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Username Post: '60 Impala Rearend Upgrade Help        (Topic#350598)
60Impala1837 
"3rd Year" Silver Supporting Member
Posts: 119
60Impala1837
Loc: Phoenix
Reg: 07-06-13
04-12-18 02:22 PM - Post#2730806    

Has anyone ever replaced a their stock '60 3.08 rear end with a '64-'67 Chevelle 12 bolt posi?

I saw a reference online that the following models all had a 60" rearend width:
55-64 Chevy Car, 67-69 Camaro, 64-67 Chevelle, 68-74 Nova, 71-73 Mustang/Cougar, 84-95 Corvette

I have an option on a great deal on a rebuilt '64-'67 Chevelle rear end (12bolt posi, 3.55 with disc brakes) but I don't know if it fits or makes sense to try to replace all the brackets to make it work.

Any help appreciated.


Attachment: 12bolt-posi.jpg (74.13 KB) 3 View(s)




Jim
'60 Impala Sport Coupe, 283/pg
Former:
'65 BelAir (355 / 350 hp)
'68 Caprice (donor)
My Pictures


 
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Gene_Schneider 
Ultra Senior Member
Posts: 12121

Loc: Wisconsin..USA
Reg: 09-27-02
04-14-18 07:26 PM - Post#2730998    
    In response to 60Impala1837

64-67 Chevells had a 10 bolt rear end except for the SS396

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
DZAUTO 
Senior Member
Posts: 8480

Loc: Mustang, OK, USA
Reg: 12-25-99
04-15-18 06:23 AM - Post#2731019    
    In response to 60Impala1837

The 59-64 pass car rears and 64-72 Chevelle rears have a TOTALLY different mounting setup. As you mentioned, you would have to completely change ALL the brackets on the Chevelle rear. It would be somewhat time consuming to cut off brackets from a 59-64 axle housing, cut off the brackets from the Chevelle housing and then CORRECTLY position and weld the 59-64 brackets onto the Chevelle housing.
BUUUUUUUUUUUUUT, with that said, a 12 posi Chevelle rear would certainly be somewhat stronger than the 60 rear. If you went through all that effort, you would certainly end up with a good rear.

Several years ago, I sorta kinda went through this process. I had a 12bolt 71 Chevelle rear that had mangled brackets which (in my book) were not repairable. I had another JUNK rear that had good brackets. So I cut off the brackets from both rears and had the good brackets welded onto the good 12bolt rear which is now under my 70 Chevelle conv. Yes, it was quite time consuming, but I now have a nice, strong 12bolt posi under the Chevelle.



Attachment: DSCN1275.JPG (4.31 MB) 1 View(s)




Attachment: DSCN1276.JPG (4.38 MB) 2 View(s)




Attachment: 12bolt_close.JPG (892.2 KB) 1 View(s)






 
Hugomiller 
Silver Supporting Member
Posts: 112
Hugomiller
Age: 67
Loc: Florida and UK
Reg: 05-02-17
04-16-18 02:00 PM - Post#2731186    
    In response to DZAUTO

If you do swap it over, I might be in the market for a 3.08 to fit my 1960 Impala convertible. The 3.36 currently in there is too low for my liking.



 
60Impala1837 
"3rd Year" Silver Supporting Member
Posts: 119
60Impala1837
Loc: Phoenix
Reg: 07-06-13
04-16-18 10:21 PM - Post#2731242    
    In response to 60Impala1837

Thanks for the help.
After looking at what I would have to do the 12bolt to make it work for my project, the good deal did not seem so good. I may as well just go buy a complete Ford 9" posi premade with the correct brackets for the Impala.

For anyone else curious, I found quickperformance.com had the best price and currieenterprises.com sells new brackets available.


Jim
'60 Impala Sport Coupe, 283/pg
Former:
'65 BelAir (355 / 350 hp)
'68 Caprice (donor)
My Pictures


 
1belair1954 
Poster
Posts: 38

Reg: 12-24-12
04-17-18 03:09 AM - Post#2731252    
    In response to 60Impala1837

Hi you can upgrade your original rear end with an Eaton posi and stronger axles http://www.quickperformance.com/GM-55-64-Car-55P_c...
Does anybody know how strong this setup is ?
I am running a stock rear end with 6 cylinder ratio I have a fairly stock 327 but will be upgrading the power a little more. How strong is the stock rear end ? I remember my brother a while ago had a 1959 Pontiac the spider gears would always break it was an export model so probably had the same rear end as a 59-60 chevy I think



 
1belair1954 
Poster
Posts: 38

Reg: 12-24-12
04-17-18 03:09 AM - Post#2731254    
    In response to 60Impala1837

Hi you can upgrade your original rear end with an Eaton posi and stronger axles http://www.quickperformance.com/GM-55-64-Car-55P_c...
Does anybody know how strong this setup is ?
I am running a stock rear end with 6 cylinder ratio I have a fairly stock 327 but will be upgrading the power a little more. How strong is the stock rear end ? I remember my brother a while ago had a 1959 Pontiac the spider gears would always break it was an export model so probably had the same rear end as a 59-60 chevy I think



 
1belair1954 
Poster
Posts: 38

Reg: 12-24-12
04-17-18 03:09 AM - Post#2731253    
    In response to 60Impala1837

Hi you can upgrade your original rear end with an Eaton posi and stronger axles http://www.quickperformance.com/GM-55-64-Car-55P_c...
Does anybody know how strong this setup is ?
I am running a stock rear end with 6 cylinder ratio I have a fairly stock 327 but will be upgrading the power a little more. How strong is the stock rear end ? I remember my brother a while ago had a 1959 Pontiac the spider gears would always break it was an export model so probably had the same rear end as a 59-60 chevy I think



 
55 Shaker 
Member
Posts: 1425

Age: 68
Loc: north central IL.
Reg: 03-13-06
04-17-18 07:59 AM - Post#2731278    
    In response to 60Impala1837

Moser Engineering is another good place to get a rear end. http://www.moserengineering.com/

The older I get, the more dangerous, I am !!!!


 
raycow 
Honored Member
Posts: 27372
raycow
Loc: San Francisco, CA
Reg: 11-26-02
04-17-18 12:08 PM - Post#2731305    
    In response to 60Impala1837

If your 12 bolt rear came out of a Chevelle, it has already had some modifications. Compare your pic with those from DZAUTO and you will see it is missing the two cast lugs needed for the stock A-body upper control arms. The other brackets remaining on your housing also look different from his.

Ray

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


 
raycow 
Honored Member
Posts: 27372
raycow
Loc: San Francisco, CA
Reg: 11-26-02
04-17-18 12:28 PM - Post#2731310    
    In response to 1belair1954

  • 1belair1954 Said:
....Does anybody know how strong this setup is ?
I am running a stock rear end with 6 cylinder ratio I have a fairly stock 327 but will be upgrading the power a little more. How strong is the stock rear end ? I remember my brother a while ago had a 1959 Pontiac the spider gears would always break it was an export model so probably had the same rear end as a 59-60 chevy I think


The stock rear end should be more than adequate for a 327 with "reasonable" tires. Don't forget that GM considered this design to be strong enough for a 409. The only caveat was that you had to use the tires which came with the 409. If you were racing in stock class back in the day, that would have limited you to about a 6" tread.

The spider gear issue you mentioned was mainly a problem only with open rears. It pretty much goes away if you have a posi in good working condition.

Ray

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


 
stanski 
Poster
Posts: 55

Reg: 05-05-16
05-16-18 08:29 AM - Post#2734101    
    In response to 60Impala1837

If your ultimate goal is posi and a strong gear, I would get a new pumpkin and axles. Several reliable gear vendors who supply what you need for the front loader X-frame rear housings. A lot less work than trying to modify a square peg then start hammering into a round hole. Let modern technology be your friend.



 
DZAUTO 
Senior Member
Posts: 8480

Loc: Mustang, OK, USA
Reg: 12-25-99
05-16-18 06:36 PM - Post#2734140    
    In response to stanski

Let me mention this again (probably mentioned it a thousand times over the years).
For those not familiar with these stock rearends, REMEMBER, they were installed behind 350hp/348 4sp and 63-64 425hp/409 4sp combos.
OK, how well did they hold up? Good question. Unless they were REGULARLY abused with sticky slicks, they did quite well. SOOOOOOOOOOOOOOOO, bottom line, if the car is to be a street/performance/driver , and if the rear is properly rebuilt (adding a posi is a must) and set up, it will probably provide many years of trouble free service. BUUUUUUUUUUUUUUUT, if the plan included beating and banging on it with a 500+hp engine, then it may be best to go with a 12bolt or a 9incher.
Of course I do build my own rears (and 4spds and engines), and 3 of my cars have this style rearend-----------------a nd they are still kicking.



 
beagrizzly 
"9th Year" Gold Supporting Member
Posts: 1808
beagrizzly
Age: 67
Loc: south texas
Reg: 08-04-12
05-18-18 08:16 PM - Post#2734306    
    In response to DZAUTO

Yeah, but DZ, we all know that you baby your cars!!!

lol.

Griff

if you're gonna be a bear..................

1960 Biscayne (the 6T)
2005 Yukon XL
2007 GMC Sierra Classic 8.1
2009 Silverado
2011 Escalade ESV


 
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