1990 ZR1 Batwing rear @5000 miles
 

I have a rear end out of my 90 ZR1 with about 5k on it - $1000

Re: 1990 ZR1 Batwing rear @5000 miles
 

I was interested 2 months ago when you last posted and live just 40 miles from you. I was so interested that I bailed on
buying another unit and you were aware of that. You needed time to determine which gears were installed in your D44,
then you completely stopped replying to my PMs and emails.

It had 4.10s then. What exactly are you selling now?

Re: 1990 ZR1 Batwing rear @5000 miles
 

You are correct that was my mistake and very sorry for the issue- I said I wanted to be sure it was 4:10 . at the same time I got called out of the country - once I dug it out it was indicated on the case as a 3:42

Re: 1990 ZR1 Batwing rear @5000 miles
 

I certainly wouldn't want to rely on the "inked scrawl"!!

There's a "sure fire" way to ID it and that's remove the cover and confirm the information on the ring gear~! You can rotate a short axle with the pinion and short axle indexed and come "comfortably" close for ratio but if it's anything other than a 3.45 you need to remove the cover to confirm brand of the build.

I'd guess that someone used the "rotate to ID" on this one and not being familiar with the Corvette axle ratio's just threw the 3.42 at it because of it's availability most years and models of other GM cars & trucks.

To confirm year of build and it's original build you could just turn it over and all of the "build" information is etched on the case. The build should be either a 605322-9 or 605491-3 for a 3.45.

Re: 1990 ZR1 Batwing rear @5000 miles
 

Thanks for the info - the unit is sold .

Re: 1990 ZR1 Batwing rear @5000 miles
 

No problem - Congrats on the sale.