ring and pinion pattern hassles

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  #1  
Old 02-13-09, 09:49 AM
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ring and pinion pattern hassles

this has to do with rear end rebuilds and testing for the pinion shim width.
After you check the pattern you test for the correct pinion shim. But you cant just pull out the pinion gear to install it without loosening the ring gear because they are somewhat meshed.
Is the only way to do this to loosen both sides of the ring bearing tighteners
evenly and then put them back where they were (when you did the case spread) after you reinstall the pinion.???Then you have to reset the backlash right?????
would it be better to just wait to set the backlash until the end anyway??
Are there aftermarket jigs that can test for pinion shim width that dont
cost a lot like the Ford tools etc..??It seems like there should be....
how much time do people put into the test pattern anyway??
This is about 80s rear ends, ...are newer rear ends designed to tested
for pattern without all these hassles??
This question is for people who have rebuilt several ring and pinion sets at least.. thanks
 
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  #2  
Old 02-13-09, 11:04 PM
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pinion depth is a easy measurement, when you get the new pinion there is a =/- number on the pinion head, you need to mic the old shim and add or sub the difference there is a chart for this. When you get this measurement and install the pinion you need to tighten the pinion nut 15-30 in lbs for new bearings.
from there you need to check total pinion turning torque this is the total of the pinion torque plus the side bearing preload. I usually set the pinion turning torque to 25 in lbs, the total pinion torque to 32in lbs and backlash usually at .004-.005 in depends on the specs.
What 80's rear ends are you talking about, dana's, 9in, 8 3/4, 10 bolt, 12 bolts, 8.8??? it's all the same, mic the old shim use the markings on the new shim and +/- the diff. If you change the housing on a integral type ie dana then you need to start pinion depth fron scratch....
 
  #3  
Old 02-15-09, 03:30 PM
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Originally Posted by diy99999 View Post
this has to do with rear end rebuilds and testing for the pinion shim width.
After you check the pattern you test for the correct pinion shim. But you cant just pull out the pinion gear to install it without loosening the ring gear because they are somewhat meshed.

Kumi has it nailed the pinion depth is set before checking the pattern.

Is the only way to do this to loosen both sides of the ring bearing tighteners
evenly and then put them back where they were (when you did the case spread) after you reinstall the pinion.???Then you have to reset the backlash right?????

the only way to remove the pinion is to remove the ring gear alright.

would it be better to just wait to set the backlash until the end anyway??
Are there aftermarket jigs that can test for pinion shim width that dont
cost a lot like the Ford tools etc..??It seems like there should be....
how much time do people put into the test pattern anyway??

that depends on what they are doing with the rear end, drag racing, street driving? both put diferent loads on the gears

This is about 80s rear ends, ...are newer rear ends designed to tested
for pattern without all these hassles??

NO
This question is for people who have rebuilt several ring and pinion sets at least.. thanks
are you going to cowboy up or just lay there and bleed?
 

Last edited by Speedwrench; 02-15-09 at 03:32 PM. Reason: clarity
  #4  
Old 03-12-09, 07:53 PM
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what was the out come on the set up? what did the pattern look like?yes you have to pull ou the pinion to reset the pin depth, unless you have a front load pinion assembly ie: 9"ford 14 bolt ff gm.which means you need to reset backlash because you pull the carrier out each time. if you are talking about a case spreader it is probably a dana rear.pete
 
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