wcgreen

Hi! I am based out of Jax, FL where my wife and daughter are, but I'm currently in grad school in Tuscaloosa and just got a 1977 Vette. Was on a bike and totalled it in Pcola returning for the fall. Rather than get a used Honda Civic with 80K on it, I got a VERY nice black on red, 68K Vette instead as my daily driver. Solid car.

I got a sound in the back end 2 weeks after getting the car and two local folks in Tuscaloosa just say its wheel bearings. Well, it could be aggravating it, but It sounds more like a rotor brushing on the guard. It only happens on turns, and usually only when the rear end is lower than the front, turning out of a lot, or on some of the hills here in Alabama... a whump, whump, whump and then gone after the turn. Any good folks in Jax to do a break check, maybe bearings and bushings in December? The mechanics here don't want to deal with it and are avoiding me. Thoughts?

Back in Jax, I live next door to a family that owns a mechanic shop.. they are super nice, Armenian, and drive nice Benzes and BMWs... they worked on my f150. I mentioned what I needed looked at and possibly done and they are offering to do it.. However, do I need to only find a vette specialist for this, or is this something a good mechanic can handle? I appreciate your thoughts!
Billy

Wee

Sounds like it might need the rear differential oil changed...Don't forget the posi-limited slip additive. Maybe it's only the clutches grabbing.

Brian

Sluefoot

I agree....I would drain the differential...probably have to siphon all of it out that you can...then put in some new gear lube....put in TWO 4 oz. bottles of GM differential lube, A DEFINITE REQUIREMENT....then top off with more gear lube.....do quite a few figure-8's...both in forward and reverse, and you'll more than likely have cured the noise!!

SRQStingray

Same problem with my 71. I'm have diff fluid changed out. I was told there is an additive that goes into diff.

MelWff

you have two threads going with the same topic, did you look at the other thread

https://www.corvetteforum.com/forums...-question.html

OLE442

Yeah, I had the same issue with mine. It was my cousin's car and it sat pretty much for a year after he passed away. I pulled out the gear lube, added new gear lube with 2 bottles of the GM positraction additive, did some figure 8's and it appears to have gone away!

croaker

Prolly needs oil changed back there anyway do that first. See what happens

wcgreen

Thanks folks! I will see if that does the trick first!

wcgreen

FIXED! I took it in and had the differential lub done... immediately fixed! I told the seller and he was baffled because he said he changed it out himself and asked if they added the limited slip additive. The shop told me they did and used BP products. Whatever, they did it has completely gone away! Thanks for the suggestions!

OLE442

Glad it worked for you like it did for me for the same problem! Enjoy!!