bobsmc Posted September 16, 2009 Posted September 16, 2009 im trying to set up a 12 bolt and cant find a backlash spec for my gears is there a standard backlash spec? right now im at .011 is that in? help? Quote
72MC Posted September 16, 2009 Posted September 16, 2009 Your close enough. I think the spec is .006-.010 . - Dave Quote
bobsmc Posted September 16, 2009 Author Posted September 16, 2009 does it vary by manufacturer because i saw one co. saying they make there gears to run .008-.012 but someone else says 7 is ideal does pattern matter more than specs? bob Quote
72MC Posted September 16, 2009 Posted September 16, 2009 Bob, if you get a good pattern with a .011 BL spec, you will be good. That being said, I try to get a .007 or .008 BL spec. Pattern is very important. Too deep or too shallow is a bad thing. Hallowing gears at coast, etc., are recipes for failure. - Dave Quote
bobsmc Posted September 16, 2009 Author Posted September 16, 2009 i think i will try to get it closer to 7 but the problem is the install kit only came with .015 shim bing the smallest change. i have .020 .015 .100 thats it.limits the changes. thanks for the advice im not in a hurry so i will take my time and get it right. bob Quote
72MC Posted September 16, 2009 Posted September 16, 2009 Bob, if you want somemore supplies, Randy's ring and pinion have always done good for me. I have two boxes of supplies to build 12 bolts. One other thing, I have started using Richmond's Pinion Spacer instead of the crush sleeve. Very nice piece that helps eliminate the crush sleeve headache. Summit carries this as well as some other shim sizes. I believe the shims are listed under RaTech. Hope your build is successful. - Dave Quote
bobsmc Posted September 16, 2009 Author Posted September 16, 2009 the pinion spacer sounds intresting. i will get some more supplies and a spacer. thanks again. Quote
Heckeng Posted September 17, 2009 Posted September 17, 2009 A spacer would be interesting. I broke my longest 1/2" ratchet trying to tighten my stinkin' crush sleeve! I guess that 3 foot cheater wasn't a good idea! Quote
Andreas Posted September 17, 2009 Posted September 17, 2009 A spacer would be interesting. I broke my longest 1/2" ratchet trying to tighten my stinkin' crush sleeve! I guess that 3 foot cheater wasn't a good idea! I actually used a 3/4" drive breaker bar with a 5 ft 'extension'... WOW! Quote
Heckeng Posted September 17, 2009 Posted September 17, 2009 That is really what you NEED to use. If I had tools that large, I would've used them! I was pushing so hard that I'm not sure if I'll ever even be able to have kids! Quote
72MC Posted September 17, 2009 Posted September 17, 2009 The spacer is a great deal!!! The way I was taught to build rear ends eliminated the crush sleeve all together as its purpose is to make sure that the bearings are not over tightened causing too much preload. I went back to using the pinion spacer as a overkill measure. The torque required to crush a crush sleeve is redonk - u - lus. - Dave Quote
Big Jim Posted September 17, 2009 Posted September 17, 2009 Dave, I wish you were here. I would have let you build my rearend. Jim Quote
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