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Username Post: 57 Chevy 3.36 open rear end swap        (Topic#54279)
mkennedy57 
Senior Member
Posts: 146
mkennedy57
Reg: 01-06-04
01-06-04 04:59 PM - Post#368048    

I have what I think is a 3.36 open gear rear end in my 57 chevy BelAir. The casting number is 3725899 GM 11 and there is also an A27 cast in it.

I think the rear end is going bad because I hear a roaring noise coming from the back.

Does anyone know if it is possible to remove the 3rd member/hogshead and bolt in a posi 3rd member form 57-64?

Thanks in advance for the help,

Mark
Mark Wilkesboro, NC 1957 BelAir 2dr post


 
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67SS427 
Ultra Senior Member
Posts: 12683
67SS427
Loc: Lawrenceville, GA, USA
Reg: 05-26-01
Re: 57 Chevy 3.36 open rear end swap
01-06-04 05:11 PM - Post#368049    
    In response to mkennedy57

yes, it would bolt right in.
The code for the gear ratio is stamped on the opposite side from the cast numbers you gave. They'll be something like AB for example.
Steve F., professional resto work since 1985, http://smg.photobucket.com/albums/v159/67SS427/E xa...




 
mkennedy57 
Senior Member
Posts: 146
mkennedy57
Reg: 01-06-04
Re: 57 Chevy 3.36 open rear end swap
01-06-04 05:30 PM - Post#368050    
    In response to 67SS427

Thanks for the info Steve. I will now try to track down a posi 3rd member. As far as the Letters stamped on the opposite side of the casting numbers, I can't see anything. I tried sanding the paint off and still can't see anything.

Someone told me in 57 GM only offered 3.36 and 3.55 so I am assuming it is a 3.36. I'd rather have posi anyway.

Thanks again for your response!

Mark
Wilkesboro NC
57 BelAir
Mark Wilkesboro, NC 1957 BelAir 2dr post


 
67SS427 
Ultra Senior Member
Posts: 12683
67SS427
Loc: Lawrenceville, GA, USA
Reg: 05-26-01
Re: 57 Chevy 3.36 open rear end swap
01-06-04 06:46 PM - Post#368051    
    In response to mkennedy57

Hi Mark,
The stamping is on the passenger side of the pumpkin in that flat looking area. It's not cast embossed like the other numbers, but stamped in the metal and usually not stamped very deep so they can be hard to see. If your 57 was originally an automatic, it would have a 3.36. Manual would have 3.55, and overdrive a 4.11.
Steve F., professional resto work since 1985, http://smg.photobucket.com/albums/v159/67SS427/E xa...




 
rj_ly 
"6th Year" Gold Supporting Member & Tri-5 Calendar Creator
Posts: 17575
rj_ly
Loc: Southwestern OH
Reg: 11-15-02
Re: 57 Chevy 3.36 open rear end swap
01-06-04 07:00 PM - Post#368052    
    In response to 67SS427

Rear gears from 1955 to 1964 will slide right in the rear housing of your car.

57 Hrdtp(mine for 40 YEARS JULY 12)
57 210 4-dr Sdn(37 yrs Aug 12)
57 Hrdtp(32 yrs Jan 12)
57(windowed)S. Delivery(31 yrs Oct 12)
57 150 Wgn(24 yrs Mar 12)
57 210 2-dr Sdn(8 yrs Oct 12)


 
marks_55 
addict
Posts: 640

Loc: Ohio
Reg: 08-19-02
Re: 57 Chevy 3.36 open rear end swap
01-07-04 09:17 AM - Post#368053    
    In response to rj_ly

You can also buy a posi unit from Randy Ring and Pinion that will bolt right into the stock non-posi rearend

 
Carnut67 
Senior Member
Posts: 556

Loc: Tyler, Texas
Reg: 06-03-03
Re: 57 Chevy 3.36 open rear end swap
01-07-04 10:13 AM - Post#368054    
    In response to rj_ly

I have a posi complete axle and would like to swap it into my non posi 57. I was going to swap the whole axle assembly out, but would it be easier just to swap out the guts? When you say that it bolts right in, do you have to measure any clearances or anything, or what exactly is involved? I certainly would prefer to not have to pull the whole axle out and install another. Keith

 
Thadd 
"12th Year" Gold Supporting Member
Posts: 11121
Thadd
Age: 75
Loc: Rolling Hills, Ca,
Reg: 12-30-01
Re: 57 Chevy 3.36 open rear end swap
01-07-04 11:01 AM - Post#368055    
    In response to Carnut67

Keith..Easy but messy deal.
Jack up rear of car and set up jack stands. Remove rear brake drums and loosen axle retainers...slide axles out a couple of inches (Or take them all of the way out. take them to machine shop and have new wheel bearings installed; it may be the wheel bearings that are making the ugly noise)
Crawl under there and drop the rear U-joint. Run tape around the caps so that they don't hit the ground.
Drain rear end (that is the beginning of the messy part.) Remove the bolts that hold the pumpkin in. Get a strong friend under there with you. Pry on the housing and the pumpkin should pop right out. Clean up the mess that the rear end lube made. Install a new gasket, install the posi pumpkin, tighten the bolts down, install the U-joints and fill the rear with Posi Lube or gear oil and GM posi additive. Push the rear axles back into the splines, bolt down the retainers, put the brake drums on and you are ready to roll..
Remember that the speedo will be off until you put in the proper gear.....
Proud member of the BABY BLUE T-SHIRT BROTHERHOOD


 
Carnut67 
Senior Member
Posts: 556

Loc: Tyler, Texas
Reg: 06-03-03
Re: 57 Chevy 3.36 open rear end swap
01-07-04 01:13 PM - Post#368056    
    In response to Thadd

Thank a million, sounds like what I will do. Gotta be easier than pulling the whole axle out. How much does the pumpkin weigh? I dont have anyone to help around here. Keith

 
Anonymous 

Re: 57 Chevy 3.36 open rear end swap
01-07-04 01:56 PM - Post#368057    
    In response to Carnut67

Keith,
The above is good instructions.
The removeable center section is probably 40lb (a posi center section is a little heavier than a non-posi). I'm 61 yrs old and been doing it (and still do it) for over 35yrs by myself. Although, I admit, LIFTING it back up into the axle housing is becoming more difficult.

I also agree that it is quite possible (and more likely) that the noise you are hearing is the axle bearings and NOT an internal rear end noise.

 
57belairman 
"11th Year" Platinum Supporting Member
Posts: 2954
57belairman
Age: 65
Loc: Missouri City Texas USA
Reg: 03-16-02
Re: 57 Chevy 3.36 open rear end swap
01-07-04 02:18 PM - Post#368058    
    In response to mkennedy57

I would replace the axle bearings, while you have them out anyway. Then you KNOW everything is good. Also make sure everything is clean clean clean. Good luck !!!!
Life is short, Eat dessert first, I always do!!

Picturetrail
57 2dr ht red
57 Convertible black
57 Nomad larkspur blue
57 3100 Pickup
55 2dr Sedan
56 Suburban


 
mkennedy57 
Senior Member
Posts: 146
mkennedy57
Reg: 01-06-04
Re: 57 Chevy 3.36 open rear end swap
01-07-04 02:59 PM - Post#368059    
    In response to 57belairman

Thanks again everyone for all of your posts, you have all proven to be very knowledgeable once again.

I need to get my posi in soon, the ford guys are giving me a hard time about my one wheel burn outs!

Mark
Wilkesboro, NC
57 Chevy BelAir
Mark Wilkesboro, NC 1957 BelAir 2dr post


 
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