IS THIS A JL8?
 

Im hoping someone can help me ID this 12 bolt. It has a tapered tube housing. The only book I have is to decode the ratio on the tube, the only problem is that it has no numbers. I cant tell if the housing was sanded one time to paint it. The lower # on the first pic reads 67890. The axle flange has a XC on it . Any help would be greatly appreciated.I will try to post a few pix to help with the ID.Thanx in advance, Bob

Re: IS THIS A JL8?
 

another pic

Re: IS THIS A JL8?
 

pic3

Re: IS THIS A JL8?
 

pic4

Re: IS THIS A JL8?
 

pic5

Re: IS THIS A JL8?
 

From picture 2, it looks like the end of the axle tube has the taper to it which would be the JL8. It has the correct JL8 parking brake bracket welded on as well, but that could have been added. My car is at the shop so I can't compare the rest of the pictures. Did you try cleaning off the paint to see if the rear code was filled in? That seems very odd that someone would have gone through the trouble to fill it in or sand off the code. Even the HD service package rears had codes on them. But picture 1 looks like the date is D 25 2 which would decode as 1972 and they only made them in 69. I'll look around for more information, but it looks like someone converted a 72 rear to discs with JL8 parts. Look around for as many casting numbers and stampings as you can find.

Re: IS THIS A JL8?
 

The axels are correct J-L8, the taper to the rear of the flange is to clear the parking brake shoes. The hub is also diffrent to mate up to the rotor and the studs are longer to go trough the extra material on the rotors. Also the welds look factory on the parking brake cable brackets.
Rich

Re: IS THIS A JL8?
 

Is the D252 the casting date or a control code? It sure looks like a real JL8 rear but that date code doesn't make sense.

Re: IS THIS A JL8?
 

I agree with Jeff H. It looks like a converted '72 rear. The axles look correct- mine has 7206 and WY on the flange. It also looks to have a left and a right side caliper bracket (5977 & 5776). The JL8 used two right brackets (5977).

Re: IS THIS A JL8?
 

Looking at pic #1, you can see the main cap has a TAB that comes out from the side. GM started doing this around 1972 as to add strangth to the rear.I feel that the rear could be a counter replacement."MOF" http://host.threadshosting.com/~yenk...ns/scholar.gif

Re: IS THIS A JL8?
 

A picture of the whole diffential

Re: IS THIS A JL8?
 

after cleaning,painting and re installing the differential into the car I decided to up grade the rear disc brakes to aftermarket cross-drilled and slotted rotors. I ordered all the parts and started mounting . I come to find out the new brackets dont bolt up to the flange, and if they did they would hit the e-brake bracket. I researched this site and find out that the flange at the end of the tubes are heavy duty truck items. I really think that someone doing a concourse restoration on a Camaro with JL8 would be able to use this rear end . I would hate to "undo" the brackets and flange to a regular 12 bolt configuration to make my bracketry fit. Im posting more pics of the rear end and components . If anyone is interested in in this rear end please feel free to stop by and or send someone from this site to check it out.You can call me anytime at 630-707-1009 if you have any questions.I would like to sell it here before posting it on that auction site. Im restoring my Fathom Green 69 SS/RS and would like to use the extra $$$$ from the sale of this differentioal to help offset the cost of restoring this car. $4000.00

Re: IS THIS A JL8?
 

Beveled axle flange . 206 WY

Re: IS THIS A JL8?
 

Caliper brackets 5576, 5577

Re: IS THIS A JL8?
 

I'm restoring a JL8 rear end- D-11-9.I have approximately 5 yrs into this thing.I had no idea what it was when I bought it 'till I really looked at it.It's a QW rear.I've had to replace almost everything on it.The only thing I'm having trouble with are the axles.They were gone when I got the diff as were the e brake cable brackets.When they took the backing plates off they used a torch and wrecked the rear flanges-DUH!!So it has been an up hill battle thus far.I found this in a '55 Chevy Bel Air that was totalled that had the matching L78/M22 drivetrain in the car.The only thing the owner would seperate with was the rear end.Had no idea what it was.I do plan on parting with it as the car I was going to put it in-I sold.This does belong in an April/69 car.I put the identical brake set up 4 piston caliper(front and rear) in my '66 Pontiac 2 dr post and WOW,what stopping power!!!! Will post pic's soon.