This 4.62 pinion has the #382 on it. Dial gauge indicates 1.900 from bearing center line to pinion. Plan is to measure the used 3.90 set before i disassemble it and than get the same measurement in the starion housing and than set backlash and check pattern.
The problem is the 4.22 gear set is new and i don't have the luxury of using the dial gauge reading as a starting point. Can the correct dial gauge reading be calculated from the # i hope to find on the 4.22 pinion? The 4.22 starion rear is already assembled by a previous owner but has never been run. The preloaded are that tight we can barely turn it. I will check the pattern before i proceed.
Do the pinion bearings interchange between the the truck and starion rears?
Any pointers from those who have do the swap. I assembled Mack truck rears years ago so i do have some experience with gear set up.
Early on i thought the pinion depth gauge would minimize the trial and error. I had the 3.90 pinion in two different starion housings and it was telling me the 3.90 sat .035 lower than it did in the truck housing. I rolled the dice and added the .035 to the original shim. It was not even close, way to many shims. I then tried the original starion housing .065 shim (truck housing shim was .064). That was to little, went to .075,that was to much. Ended up at .069. In all 9 pinion shim changes.
When i put the new bearings on and it threw of the pattern, the gauge would have given me an ideal how much, but i had not taken a reading before the change. Repeat ability with the gauge was good in the same housing. I don't know where the error came from.
Edited by StarquestRescue, 19 August 2009 - 04:20 PM.