Copy Original Pattern On Used Ring & Pinion Even If Not Ideal? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**'68OrangeSunshine** · 06-11-2022, 04:20 PM

Hi PJ. Boy that's a lot of business, but you saved $1200 bucks.
The differential shop gave me a detailed break-in protocol -- several 20 mile runs, punctuated with 30 minute cool downs. Just running 3 miles to the supermarket and back won't do, they said.

**pjmoreland** · 06-11-2022, 04:25 PM

Quote:

Originally Posted by '68OrangeSunshine

Hi PJ. Boy that's a lot of business, but you saved $1200 bucks.
The differential shop gave me a detailed break-in protocol -- several 20 mile runs, punctuated with 30 minute cool downs. Just running 3 miles to the supermarket and back won't do, they said.

I can see why they charge that much. It is a time-consuming job. I spent in the ballpark of $400 on axles, bearings, seals and shims. The gears were free, thanks to 72again4x4.

**'68OrangeSunshine** · 06-11-2022, 04:35 PM

Quote:

Originally Posted by pjmoreland

I can see why they charge that much. It is a time-consuming job. I spent in the ballpark of $400 on axles, bearings, seals and shims. The gears were free, thanks to 72again4x4.

This is a great group, on this Board.
Guys give you free stuff. Just pay shipping.
Once, I sent some L6 Manifold hold down widgets to a guy in Central CA, and got stiffed on the shipping reimbursement, but I heard he got hit with medical issues, so I didn't get too bent out of shape. Other members have restored my Faith in Humanity.
It's all good.

**pjmoreland** · 06-11-2022, 04:37 PM

Agreed!

**'68OrangeSunshine** · 06-11-2022, 05:38 PM

I _should_ go out and work on my Stepside project instead of goofing off on the internet inside under the swamp cooler, but it's 106* and Sunny w/ a 3 knot wind gusting to 6.
Actually, that's perfect spraypaint weather.

**pjmoreland** · 06-11-2022, 05:57 PM

Sounds challenging to keep your sweat from dripping on the paint

**'68OrangeSunshine** · 06-11-2022, 06:12 PM

Quote:

Originally Posted by pjmoreland

Sounds challenging to keep your sweat from dripping on the paint

Shoot on an angle no sweat.
I may get arounf to it. At least shoot the Panhard Bar...
After a bowl of pistachio ice cream.

**WorldsCrappiestTruck** · Yesterday, 06:31 PM

This thread was well-attended - I’m hoping for some knowledgeable recommendations on wear pattern for my 12 bolt.

In hindsight I should have put marking on it before disassembly but alas….

3.73’s / Eaton Truetrac, new Motive axles.

On install, I R&R’d the carrier a hundred times with the pinion depth scribed on the pinion, and just couldn’t get a pattern I liked with appropriate backlash.

I added a 0.010” pinion shim, which pushes the pinion toward the carrier.

I set backlash to its minimum (I honestly forget what it was, but I set it to the minimum spec expecting new parts would wear together and get me a little slop.

It turns out the diff whines on acceleration at about 40-55mph, no noise on deceleration, no slop or “clink” when I tap the gas. I think it’s too “tight” either in backlash or pinion depth. The wear pattern looks weird too on the pinion, like spotted?

Judging from what you see (and I can take more photos), what does your gut tell you? Thanks for any pro advice 😎

06-11-2022, 04:20 PM	#26
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,564	Re: Copy Original Pattern On Used Ring & Pinion Even If Not Ideal? Hi PJ. Boy that's a lot of business, but you saved $1200 bucks. The differential shop gave me a detailed break-in protocol -- several 20 mile runs, punctuated with 30 minute cool downs. Just running 3 miles to the supermarket and back won't do, they said. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

06-11-2022, 04:37 PM	#29
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 6,067	Re: Copy Original Pattern On Used Ring & Pinion Even If Not Ideal? Agreed!

06-11-2022, 05:38 PM	#30
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,564	Re: Copy Original Pattern On Used Ring & Pinion Even If Not Ideal? I _should_ go out and work on my Stepside project instead of goofing off on the internet inside under the swamp cooler, but it's 106* and Sunny w/ a 3 knot wind gusting to 6. Actually, that's perfect spraypaint weather. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

06-11-2022, 05:57 PM	#31
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 6,067	Re: Copy Original Pattern On Used Ring & Pinion Even If Not Ideal? Sounds challenging to keep your sweat from dripping on the paint

Yesterday, 06:31 PM	#33
WorldsCrappiestTruck Active Member Join Date: Mar 2022 Location: Hinesburg Vermont Posts: 159	Re: Copy Original Pattern On Used Ring & Pinion Even If Not Ideal? This thread was well-attended - I’m hoping for some knowledgeable recommendations on wear pattern for my 12 bolt. In hindsight I should have put marking on it before disassembly but alas…. 3.73’s / Eaton Truetrac, new Motive axles. On install, I R&R’d the carrier a hundred times with the pinion depth scribed on the pinion, and just couldn’t get a pattern I liked with appropriate backlash. I added a 0.010” pinion shim, which pushes the pinion toward the carrier. I set backlash to its minimum (I honestly forget what it was, but I set it to the minimum spec expecting new parts would wear together and get me a little slop. It turns out the diff whines on acceleration at about 40-55mph, no noise on deceleration, no slop or “clink” when I tap the gas. I think it’s too “tight” either in backlash or pinion depth. The wear pattern looks weird too on the pinion, like spotted? Judging from what you see (and I can take more photos), what does your gut tell you? Thanks for any pro advice 😎 Attached Images



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