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New Rear Gear Pattern **Update #4** #459471
09/04/09 11:22 PM 09/04/09 11:22 PM
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justinp61 Offline OP
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I am setting up my new gears for the Dart, 742, 8 3/4". Pinion depth calls for 2.717", it's at 2.7175", back lash is at .007", 25# pre load on the pinion, new gears.

Drive side. New, I added a .010" shim to the pinion. Now what?

5463075-IMG_1875.JPG (135 downloads)
Last edited by justinp61; 09/07/09 12:49 PM.
Re: New Rear Gear Pattern [Re: justinp61] #459472
09/04/09 11:23 PM 09/04/09 11:23 PM
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justinp61 Offline OP
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Coast side.

New

5463076-IMG_1876.JPG (131 downloads)
Last edited by justinp61; 09/05/09 01:21 PM.
Re: New Rear Gear Pattern [Re: justinp61] #459473
09/04/09 11:24 PM 09/04/09 11:24 PM
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justinp61 Offline OP
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Guide patterns. Am I ok?

5463078-IMG_1868.JPG (105 downloads)
Re: New Rear Gear Pattern [Re: justinp61] #459474
09/05/09 12:06 AM 09/05/09 12:06 AM
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I'm not sure I would be happy with that. I think I had the gears in and out of my Dana 5 times before I was happy with the pattern. Set up bearings are awesome.
Re: New Rear Gear Pattern [Re: justinp61] #459475
09/05/09 12:09 AM 09/05/09 12:09 AM
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Don't rely on the gauge. The contact pattern is everything. Look at the shape of the pattern. An ideal pattern is wide, with soft rounded edges. It should not look like a knife blade.

Pinion is too far away. Try 0.010" thicker shim then post the result.

Contact info
Re: New Rear Gear Pattern [Re: DoctorDiff] #459476
09/05/09 12:32 AM 09/05/09 12:32 AM
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justinp61 Offline OP
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Thanks Cass, I'll take it apart tomorrow AM and reset the pinion depth. Brian, you're right on the set up bearings, I just hate to spend $60 on something I won't use for a long time.

Justin
Re: New Rear Gear Pattern [Re: DoctorDiff] #459477
09/05/09 12:36 AM 09/05/09 12:36 AM
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Quote:

An ideal pattern is wide, with soft rounded edges. It should not look like a knife blade.

Pinion is too far away. Try 0.010" thicker shim then post the result.



Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: New Rear Gear Pattern [Re: justinp61] #459478
09/05/09 07:45 AM 09/05/09 07:45 AM
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Andrews,In. U.S.of A.
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Make it look like the upper right pic.
Re: New Rear Gear Pattern [Re: 67_Satellite] #459479
09/05/09 09:21 AM 09/05/09 09:21 AM
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That set up wouldnt last too long under good power, Im sure it would be noisy on the coast side too.
I sgree with the upper right picture in the manual. .010 thou spacer probably will get ya there. I had my dads dana in and out probbably 6-7 times. I even had the factory dodge scooter block, and pinion depth tools.

What a pain..

Kasey
Re: New Rear Gear Pattern [Re: 67_Satellite] #459480
09/05/09 12:36 PM 09/05/09 12:36 PM
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Quote:

Make it look like the upper right pic.

Or even shoot for the upper left... under power it wil go closer to the right pic...
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459481
09/05/09 01:58 PM 09/05/09 01:58 PM
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Add 0.010" more.

What is your total shim pack thickness? 742 castings usually set up around 0.090"

Contact info
Re: New Rear Gear Pattern **New Photos** [Re: DoctorDiff] #459482
09/05/09 06:31 PM 09/05/09 06:31 PM
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justinp61 Offline OP
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Cass. it's a 742. It's now at .7896, .008 bl, 20"# pre load on the pinion.

5464370-IMG_1878.JPG (93 downloads)
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459483
09/05/09 06:32 PM 09/05/09 06:32 PM
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justinp61 Offline OP
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Coast.

5464371-IMG_1880.JPG (95 downloads)
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459484
09/05/09 06:34 PM 09/05/09 06:34 PM
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rickstershemi Offline
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Getting better a smidge more ought to do it...fun huh

Rickster
Re: New Rear Gear Pattern **New Photos** [Re: rickstershemi] #459485
09/05/09 06:46 PM 09/05/09 06:46 PM
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Quote:

Getting better a smidge more ought to do it...fun huh

Rickster



Re: New Rear Gear Pattern **New Photos** [Re: rickstershemi] #459486
09/05/09 06:49 PM 09/05/09 06:49 PM
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justinp61 Offline OP
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Quote:

Getting better a smidge more ought to do it...fun huh

Rickster



It's been almost more fun than I can stand. It took an hour to get the pre load right. I had to walk away from it for a while . Plus my brother was changing the steering box on his diesel so had to help him too. I'm thinking about putting .020" in it and checking again. It sure is a burden being born stupid (me).
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459487
09/05/09 06:52 PM 09/05/09 06:52 PM
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Quote:

Quote:

Getting better a smidge more ought to do it...fun huh

Rickster



It's been almost more fun than I can stand. It took an hour to get the pre load right. I had to walk away from it for a while . Plus my brother was changing the steering box on his diesel so had to help him too. I'm thinking about putting .020" in it and checking again. It sure is a burden being born stupid (me).



You'll get it....taint fun....

Rickster
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459488
09/05/09 08:02 PM 09/05/09 08:02 PM
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Polson, MT
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Don't set the preload until you get the pattern right. Otherwise, you must constantly juggle preload shims.

I would try another 0.010". If that is too much, I would decrese the pack 0.005"

Contact info
Re: New Rear Gear Pattern **New Photos** [Re: DoctorDiff] #459489
09/05/09 09:32 PM 09/05/09 09:32 PM
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justinp61 Offline OP
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Ok, last time tonight, .087" shim pack, .010" bl.

5464671-IMG_1881.JPG (97 downloads)
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459490
09/05/09 09:33 PM 09/05/09 09:33 PM
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justinp61 Offline OP
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Somebody shoot me.

5464675-IMG_1882.JPG (101 downloads)
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459491
09/05/09 09:41 PM 09/05/09 09:41 PM
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more

Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459492
09/05/09 09:48 PM 09/05/09 09:48 PM
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S/ST 3040 Offline
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Are you getting paid by the hour?














I'm just kidding..............010" more.
Re: New Rear Gear Pattern **New Photos** [Re: S/ST 3040] #459493
09/05/09 09:51 PM 09/05/09 09:51 PM
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justinp61 Offline OP
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Quote:

Are you getting paid by the hour?



The labor is the cheapest thing on this job.
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459494
09/05/09 09:54 PM 09/05/09 09:54 PM
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Rather be in Fallon, Nevada
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Yer almost there

Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459495
09/05/09 09:55 PM 09/05/09 09:55 PM
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Polson, MT
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Yep, try 0.010" more.

You should be getting close.

Contact info
Re: New Rear Gear Pattern **New Photos** [Re: DoctorDiff] #459496
09/05/09 10:11 PM 09/05/09 10:11 PM
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Lubbock,TX
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Keeper,thanks!
Re: New Rear Gear Pattern **New Photos** [Re: DavidDean] #459497
09/05/09 10:34 PM 09/05/09 10:34 PM
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justinp61 Offline OP
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Tomorrow is a new day . Before church I'll pull it apart and go again. Some of you know I broke the previous gear set. When I tore it down I found some interesting stuff. The (chevy) guy who set it up runs a repair shop and some very fast nitrous cars, low 5s, high 4s in the 1/8 mile. The rear pinion bearing had been clearenced with a burr and would slide on and off the pinion with no resistance. The pinion showed signs of movement in the rear bearing, also and the pinion depth shims were crushed to the point one was in two pieces and another was broken, all were distorted. This is why I'm learning to do it myself.

Thanks guys for you're patience and advice .
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459498
09/06/09 02:28 AM 09/06/09 02:28 AM
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i think i still have my set up bearings somewhere. you should have yelled to use them. your welcome to them
Re: New Rear Gear Pattern **New Photos** [Re: 68roadrunner] #459499
09/06/09 09:14 AM 09/06/09 09:14 AM
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justinp61 Offline OP
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Quote:

i think i still have my set up bearings somewhere. you should have yelled to use them. your welcome to them




Thanks . Hopefully I'm almost there.
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459500
09/06/09 10:39 AM 09/06/09 10:39 AM
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Ohio
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What pinion setter you using?
that far off from initial indication?
calibration or cleanliness issue on initial reading?
A bit agravating to redo many times but its good learning process, looking close to good.
Re: New Rear Gear Pattern **New Photos** [Re: theclutcher] #459501
09/06/09 06:49 PM 09/06/09 06:49 PM
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justinp61 Offline OP
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SOS different day.

5466128-IMG_1883.JPG (84 downloads)
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459502
09/06/09 06:50 PM 09/06/09 06:50 PM
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Another.

5466130-IMG_1885.JPG (90 downloads)
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459503
09/06/09 06:50 PM 09/06/09 06:50 PM
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Rickster
Re: New Rear Gear Pattern **New Photos** [Re: rickstershemi] #459504
09/06/09 06:52 PM 09/06/09 06:52 PM
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On the south side of Nowhere
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Re: New Rear Gear Pattern **New Photos** [Re: S/ST 3040] #459505
09/06/09 07:09 PM 09/06/09 07:09 PM
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that should work, pull and coast sides back to back , and slightly to the inside.

lets see if you can break it again.

Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459506
09/06/09 09:20 PM 09/06/09 09:20 PM
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Polson, MT
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I would decrease shim pack thickness 0.003".

Contact info
Re: New Rear Gear Pattern **New Photos** [Re: DoctorDiff] #459507
09/06/09 10:45 PM 09/06/09 10:45 PM
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Rather be in Fallon, Nevada
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Quote:

I would decrease shim pack thickness 0.003".




Re: New Rear Gear Pattern **New Photos** [Re: DoctorDiff] #459508
09/06/09 11:38 PM 09/06/09 11:38 PM
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justinp61 Offline OP
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Quote:

I would decrease shim pack thickness 0.003".



You're killing me Cass .

Thanks, Justin
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459509
09/07/09 12:50 PM 09/07/09 12:50 PM
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justinp61 Offline OP
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Just for you Cass , .003 out.

5467704-IMG_1888.JPG (54 downloads)
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459510
09/07/09 12:51 PM 09/07/09 12:51 PM
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justinp61 Offline OP
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Drive.

5467709-IMG_1889.JPG (77 downloads)
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459511
09/07/09 12:56 PM 09/07/09 12:56 PM
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You are getting better at making a visible pattern.

Put that .003" back.

Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459512
09/07/09 12:58 PM 09/07/09 12:58 PM
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Polson, MT
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What is your backlash? You may want to increase it 1 notch.

Contact info
Re: New Rear Gear Pattern **New Photos** [Re: DoctorDiff] #459513
09/07/09 01:04 PM 09/07/09 01:04 PM
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justinp61 Offline OP
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Quote:

What is your backlash? You may want to increase it 1 notch.



.009".
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459514
09/07/09 01:22 PM 09/07/09 01:22 PM
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Polson, MT
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Sounds like your good to go if the pattern is pretty consistant all the way around.

Contact info
Re: New Rear Gear Pattern **New Photos** [Re: DoctorDiff] #459515
09/07/09 01:29 PM 09/07/09 01:29 PM
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justinp61 Offline OP
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Cass, it looks pretty good in all three places I checked it. I had bl backed up one notch and it was .013"-.014".
Re: New Rear Gear Pattern **New Photos** [Re: justinp61] #459516
09/07/09 01:59 PM 09/07/09 01:59 PM
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Polson, MT
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Sounds like 0.009" backlash is the way to go.

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