With all the discussion about differentials?
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
With all the discussion about differentials?
Back in the day when I had my original 79 3.55 gear yokes got so ground away that it trashed the rear end before I put 50,000 miles on my new car. Then I bought what I thought was the super build with 4.11 richmond gears and custom and hardened yokes. The next problem was posi cases failing about every year or two. I went to Tom's best stuff.
But another item that has never been brought up....... Is the Heavy duty differential cover. I bought one and polished out the inside. It is a beefy unit with substantially bigger thicker casting and spring bolt sizes.
The question is: Does the heavy cover add that much more total strength because I have had Zero problems with big slicks and lot's of HP?
But another item that has never been brought up....... Is the Heavy duty differential cover. I bought one and polished out the inside. It is a beefy unit with substantially bigger thicker casting and spring bolt sizes.
The question is: Does the heavy cover add that much more total strength because I have had Zero problems with big slicks and lot's of HP?
NCM Grand Opening Veteran
Joined: Sep 2005
Posts: 20,979
Likes: 384
From: South of giving a damn
St. Jude Donor '11, '17
I think it was a solution looking for a problem, but I like mine mine, looks cool and I wanted to support he good people at Muskegon Brakes.
Racer
Joined: Jan 2017
Posts: 496
Likes: 153
From: San Francisco Bay Area
Back in the day when I had my original 79 3.55 gear yokes got so ground away that it trashed the rear end before I put 50,000 miles on my new car. Then I bought what I thought was the super build with 4.11 richmond gears and custom and hardened yokes. The next problem was posi cases failing about every year or two. I went to Tom's best stuff.
But another item that has never been brought up....... Is the Heavy duty differential cover. I bought one and polished out the inside. It is a beefy unit with substantially bigger thicker casting and spring bolt sizes.
The question is: Does the heavy cover add that much more total strength because I have had Zero problems with big slicks and lot's of HP?
But another item that has never been brought up....... Is the Heavy duty differential cover. I bought one and polished out the inside. It is a beefy unit with substantially bigger thicker casting and spring bolt sizes.
The question is: Does the heavy cover add that much more total strength because I have had Zero problems with big slicks and lot's of HP?
Tech Contributor
Joined: Aug 1999
Posts: 15,166
Likes: 3,968
From: Connecticut, USA
The Muskegon Covers are very good, better then the knockoffs of them that are sold. The main reason for them is the thicker ears so they don't crack like the stock covers do. The flange is thicker as well so the bolt depth should be checked for thread engagement. Beyond that not much more strength. I use a lot of them and think they are the best. Some of the knockoffs I have been sent in the past had issues with the bolt hole placement where I had to mill the covers to allow a socket to fit the bolt.
Race Director
Joined: Jan 2007
Posts: 10,673
Likes: 696
From: Danville Illinois
2025 Corvette of the Year Finalist - Modified
2024 C3 of the Year Winner - Modified
2021 C3 of the Year Finalist - Modified
2019 C3 of Year Finalist (appearance mods)
My ears where cracked on my 75 and a member on here saw a Muskegon Cover for ? i cant remember the price at an Indy swap meet, he called me and i said get it.
Compared to original, yes, it looked bigger/better than what i had, got it installed, no problems.
I have no idea how i cracked the ears.
Compared to original, yes, it looked bigger/better than what i had, got it installed, no problems.
I have no idea how i cracked the ears.
Last edited by Mod75; Jan 26, 2021 at 10:16 AM.
Le Mans Master
Joined: May 2008
Posts: 9,063
Likes: 2,736
2022 C3 of the Year Finalist - Modified
I suspect the ears get cracked by over-tightening the spring attach bolts. My 69 cover had some "reinforcements" welded to it, and the spare cover I got had bad threads in one of the ears,.....so I bought the Muskegon cover (the word Muskegon is cast into back side of cover). Hopefully the fact that Muskegon is cast into the cover means I got the real thing.....as opposed to the cheaper knockoffs.
