Are c3 vette ring & pinion different than GMs of the same area?
#1
Are c3 vette ring & pinion different than GMs of the same area?
I have searched for about an hour can't find my answer. Maybe the wrong words?
I'm going to need to replace the ring and pinion on a 1971 C3 due to 10K miles of hard road coarse miles. It is whining really bad under a mild load only. I have not pulled it yet, so not sure what year the rear is. One of my questions is, Are the 70ish vette rear diff sets different than say a standard GM 10 bolt or 12 bolt?
What I have read is it looks like it going to be hard to find a set also, is this still the case?
I'm going to need to replace the ring and pinion on a 1971 C3 due to 10K miles of hard road coarse miles. It is whining really bad under a mild load only. I have not pulled it yet, so not sure what year the rear is. One of my questions is, Are the 70ish vette rear diff sets different than say a standard GM 10 bolt or 12 bolt?
What I have read is it looks like it going to be hard to find a set also, is this still the case?
#3
Tech Contributor
Yes they are specific to corvette only- 63-79 all use the same type. USA made are gone, as a result prices have doubled or tripled from Yukon, Motive, or Richmond. Nitrogear doesn't say where they're made, so you think if usa made that would be out there. Some others rebox or get the gears from those 3 and put their name on them. So, you can see prices from $265- close to $800 for imported gears. 10k miles should not have worn out the gears, unless they were possibly setup wrong or just bad gears. There is another company, US Standard Gear, sounds impressive but they are made by Yukon and don't meet the standards of Yukon so they are sold as US Standard Gears, according to information about them online.
What ratio are you looking for and how are you going to build it?
What ratio are you looking for and how are you going to build it?
#4
Thanks for the replies and clearing things up for me. I plan on staying with what is in it now. Which looks to be 3.70 ish, not sure until I remove it. It is in a road course car that has 10K track confirmed track miles put on it since 2016. We had planned on putting it back to stock specs. I heard a new odd sound from the back last weekend in the straight away a few times. I am concerned about the integrity of the diff so it's coming out.
#5
Tech Contributor
I would polish, tune and mill the posi. Send out the internals for cryo treating and use ARP Rg bolts at a minimum.
#6
I didn't find anything super scary in there. Just really worn R&P gears and lots of what I'd call metal dust. There was at least 1/4 inch of backlash (yes 1/4 inch). The dust was so small you couldn't feel it. But it sticks to a magnet. It appears to have been a rebuilt unit. The previous owner would have taken it straight to the track and not taken the time to break it in. Can side yoke bearing and seals be put in after the carrier is installed? Or is it best to install them before it is installed?
#7
Tech Contributor
I didn't find anything super scary in there. Just really worn R&P gears and lots of what I'd call metal dust. There was at least 1/4 inch of backlash (yes 1/4 inch). The dust was so small you couldn't feel it. But it sticks to a magnet. It appears to have been a rebuilt unit. The previous owner would have taken it straight to the track and not taken the time to break it in. Can side yoke bearing and seals be put in after the carrier is installed? Or is it best to install them before it is installed?
#8