the case flange .187" closer to the center line of the pinion. Any qualified lathe operator can machine the shoulder of the bearing journal and trim an equal amount from the end of the journal. Be sure to leave a radius at the root of the bearing journal. A square corner will break. You will need a 3/16" or .187" shim ahead of the bearing on the opposite side. I have found that a large washer from the hardware store that is close to the thickness needed will work. You will have to ream out the bore to fit the bearing journal. If you wanted to go to 4.10 ratio from 4.56 ratio you would definitely have to change the case. But with this system you can just machine the opposite side and move the case flange 3/16" or .187" away from the center line of the pinion. This system does not work with the ARB units because of the air pressure in the journals. |
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