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  #61 (permalink)  
Old 03-10-2011, 10:29 AM
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Quote:
Originally Posted by TimoFinn
have you driven it yet?still noisy?
I am going to put it back together tonight, but I have my drive shaft in the shop to be checked and balanced if need be. I just want to rule it out.

I ran the Motives at .019 pinion on jack stands and it made noise, so I never drove it. I was also hearing a weird noise in the drive shaft while under the car listening. The conversion Chevy to ford u joint I installed is really tight so I am have a shop look at it. I have had stock drive shafts be bent .030 in the middle. Anyway, I pulled the center back out and went at it a little different this time. I checked the pattern and back lash as soon as I pulled it from the car. The backlash had closed up from .007 to .005. The pattern showed the pinion was to close the ring gear. I made a guess to try and move it too far out to figure out where the middle was. I knew .019 was too deep and figured out .025 was getting too far out. At .025 the pattern just started to run off the tooth. At .024 the pattern had paint above it and did not run off the tooth. What I did notice was that the further out I took the pinion the smoother and quieter the gears got turning them by hand. I also ran it with a drill this time and loaded the ring gear with my hand and it made the pattern show up a lot better. I now know that I need to be somewhere between .020 and .024. I think I am going to end up running it at .023. .024 has an acceptable pattern but is too close to .025 which does not. Also the ring gear has .006 back lash written on it and the Motive instructions say .007 to .009. I am going to run it at .023, set the lash to .006 per the Ford instructions and have a good drive shaft in it. If it still makes noise I am going to drive it off a cliff. I feel good about it this time and think that it will be quiet.

The Dr. is in the house.






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  #62 (permalink)  
Old 03-12-2011, 05:23 PM
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Pattern check. I had it at .023 with .006 lash and thought it looked good. So I tore it down and cleaned everything for final assembly. This time I set the lash the way the Ford manaul says to and tourqed the cap bolts to 80 ft/lbs. The pattern changed, the coast went up towards the heel and the drive towards the toe. I stuck .024 in it and the reajusted lash to .006 and the pattern centered back up. I have been running it with a drill and loading the ring gear with my hand to get the pattern. .025 and .026 seem to far out. This may may even be a little to far out. .019 to .022 seem to cause a diagnal line to shoot off the side of the drive pattern, this goes away at .023 and further out.

The gear feels choppy no matter where I put it.

.024 drive .006 lash


coast


.023 drive



.022 drive


Last edited by 96lt4c4; 03-12-2011 at 05:37 PM.
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  #63 (permalink)  
Old 03-12-2011, 05:58 PM
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.022 drive, you can see it starts to get deep and causes that straight line in the bottom of the tooth to be more noticeable.
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Old 03-12-2011, 06:45 PM
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I commend you, you have spent more time with this than most people would. You deserve to have work right and be quite.

Good luck
Vince
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  #65 (permalink)  
Old 03-12-2011, 06:55 PM
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Originally Posted by 302 Z28
I commend you, you have spent more time with this than most people would. You deserve to have work right and be quite.

Good luck
Vince

Thanks, well what do you think about my patterns? I cant make up my mind, I am about ready to take it to a guy that has a pinoin depth tool and see how close I am.
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Old 03-12-2011, 07:29 PM
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I like the .024 pattern the best. I think before you run it you need to get a pinion depth dimension to the center of the ring gear and see just for grins what that is.

Vince
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Old 03-12-2011, 08:55 PM
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I'd rather see the drive side a little closer to the toe, as it is going to move up the tooth under power. Maybe also backlash it a little tighter (.002") as an allowance for deflection in the aluminum case under power.

Deflection was also part of my consideration to go closer to the toe on the drive side.

Maybe Big Gear Head has some thoughts here??

On a steel spool with a nodular case I'd say you are pretty good, but I'm thinking some allowance needs to be made for the aluminum case.
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  #68 (permalink)  
Old 03-13-2011, 04:09 AM
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also i vote for .024 , it looks perfect

2x on kudos for sticking with it longer than most of us would
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Old 03-13-2011, 06:57 AM
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Thanks guys, If it still makes noise I am buying long tube headers Y pipe and a new catback for it. Then I wont hear it

Quote:
I'd rather see the drive side a little closer to the toe, as it is going to move up the tooth under power. Maybe also backlash it a little tighter (.002") as an allowance for deflection in the aluminum case under power.
Are you saying .002 tighter then .006 or .002 back lash.

I had it at .004 and the gear felt really smooth, but just thought it was way to tight. I know the AAM gears in my 7.5 10 bolt call for .004 lash. I will readjust it to .004 today and take some more pictures. I am not putting it back in till I fell 100% about it.
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Old 03-13-2011, 08:53 AM
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Quote:
Originally Posted by ericnova72
On a steel spool with a nodular case I'd say you are pretty good, but I'm thinking some allowance needs to be made for the aluminum case.

I do not have any experience with the aluminum case, but that recommendation makes sense.

Vince
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Old 03-13-2011, 12:14 PM
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I was thinking backlash at .004" as it will open up under power in the aluminum case.

I've never set up an aluminum case, just have read up on it so I'd know if I did run into one(I'm a knowledge sponge). Maybe contact the maker of the case and ask if there is any special considerations??
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Old 03-14-2011, 11:01 AM
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Quote:
Originally Posted by ericnova72
I was thinking backlash at .004" as it will open up under power in the aluminum case.

I've never set up an aluminum case, just have read up on it so I'd know if I did run into one(I'm a knowledge sponge). Maybe contact the maker of the case and ask if there is any special considerations??

Yukon really doesnt have a tech support line that I can find on thier web site.

I didnt get anything with the case either as far as instructions.
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  #73 (permalink)  
Old 03-14-2011, 12:24 PM
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Quote:
Originally Posted by 96lt4c4
Yukon really doesnt have a tech support line that I can find on thier web site.

I didnt get anything with the case either as far as instructions.
With that being a bolt thru case you dont need to run your backlash tight..
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  #74 (permalink)  
Old 03-21-2011, 08:26 PM
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Well I put it back in and it was the worst noise I have had yet. I finally gave in and took it to a local guy that works on nothing but old cars and has a lot of experience messing with the 9". I told him what I have been threw and done. He said it sounds like I am doing everything right.

After talking to him I decided to send the Motives back to Summitt and give the Yukon another try. I think I may have been setting the back lash to wide. The ring gear has .005/7 written on it. I was setting it around .008 to .010 going by the Yukon instructions. Tonight I threw it back together with the Yukon gear and set the lash tight to .005 and liked what I saw. I ended up with the .024 pinion shim and .005 lash. I will do final assembly on it this week. I also tried a little trick that I had read about. After I set the gear up where I thought it looked good, I put some valve grinding compound in the gear and ran it with a drill real slow for about 30 seconds. This took the shine off the gears and honed them. It should make the pattern show up a better. I had to make sure not to get it into the bearings. I will have to take a picture of the finish it left on the gears. They almost look like they haven’t been ran.
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  #75 (permalink)  
Old 03-24-2011, 09:18 AM
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Yukon is going back in the car, this time the back lash is .005 to .007 which is what is on the ring gear. I had it at .010 last time. I thnik this is going to be it.
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