Proform 66668 Diff Cover

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Schurkey

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You obviously want to blow a bunch of money on a part you don't actually need; and you're hot to "justify" your decision even though you're torturing logic to do so.

It's your money. The manufacturer and the shipping company thank you for your support.

If you think your application is stressful enough to benefit from that part...you're wildly mistaken. What you need to be concerned about is the "usual" failure points of the 8.5; and the bearing caps aren't really a part of that until you put slicks and a bigger engine on the vehicle.

The best way to "fix" the weak points of the 8.5 is to replace it with a 9.5. And other than needing a conversion U-joint, it can be a bolt-in swap with essentially no fabricating.
 

Supercharged111

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You obviously want to blow a bunch of money on a part you don't actually need; and you're hot to "justify" your decision even though you're torturing logic to do so.

It's your money. The manufacturer and the shipping company thank you for your support.

If you think your application is stressful enough to benefit from that part...you're wildly mistaken. What you need to be concerned about is the "usual" failure points of the 8.5; and the bearing caps aren't really a part of that until you put slicks and a bigger engine on the vehicle.

The best way to "fix" the weak points of the 8.5 is to replace it with a 9.5. And other than needing a conversion U-joint, it can be a bolt-in swap with essentially no fabricating.

This. You, like many others OP, don't beat your truck nearly as hard as you think you do. Towing a 10,000# enclosed trailer 100 miles is MUCH harder on equipment than a weak ass 1 wheel burnout.
 

BOOT

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Never said it was gonna be a one wheel peeler LOL Comparing long term wear is a totally different discussion than my intended use.

You guys are obviously done arguing your point and just butthurt. I've explained my reasons and if you want to continue to post nonsense go right ahead. This is not the first forum I've been a member of, seen this many times, nothing of real value to add about the ORIGINAL QUESTION and just wanna waste time huffing and puffing.
 

Supercharged111

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Never said it was gonna be a one wheel peeler LOL Comparing long term wear is a totally different discussion than my intended use.

You guys are obviously done arguing your point and just butthurt. I've explained my reasons and if you want to continue to post nonsense go right ahead. This is not the first forum I've been a member of, seen this many times, nothing of real value to add about the ORIGINAL QUESTION and just wanna waste time huffing and puffing.

The only huffing and puffing is you blowing your money on this worthless part. The real mind blower is how you fail to understand how aerated oil fails to lubricate and pull heat out of pinion bearings. Have fun blowing your money and realizing zero gains.
 

Erik the Awful

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Check with a race-team and see how often they service fluids
We endurance race. I think we put quality synthetic gear lube in our BMW when we first got it. We haven't had any rear end failures, so it's not a regular maintenance thing. Our team is geographically separated, so most of the between-race maintenance is handled by two team members. If we could get the clutch to hold together, we might take the time to do recreational maintenance.
 

Schurkey

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Damn, lotta hate for dude that just wants a new diff cover lol.
No. We don't hate him. We are trying to look out for him, seeing that he's about to make a mistake and warning him that what he's planning is not a good move. It's "style" over "substance". Most of his argument in favor of the diff cover is about "strength" and "lack of distortion"; but he's choosing the silliest way to gain strength and reduce distortion--it's more like polishing a turd. The 8.5 axle is inherently not as strong as the 9.5; and it's SO EASY to "fix" the real mistake GM made.

But in the end, it's his time, money, effort, and enthusiasm to waste. He's been warned and advised, now he's going to make his decision with some facts to consider.

It's a public service.

I would get it because it just looks good! lol Why would anyone buy aluminum valve covers if not for appearance.
Better gasket surface, less distortion on the gasket surface, and some amount of noise-damping. "Looking good" is the side effect, not the main purpose.
 

Knuckle Dragger

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No. We don't hate him. We are trying to look out for him, seeing that he's about to make a mistake and warning him that what he's planning is not a good move. It's "style" over "substance". Most of his argument in favor of the diff cover is about "strength" and "lack of distortion"; but he's choosing the silliest way to gain strength and reduce distortion--it's more like polishing a turd. The 8.5 axle is inherently not as strong as the 9.5; and it's SO EASY to "fix" the real mistake GM made.

But in the end, it's his time, money, effort, and enthusiasm to waste. He's been warned and advised, now he's going to make his decision with some facts to consider.

It's a public service.

Glad you're here to save the internet one post at a time man. Opinions don't equal facts though...............
 
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