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Help setting up a used 8 3/4" gear pattern #1204218 03/26/12 10:35 PM 03/26/12 10:35 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster OP master
dizuster OP master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	Hey Guys, I'm trying to set up a USED 3.23 gear in my 8 3/4". It's a 489 case with the crush sleeve eliminator. Right now backlash is set at .009" (I know... little loose) because that seemed to give me the best pattern. Check out the pattern I have. If you look on the drive side, it looks like the pinion is a little to close (pattern shows tip diving into root of gear as it gets towards the heel). But if I look at the coast side, it looks like the pinion is a little too far away (Tip of pattern is diving away from the root as it gets towards the toe). If I try to move the pinion in one way or the other, it just makes the coast better and the drive side worst, or the other way around. It never seems to bring both in line. To get the picture I applied pressure to the ring gear (via screw driver) when I rolled it over to make sure it had some drag on it to get a good reading. Any thoughts? 7137212-2012-03-26_20-20-26_495(800x451).jpg (191 downloads)

Re: Help setting up a used 8 3/4" gear pattern [Re: dizuster] #1204219 03/26/12 10:35 PM 03/26/12 10:35 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster OP master
dizuster OP master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	coast 7137213-2012-03-26_20-21-42_594(800x451).jpg (189 downloads)

Re: Help setting up a used 8 3/4" gear pattern [Re: dizuster] #1204220 03/26/12 10:36 PM 03/26/12 10:36 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster OP master
dizuster OP master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	Drive 7137220-2012-03-26_20-21-15_463(800x451).jpg (197 downloads)

Re: Help setting up a used 8 3/4" gear pattern [Re: dizuster] #1204221 03/26/12 10:37 PM 03/26/12 10:37 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster OP master
dizuster OP master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	Coast 2 7137225-2012-03-26_20-20-58_425(800x451).jpg (157 downloads)

Re: Help setting up a used 8 3/4" gear pattern [Re: dizuster] #1204222 03/26/12 10:48 PM 03/26/12 10:48 PM
Joined: Mar 2005 Posts: 862 Iowa State fan kilroy super stock
kilroy super stock Joined: Mar 2005 Posts: 862 Iowa State fan	More pinion shims to move it back into the teeth, then adjust lash and contact pattern? Last edited by kilroy; 03/26/12 10:49 PM. 1973 Charger, former SE, former auto I'm not trying to be difficult, it comes naturally....

Re: Help setting up a used 8 3/4" gear pattern [Re: kilroy] #1204223 03/27/12 07:52 AM 03/27/12 07:52 AM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster OP master
dizuster OP master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	Well if I move the pinion closer, it just makes the drive side into the root further, and makes the coast side fall off the gear worse at the same time. This is sort of a happy medium...

Re: Help setting up a used 8 3/4" gear pattern [Re: kilroy] #1204224 03/27/12 08:20 PM 03/27/12 08:20 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster OP master
dizuster OP master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	Bump for the night crew?

Re: Help setting up a used 8 3/4" gear pattern [Re: dizuster] #1204225 03/27/12 08:51 PM 03/27/12 08:51 PM
Joined: Feb 2007 Posts: 5,080 organ M maximum entropy master
maximum entropy master M Joined: Feb 2007 Posts: 5,080 organ	looks like inadequate pinion depth, and too much lash. for what is the good life if not doing things thoughtfully?

Re: Help setting up a used 8 3/4" gear pattern [Re: maximum entropy] #1204226 03/27/12 09:11 PM 03/27/12 09:11 PM
Joined: May 2007 Posts: 64 Airville Pa. B boomer member
boomer member B Joined: May 2007 Posts: 64 Airville Pa.	You may want to try to open the backlash up some more. Used gears wear and are usually around .011-.013 Had to redo my 8 3/4 set due to a bad pinion bearing and my best gear pattern was when my final backlash was set at .015......

Re: Help setting up a used 8 3/4" gear pattern [Re: maximum entropy] #1204227 03/27/12 09:11 PM 03/27/12 09:11 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster OP master
dizuster OP master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	Inadequate pinion depth meaning it's too deep or not deep enough? From the drive side, my uneducated opinion is that I can't go too much deeper because it'll be in the root of the ring gear tooth? Could you explain why you think that?

Re: Help setting up a used 8 3/4" gear pattern [Re: dizuster] #1204228 03/27/12 10:36 PM 03/27/12 10:36 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster OP master
dizuster OP master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	Opened up the backlash to .012" Drive side looks better, but coast side looks the same. From what I understand, if there is a pinion depth problem, shouldn't the patterns be opposite of eachother? For example, if the drive side is down at the toe and falling into the heel, wouldn't the coast side show that it would be falling away towards the tip? In this case, both patterns are falling into the root? 7138738-2012-03-27_21-27-35_177(800x451).jpg (138 downloads)

Re: Help setting up a used 8 3/4" gear pattern [Re: dizuster] #1204229 03/27/12 10:36 PM 03/27/12 10:36 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster OP master
dizuster OP master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	Coast. 7138739-2012-03-27_21-28-04_470(800x451).jpg (152 downloads)

Re: Help setting up a used 8 3/4" gear pattern [Re: dizuster] #1204230 03/28/12 03:40 PM 03/28/12 03:40 PM
Joined: Feb 2007 Posts: 5,080 organ M maximum entropy master
maximum entropy master M Joined: Feb 2007 Posts: 5,080 organ	more pinion depth would move the pinion toward the front of the car. for what is the good life if not doing things thoughtfully?

Re: Help setting up a used 8 3/4" gear pattern [Re: maximum entropy] #1204231 03/28/12 04:04 PM 03/28/12 04:04 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	See if this dont help some. http://www.drivetrain.com/parts_catalog/...structions.html I would take some shim out as to move the pinion towards the front of the car. It should set the drive side deeper and then you will have to set backlash from there to see where the cost pattern comes out. Good luck , Ron

Re: Help setting up a used 8 3/4" gear pattern [Re: 383man] #1204232 03/29/12 03:03 PM 03/29/12 03:03 PM
Joined: Jan 2003 Posts: 4,395 The Pale Blue Dot Skeptic master
Skeptic master Joined: Jan 2003 Posts: 4,395 The Pale Blue Dot	Set the drive side up to where it's best and let the coast side be, if it's noisy on coast so what You are probably gonna have some noise with used gears and under power you want the teeth to mesh best

Re: Help setting up a used 8 3/4" gear pattern [Re: Skeptic] #1204233 03/29/12 07:13 PM 03/29/12 07:13 PM
Joined: Mar 2008 Posts: 553 Kentucky clovis mopar
clovis mopar Joined: Mar 2008 Posts: 553 Kentucky	Used gears usually set up better between .008"-.010" backlash. Also for used gears concentrate on the coast side. Trying to chase it from the drive side can become extremely frustrating-just went through this with my Dana. http://www.ringpinion.com/Content/HowTo/...nstructions.pdf '75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119 "For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"

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