Rear disc conversion - 66 Impala - Impala Tech
Brakes & Suspension Conversion Questions & more

 
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post #1 of 11 (permalink) Old 11-01-2014, 11:47 AM Thread Starter
 
 
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Rear disc conversion - 66 Impala

Hello-

Posting a new thread on this as I didn't see anything with my specific application answered within this forum.

I have a 66 Impala I am trying to convert the rear drums to disc's on. Trick is I am told I have a Pontiac 10 bolt rearend - based on the wheel bearing size when I purchased new bearings. The ones for a GM rear end didn't fit so I went back to parts store and they mentioned some of my year had a Pontiac rearend and the bearing fit my car for a Pontiac rear end in their computer for my car.

So I tried a 98 camaro brake plate as I read those would work but it didn't fit over the hub. That plate was 2 3/8ish wide in the center and bolt holes are 3 3 3/8ish wide (center to center). It just barely didn't fit over the axle hub, but very close. Photos of the hub with tape measure lower in the thread.

I also read the 95-97 camaro with a v8 will work but just curious if anyone has any idea on those?


So sum and substance does anyone know if there is a set of brakes I could snag off something at the junkyard and avoid the expensive kits? Considering the 98 brakes where $65 for both sides, less the rotor I think this is a good, cost effective idea.?.?..


Thanks in advance for your input!

Couple pics of the car for fun

Engine
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Last edited by Jdub66; 11-02-2014 at 03:14 PM. Reason: Combining Photos/updated info
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post #2 of 11 (permalink) Old 11-01-2014, 12:09 PM
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A short fat Chinaman named Confucius once said "A picture is worth a thousand words!" It was such a profound statement that people wrote it down, and a lot of the other things that he said as well!

Jacob I copied both of your pictures to my hard drive as your photographic skills are marvelous. I will use your photos to show what a '66 Impala looks like if and when some one asks. I got my second degree in photography (I had taken so many Fine Art classes to keep my GPA up so that I could eventually graduate from Engineering college., that I went ahead and grabed a second baccalaureate degree while I was there).

The 8.5 inch ten bolt out of all GM vehicles is the same. That is why it is called a "Corporate Rear End", because every car after 1972 had one (it was introduced in 1971 in the B-body line of GM cars).

Prior to that date some rear ends where different. That is to say that the 12 bolt used in a Chevy had 30 spline axles and an 8.875' inch diameter ring gear. It was called a 12 bolt because of the number of bolts on the Spicer rear end inspection plate. The same number of bolts where used to attach the ring gear to the differential. In the time frame from 1965 through 1972 while the 12 bolt was being made Olds and Pontiac had a 12 bolt inspection cover rear end that had only ten bolts holding the 8.2 inch ring gear to the differential and used 28 spline axles. It also had pressed on rear axle bearings to retain the axles in place instead of the C-clips used in all other Spicer-Dana rear ends of that era.

Prior to 1965 Chevy made their own rear end that had 10 bolts holding the pumpkin that dropped out in place. That rear end used initially 17 spline axles but with the introduction of the high horsepower 235 six cylinder they upgraded the rear end to the larger 28 spline axles (the higher the spline count the larger in diameter is the axle shaft). Pontiac and Olds having access to a straight (in-line) eight cylinder motor had a larger beefier rear end that used a 9.5 inch diameter ring gear and 35 spline axles (same sized axles and ring gear as used in a Dana 60 rear in in a one ton truck). Bigger is better in rear ends but I don't know which rear end you have. Need pictures to illustrate the problem.

Big Dave

Last edited by Big Dave; 11-01-2014 at 01:39 PM. Reason: added photo coment
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post #3 of 11 (permalink) Old 11-01-2014, 12:16 PM Thread Starter
 
 
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Rear disc conversion - 66 Impala

The rear end in my car is a 10 bolt 8.2

Pics of the pumpkin, drum attached to axle and axle hub below

Axle hub

10 bolt pumpkin
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Last edited by Big Dave; 11-01-2014 at 03:51 PM. Reason: Combining photos
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post #4 of 11 (permalink) Old 11-01-2014, 02:35 PM Thread Starter
 
 
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Here is a shot of the old carrier. I am currently putting a new one in with 3.73's and posi, thus why I want to do my brakes now, I have the axles out.

Also thanks for the compliments on my photography skills, I enjoy taking pictures just don't have a good camera or anything, just use my iPhone, lol
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post #5 of 11 (permalink) Old 11-01-2014, 04:33 PM
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You have an eye for artistic composition. The back ground is important in making the subject interesting, and to make it stand out. Those two photos are exemplary.

Here is a drop out pumpkin Chevy rear end used from 1953 through 1964:



An Olds 10 bolt rear end; note the shape of the cover:



A Chevy 10 bolt rear end once again note the inspection cover:



Here is an Olds 12 bolt cover but ten bolt ring gear"



An Idea of how increasing the spline count increases the size of the axle.



A Chevy Backing plate bolt pattern:



This bolt spacing was used on every Chevy sold regardless of rear end used from 1953 to date.

Here is the bolt pattern on a Pontiac and Olds Axle flange:



Big Dave
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post #6 of 11 (permalink) Old 11-01-2014, 04:57 PM Thread Starter
 
 
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Big Dave can you tell me which brakes plates to use for my axle to go to disc's? The 98-02 camaro didn't work and the f body 93-97 don't look big enough. I also seen that an older model, front wheel drive caddy would work but not sure which models...

Mostly just would like to know if something I could find in the junkyard could be bolted up to my car or if I should just buy a conversion kit from eBay...
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post #7 of 11 (permalink) Old 11-01-2014, 05:05 PM Thread Starter
 
 
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Here is a photo of the front of the pumpkin
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post #8 of 11 (permalink) Old 11-01-2014, 07:22 PM
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I am probably wrong but that looks like a Ford 8.8 inch ring gear out of a Mustang. Maybe Freddie will read this and fill us in as he is a rear end specialist having made his fame and fortune over the past twenty or so years setting up Spicer style rear ends commercially.

Here is why I think some one put a poor man's 12 bolt under your car at some time in the past. They were made from 1977 through to day and there are 22 different vehicles which have different size axles and brake packages as well as widths (most are offset to one side unless it came out of a Mustang in which both 28 spline axles are the same length) making them easy to find and cheaper than any other axle of that strength range. If it is a 8.8 rear then you can probably find rear disc brakes off of an Explorer.

You can find more info on the Ford 8.8 inch rear end in this article. The one you have is from a vehicle before ASB because there isn't a connector at position number 9 on your rear end.

http://www.hotrod.com/how-to/transmi...ord-rear-axle/

Big Dave
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post #9 of 11 (permalink) Old 11-01-2014, 10:00 PM Thread Starter
 
 
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Rear disc conversion - 66 Impala

Very interesting....I wish I knew more about this because I am partially more confused know. Just don't get how the wheel bearings fit and the new carrier...it's the same size as the old one....I'll check the junkyard for explorer's and see what I can come up with but now if that don't work I am confused on what rear end to buy a kit for if I go that route

I just and both axles are the same length and the splines are 28

Last edited by Big Dave; 11-01-2014 at 11:01 PM. Reason: Continuation
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post #10 of 11 (permalink) Old 11-01-2014, 11:06 PM
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Here is a FORD axle Flange Chart. See if the bolt hole measurements match what you have.



Here is a picture of an 8.8 Ford rear end which is why I thought it looked like that rear end.



Big Dave
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post #11 of 11 (permalink) Old 11-02-2014, 03:18 PM Thread Starter
 
 
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Here are some photos with the measurements on what I am seeing. It's close to the 8.8 for sure.

Big Dave do you think any certain year of the explorer would be better? Just curious if one year they are better for some reason or another.
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