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Username Post: MoPar 8 3/4" rear end        (Topic#338721)
4dr 57 
Valued Contributor
Posts: 4624

Loc: Texas Hill Country
Reg: 11-10-04
08-31-16 08:44 AM - Post#2648819    

To be up front I bought a MoPar rear end for my 57 but it is too short by an inch that I was told can not be added on safely.

At 55" (axle) flange to flange i was thinking it would fit a Chevy II. Would it? The spring perches haven't been touched.

I want to sell it because I've already drilled and filled the axles (Moser) bought the desireable green bearings, new backing plates, brakes, drums etc. It also came with a posi and 30 or 31 spline axles, the big u joint, etc. but I don't want to offer it up if it won't fit.
Thanks.

It's all good. mostly




 


raycow 
DECEASED
Posts: 27999
raycow
Loc: San Francisco, CA
Reg: 11-26-02
08-31-16 12:27 PM - Post#2648863    
    In response to 4dr 57

As I recall, a stock 1st gen Chevy II rear is about 57" over the drums, so the rear will be a better fit there than in your 57. I have no clue about the spring spacing. You will just have to find one and measure it.

The Mopar 8-3/4" is a good rear, and with all the work and $ you have put into it so far, it would be a shame to turn it loose. Would you consider a spring relocation on your 57? A lot of rodders do this so they can run wide tires. Wheels with less backspacing will get your tires centered.

To get more info you could try asking on the 55-57 modified forum.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
4dr 57 
Valued Contributor
Posts: 4624

Loc: Texas Hill Country
Reg: 11-10-04
08-31-16 02:31 PM - Post#2648891    
    In response to raycow

Thanks for the measurements Ray
Sounds as though I picked the right car. All it would take to fit the II is narrowing the housing and axles (the axles are not tapered so it would be a straight, shorten the axles period,) and resetting the perches. Much simplier of a fit for this car then a 57. Somebody's going to get lucky as I just want to let it go. Haven't found a place to list it yet. Craigslist? Here?

It's all good. mostly




 
raycow 
DECEASED
Posts: 27999
raycow
Loc: San Francisco, CA
Reg: 11-26-02
08-31-16 08:19 PM - Post#2648949    
    In response to 4dr 57

Why would you want to narrow the Mopar rear? If I am understanding your measurement correctly (55" over the shaft flanges), it is already 2" narrower than a stock Chevy II rear.

I would suggest listing it on both the Chevy II and the 55-57 classifieds. As I said earlier, some tri-five rodders want a narrow rear so they can run wider tires.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
4dr 57 
Valued Contributor
Posts: 4624

Loc: Texas Hill Country
Reg: 11-10-04
09-03-16 04:32 AM - Post#2649241    
    In response to raycow

Thanks Ray, yes I think I understand what you are saying.

The 55" measurement is over the axle flange, not the drums. The short side/right side measurement is approx. 27 or 28" from the axle flange to the center of the housing, if I remember right, making the centering of the pinion in the Chevy II very simple. Easy in fact because one would only have to shorten one side of the housing and one axle.
And as I said before, the axle is not tapered so it is simply a matter of shortening the axle for this application. Oh, and resetting the perches of course.




 
raycow 
DECEASED
Posts: 27999
raycow
Loc: San Francisco, CA
Reg: 11-26-02
09-03-16 05:31 PM - Post#2649309    
    In response to 4dr 57

Ahhh, I was misunderstanding you. Now I believe you are saying the measurement is 55" over the HOUSING flanges. I was confused because a lot of people on here say "axle" when what they really mean is "shaft". If you did mean over the shaft flanges, the difference between that and over the drums would be no more than about 1/4" because the drum webs are only about 1/8" thick at most.

Assuming stock Chevrolet backing plate and drum measurements, I would estimate the overall width at about 62", which is about 2" wider than a stock tri-five rear and about 5" wider than a 1st gen Chevy II rear. This could differ somewhat if you are using Mopar backing plates and drums redrilled with the GM 5 on 4-3/4" bolt pattern.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
4dr 57 
Valued Contributor
Posts: 4624

Loc: Texas Hill Country
Reg: 11-10-04
09-04-16 03:19 PM - Post#2649448    
    In response to raycow

That's probably about right. It makes the off set a problem under a Tri5 because one can't add inches. Atleast that's what Moser told me.

What would happen under a Deuce is the axle would be shifted to the left in order to center the pinion, leaving a couple inches hanging out the right side. This is where is would be shortened. Nice and clean.

I was disappointed when it didn't work this way for the 57 but that's the way it goes. But under a II, man that should be sweet!

I'd like to be absolutely sure. If I knew what the short side measurement on a Chevy II and/or a Nova is, I would be

I'd have to then remeasure the housing, off the backing plate? to make sure but I think it will work out well.

Maybe if somebody besides us reads this Post they will chime in and I can get on with it.



 
Rick_L 
Honored Member
Posts: 27658
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
09-04-16 04:48 PM - Post#2649466    
    In response to 4dr 57

My head is spinning on the discussion of what you're measuring and where.

A 62-67 Chevy II axle is 57"+ across the wheel mounting surfaces.

55" on the housing is too wide for a Chevy II, and 55" on the wheel mounting surfaces is too narrow without moving the springs.

Actually I think the same holds true for a 55-57 Chevy, but the 55-57 is 60.25" wide across the wheel mounting surfaces.



 
4dr 57 
Valued Contributor
Posts: 4624

Loc: Texas Hill Country
Reg: 11-10-04
09-05-16 04:19 AM - Post#2649531    
    In response to Rick_L


There have not been any measurements given except of the axle housing itself. Suggest you reread the post. Regards.

It's all good. mostly




 
Rick_L 
Honored Member
Posts: 27658
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
09-05-16 08:40 AM - Post#2649589    
    In response to 4dr 57

If 55" is the width of the axle housing, it's too wide for a 62-67 Chevy II/Nova.



 
4dr 57 
Valued Contributor
Posts: 4624

Loc: Texas Hill Country
Reg: 11-10-04
09-05-16 11:58 AM - Post#2649621    
    In response to Rick_L

Yes, that's right. I suggest you reread the posts, slower. When you get to the part where I talk about moving the housing to the left in order to center the pinion, then only having to shorten the right side of the housing and the axle, let me know if you think this would work, as I do.
I think it would be an easy way to a great upgrade. I can only wish it would have worked like this under my 57.
The e-brake even looks like it will work w/o any changes too. Thanks



 
jxnslotcar 
Forum Newbie
Posts: 25
jxnslotcar
Age: 61
Loc: Jackson,Michigan 49202
Reg: 04-17-11
11-14-16 10:52 AM - Post#2661532    
    In response to 4dr 57

I never saw what you would take for the rear diff? For what I am putting together I would need to narrow both sides.

1965 Mailbu 2dr post (old drag car)
1964 Chevelle SS-looking for a frame
1958 Chevy Biscayne 4dr hardtop (4 sale),72 MGB (4 sale)
1963 Chevy II 2dr hardtop (on the rotisserie)
65 Olds Jetstar Convertible (4 sale),63 Pont Grand Prix 2dr (4sale)


 
56sedandelivery 
Dedicated Member
Posts: 5689
56sedandelivery
Age: 68
Loc: Everett, Wa.
Reg: 02-26-08
04-03-17 10:59 AM - Post#2684777    
    In response to jxnslotcar

There must be a demand for it with the MOPAR guys. Those are the guys I'd be targeting. I have a friend that deals in Tri-Five Chevrolet cars AND parts. Years ago, he had a 56 Bel Air 2 door sedan, with a 454/TH400 out of a truck, and a "Pontiac" rear end. I looked under it one day, and thought that's a 56 and older Pontiac rear end, until I saw the pinion snubber bosses on the front of the third member. MOPAR! He had no idea what the rear end originally came under; it was in the car when he bought it. He eventually sold the car, the rust bucket it was. The 8 3/4" MOPAR rear ends are pretty strong. After the 57-64 Olds/Pont rears fell out of favor with the Fuel Funny's and Dragsters, they all started to use the 8 3/4" MOPAR or Ford 9"; that was before the aftermarket, modular rear ends came out. I'd target the MOPAR guys. I am Butch/56sedandelivery.




 


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