Hows this pattern look?
Hows this pattern look? First time doing a gear install from scratch. They are motive performance 4.10's. Backlash is .006 which is what is etched on the ring gear, and the pinion shim is .035". Old set had .028 shims in it and the pinion depth on the new pinion was .007" shallower so I figured .035" would be a good starting point.
Drive
Coast
Drive
Coast
Staging Lane
Joined: Feb 2010
Posts: 77
Likes: 0
From: warrington
looks like coast side could go a little deeper. this is just how mine looked when i did my motive 3.90 install. i left it that way becuase it was already the fourth time i had it out. it whines a little during very light throttle coast and decel but not bad at all. up to you. could try a few thousands thicker pinion shim and see where it puts you.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Looks pretty good to me. I usually set my Motive's up to .007 with a mock-up bearing, and when I do a final install with a new bearing it tightens it up by .001.
Finished it up and took it for a drive yesterday. Gears are pretty much silent with a very faint hint of whine off the gas at 70mph indicated speed (speedo is still calibrated for 3.73's). The drive stayed pretty much in the same place but the coasted centered up a bit after I put on new bearings and set the pre-load with the solid pinion spacer. I also had to move the carrier .002" away from the pinion to keep the .006" backlash. Overall I'm happy with it.
One more thing worth mentioning is how much thinner the metal thickness of the napa crush sleeve I had in there was compared to the ratech one in the install kit. I still used a solid spacer, but it ended up .010" thicker than the crush sleeve I took out.
One more thing worth mentioning is how much thinner the metal thickness of the napa crush sleeve I had in there was compared to the ratech one in the install kit. I still used a solid spacer, but it ended up .010" thicker than the crush sleeve I took out.
Last edited by speed_demon24; Jan 1, 2012 at 11:45 AM.
Trending Topics
My old gears were motive too and the pinion depth on my new ones read .007 deeper than my old ones too. I think the old ones were the blue box motives though. LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo http://www.currieenterprises.com/ins...MotiveGear.pdf
I just Googled and found these instructions, that say .008 to .012. It does seem like the last set I installed said .007 -.009. Maybe the instructions I found are older. Either way I knew they didnt say .006. Maybe it was when they switched manufacturing. I have wondered if running them tighter like the AAM gears would help noise. But, I have been afraid to try it. The 3.90 Motives I just installed are very quiet but have a slight whine on decel. Not very noticeable at all.
I have also had some sets that have the pinoin depth on the pinion and no back lash on the ring gear. Should always go by pattern but its still nice to have as a starting point.
Last edited by 96lt4c4; Jan 1, 2012 at 05:52 PM.
