8.5 gear pattern
Thread Starter
Teching In
Joined: Jun 2009
Posts: 19
Likes: 0
From: The dirty south, Southaven Mississippi
8.5 gear pattern Howdy guys.
I'm attempting to get my pattern set right myself. I can't say I'm enjoying it but hell, it can save me some money and it is a good learning experience.
I already know this pattern sucks, but I just wanted some opinion about where I should adjust to get the proper pattern.
It's motive 4.10 gears in a 8.5" 10 bolt.
I'm using a .020 pinion shim now, and backlash looked to be in the recommended .007 - .009 range but I may need to triple check and make adjustments.
Coast Side
Drive Side
I'm attempting to get my pattern set right myself. I can't say I'm enjoying it but hell, it can save me some money and it is a good learning experience.
I already know this pattern sucks, but I just wanted some opinion about where I should adjust to get the proper pattern.
It's motive 4.10 gears in a 8.5" 10 bolt.
I'm using a .020 pinion shim now, and backlash looked to be in the recommended .007 - .009 range but I may need to triple check and make adjustments.
Coast Side
Drive Side
Google: Yukon Gear Install manual, it's a PDF file and full of very useful info. Also this link has lots of good info, pay particular attention to the pic's and info about the pinion shim sitting on the pinion shaft fillet. I ran into this problem and it caused me alot of setup grief.
http://houstonperformancetrucks.com/...redmariner-%29
By your pattern it looks like the pinion is too deep, which I would not expect to be the case with a .020 shim. Maybe you are having the shim problem I mentioned above and your pinion bearing is not seated all the way?
http://houstonperformancetrucks.com/...redmariner-%29
By your pattern it looks like the pinion is too deep, which I would not expect to be the case with a .020 shim. Maybe you are having the shim problem I mentioned above and your pinion bearing is not seated all the way?
Pinion is too deep. Put a bigger pinion shim in it to pull it further back. Also, adjust the backlash again if needed. I would put around a 32-36, then adjsut from there as needed.
Thread Starter
Teching In
Joined: Jun 2009
Posts: 19
Likes: 0
From: The dirty south, Southaven Mississippi
Thanks for the input guys. It turns out my pinion shim wasn't sitting flush and after I read that article where the fillet problem is mentioned I learned that was a problem I was having. I ended up boring out the .020 shim to clear the fillet and I'm still running my previous backlash and this is what I came up with.
Coast Side
Drive Side
It still doesn't look right but it looks a lot better than the first pattern.
Coast Side
Drive Side
It still doesn't look right but it looks a lot better than the first pattern.
Thread Starter
Teching In
Joined: Jun 2009
Posts: 19
Likes: 0
From: The dirty south, Southaven Mississippi
But wouldn't that push the pinion closer to the ring gear? Like how it previously was when the shim/bearing wasn't flush? I thought from the new pattern I got that I might need to put a different pinion shim that's a hair smaller and perhaps nudge the backlash.
You are correct, it will move it toward the ring. After looking at your new pattern it looks way better than the first. Every 8.5 I have built has been a 30 shim or above. We use gm gears and sometimes motives if that's what the customer can afford.
Trending Topics
Thread Starter
Teching In
Joined: Jun 2009
Posts: 19
Likes: 0
From: The dirty south, Southaven Mississippi
Hmmmm, well if the information helps, I'm going from a 2.41 gear to a 4.10 and there is definitely a difference in the pinion head thickness of the two. The original 2.41 pinion had a .040 shim. It would make since that you could use a larger shim around the 30 range, but I would have to completely re adjust my backlash. I don't know, just trying to think outside the box.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Hmmmm, well if the information helps, I'm going from a 2.41 gear to a 4.10 and there is definitely a difference in the pinion head thickness of the two. The original 2.41 pinion had a .040 shim. It would make since that you could use a larger shim around the 30 range, but I would have to completely re adjust my backlash. I don't know, just trying to think outside the box.
