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Username Post: Will a 1957 Olds 98 rear end fit a 1957?        (Topic#278955)
wesmigletz 
Member
Posts: 65
wesmigletz
Age: 43
Loc: Burbank, CA
Reg: 04-03-04
03-31-12 10:13 PM - Post#2209757    

Is the rear from a 1957 Olds 98 a direct bolt in for a 57? If so, where can you get parts such as gears, Positractions and bearing kits for them?
1970 Blazer
1966 Nova 2 Door Coupe
1965 Malibu Convertible
1962 Corvette
1957 Chevy 150 Sedan

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f.i.57chevynut 
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Posts: 1422
f.i.57chevynut
Loc: Granada Hills, CA
Reg: 03-04-09
03-31-12 10:49 PM - Post#2209766    
    In response to wesmigletz

Yes, bolt-in to a passenger car. 3rd members are on Ebay, kind of pricy. I just finished rebuilding a 3.90 posi that is going onto Ebay for a friend. Street gears, no, race gears, yes. Or used gears, depending on ratio desired. 9.3 ring gear is strong, all bearings are available from Timken, or Koyo if you trust that brand. This Pontiac rearend had one bad Koyo carrier bearing when I tore it down. Glad I didn't try to sell it that way. Come on by and I'll show you how big this stuff is.
Tom Ordway tom@57chevys.com If you don't drive it, why have it?
http://www.americantorque.com/page/0/139/


 
wesmigletz 
Member
Posts: 65
wesmigletz
Age: 43
Loc: Burbank, CA
Reg: 04-03-04
03-31-12 11:26 PM - Post#2209777    
    In response to f.i.57chevynut

Tom, thanks for the info. I'm currently at Ft Lewis, Washington in the Army. I may make it back to Burbank the weekend of Apr 20th.

I saw a craigslist ad for a 1957 Olds 98 that was being parted in Tacoma, and thought it might be worth grabbing, rather than building, and likely breaking the 57's original rear end.

Are the Pontiac rears the same as the Olds? What year rearends would I want to look for?

Here is a shot of what it currently has. I'm planning to keep the homemade traction bars when I either rebuild or replace the rearend.
1970 Blazer
1966 Nova 2 Door Coupe
1965 Malibu Convertible
1962 Corvette
1957 Chevy 150 Sedan

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Edited by wesmigletz on 03-31-12 11:35 PM. Reason for edit: No reason given.

 
56sedandelivery 
Valued Contributor
Posts: 3397

Age: 63
Loc: Everett, Wa.
Reg: 02-26-08
04-01-12 12:19 AM - Post#2209783    
    In response to wesmigletz

The 57 PONTIAC is a DIRECT bolt in, as far as the spring perches go; the 57 Olds has to have the perches moved in some. I have a 57 Olds setup in the garage, all new, with 2 third members, a 4.88 and a 5.37, both on Eaton posi's, and an old pair of Strange axles. As far as parts go, it's gotta be FabCraftMetalWorks.Com in Texas; he also sells on E-Bay. You can get everything from them. Butch/56sedandelivery.

Olds/Pont are virtually the same; there are some minor differences, but you can still swap parts. The 57 will have 29 spline axles, 58 also had 29 spline; they went to 31 spline in 59, and also shortened the axles by 1 inch. You can put a 31 spline third member in a 57-58 rear, just have to shorten the 31 spline axles 1 inch. Axles are also the same length side-to-side, not like the Chevrolet axles at all them being 2 different lengths. There was a 29 spline posi available in 58, but they are very rare now; most guys do the 31 spline update. There's a "sticky" over on JalopyJournal.Com, in the Tech Section that covers these rears. Your traction bars were made locally here by Jim Green Performance and were originally called "Cricket Bars" (Greens trade name); his shop used to be in Lynnwood, now it's in Monroe.



Edited by 56sedandelivery on 04-01-12 12:27 AM. Reason for edit: No reason given.

 
acardon 
Senior Member
Posts: 9871
acardon
Loc: DFW TEXAS
Reg: 03-25-05
04-01-12 07:41 AM - Post#2209836    
    In response to 56sedandelivery

Brad of Fab Craft is my neighbor and just rebuilt my 57 rear end. Link to Fab Craft. He has just published a book about the repair and rebuild of Pontiac/Olds rear ends. He knows his stuff.
Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
wesmigletz 
Member
Posts: 65
wesmigletz
Age: 43
Loc: Burbank, CA
Reg: 04-03-04
04-01-12 08:57 AM - Post#2209859    
    In response to 56sedandelivery

@56SedanDelivery, thank you for the detailed information about the rear ends. The traction bars look a little rough, so I thought they mey have been homemade.
1970 Blazer
1966 Nova 2 Door Coupe
1965 Malibu Convertible
1962 Corvette
1957 Chevy 150 Sedan

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wesmigletz 
Member
Posts: 65
wesmigletz
Age: 43
Loc: Burbank, CA
Reg: 04-03-04
04-01-12 09:01 AM - Post#2209865    
    In response to acardon

@acardon, thanks for the link. I'll be giving him a call.

I had an old Olds/Pontiac rear in a '59 Vette I used to have. It had a set of Ansen traction bars on it. I always liked the nostalgia look of it, and to be honest really miss that car. hat's what kind of got my gears turning when I saw the ad for the Olds 98 being parted.

I'm gonna look into this more. I think the Olds/Pontiac rears may be a viable alternative to the 12 bolt or Ford 8.8" rear I was considering.
1970 Blazer
1966 Nova 2 Door Coupe
1965 Malibu Convertible
1962 Corvette
1957 Chevy 150 Sedan

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www.picturetrail.com/wesmigletz


 
f.i.57chevynut 
Frequent Contributor
Posts: 1422
f.i.57chevynut
Loc: Granada Hills, CA
Reg: 03-04-09
04-01-12 12:36 PM - Post#2209929    
    In response to 56sedandelivery

Looks like Butch has the better info on the Olds verses the Pontiac housing. I have a Pontiac Rearend under my 55 gasser. I wrongly assumed that the Olds was the same because I took a 3/8 fuel fitting from the gas tank of a 57 Olds and the rearend looked the same as my 55. Since you'll be relocating the spring pearches you may consider changing the pinion angle if you're going to be racing rather than cruising.
Tom Ordway tom@57chevys.com If you don't drive it, why have it?
http://www.americantorque.com/page/0/139/


 
wesmigletz 
Member
Posts: 65
wesmigletz
Age: 43
Loc: Burbank, CA
Reg: 04-03-04
04-01-12 01:14 PM - Post#2209941    
    In response to f.i.57chevynut

F.I. ChevyNut, I'm planning to use the car as my daily driver after my next deployment. I will be taking it to the track some, but have to err on the side of street longevity for driveshaft angle, etc.

If I can convince myself not to do a LS swap, I have a 383 that I used to run in the '62. It went 12.64 at Famoso, with a mild Engle HR cam, Edelbrock C4B intake, 3.36 gears and a 2200 stall. It even idled with 16" of vacuum. I figure I should be able to get similar times out of the '57.
1970 Blazer
1966 Nova 2 Door Coupe
1965 Malibu Convertible
1962 Corvette
1957 Chevy 150 Sedan

Pics
www.picturetrail.com/wesmigletz


 
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