Rear end identification
Thread Starter
|
Mountain Pass
Joined: Jun 2013
Posts: 148
Likes: 24
From: San Antonio, TX
Rear end identification
Can someone please help me identify this rear end. It appears to be a GM 10 bolt but any additional information that anyone can glean from these photos would be extremely helpful.
http://i1292.photobucket.com/albums/...zpse1d4734e.jp
http://i1292.photobucket.com/albums/...ps8fae59f1.jpg
http://i1292.photobucket.com/albums/...ps5fdbd1b3.jpg
http://i1292.photobucket.com/albums/...pscb4c5c13.jpg
http://i1292.photobucket.com/albums/...zpse1d4734e.jp
http://i1292.photobucket.com/albums/...ps8fae59f1.jpg
http://i1292.photobucket.com/albums/...ps5fdbd1b3.jpg
http://i1292.photobucket.com/albums/...pscb4c5c13.jpg
Thread Starter
|
Mountain Pass
Joined: Jun 2013
Posts: 148
Likes: 24
From: San Antonio, TX
Rear end
Cargo Master
Joined: Oct 2013
Posts: 2,580
Likes: 29
From: in a barn
Looks like an 8.5 10 bolt, the squared off blocks at the lower corners of the cover give it away.
This is the one I am using in my truck, 70-81 camaro. 8.5 was used in just about everything GM from 1970. Camaros, chevelles, monte carlos, impalas, trucks, vans, etc..
This is the one I am using in my truck, 70-81 camaro. 8.5 was used in just about everything GM from 1970. Camaros, chevelles, monte carlos, impalas, trucks, vans, etc..
Cargo Master
Joined: Oct 2013
Posts: 2,580
Likes: 29
From: in a barn
For an open rear jack up one wheel only, other has to touch the ground and not turn. Turn the wheel in the air two times and count the driveshaft revolutions.
For a posi rear jack up both wheels, turn a wheel one time and count the driveshaft revolutions. With a posi rear both wheels will turn together in the same direction. If they do not then the test will not work.
For a posi rear jack up both wheels, turn a wheel one time and count the driveshaft revolutions. With a posi rear both wheels will turn together in the same direction. If they do not then the test will not work.
Cargo Master
Joined: Sep 2010
Posts: 3,426
Likes: 48
From: Hot AZ (Phoenix Valley)
The codes you've given are for the center section casting, they will not tell the ratio or application.
Look on the front passenger side of the axle tube for a Stamped code - it will give ratio and application.
For the info you've given the code will most likely start with a 'P' or a '2' ...
But to decode what you have:
The date cast code
C 17 1
C = March (Month)
17 = 17th Day
1 = (Year)
1254333 is the cast number. which means it's a 8.5" 10 bolt GM Rear end.
Look on the front passenger side of the axle tube for a Stamped code - it will give ratio and application.
For the info you've given the code will most likely start with a 'P' or a '2' ...
But to decode what you have:
The date cast code
C 17 1
C = March (Month)
17 = 17th Day
1 = (Year)
1254333 is the cast number. which means it's a 8.5" 10 bolt GM Rear end.
Trending Topics
Thread Starter
|
Mountain Pass
Joined: Jun 2013
Posts: 148
Likes: 24
From: San Antonio, TX
C = March (Month)
17 = 17th Day
1 = (Year)
Moe,
the 1 for the year is for waht year, 1971? 81?
17 = 17th Day
1 = (Year)
Moe,
the 1 for the year is for waht year, 1971? 81?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Cargo Master
Joined: Oct 2013
Posts: 2,580
Likes: 29
From: in a barn
Doesnt matter, 71 and 81 used the same internals. Probably an 81 only because the 12 bolt was still around through 1972 and the 10 bolt was just being introduced to replace the 8.2 10 bolt in the early 70s. Didnt become as widely used until 1973.
Cargo Master
Joined: Sep 2010
Posts: 3,426
Likes: 48
From: Hot AZ (Phoenix Valley)
I can not tell with the info given... the 8.5" 10 bolt was started being used in GM cars in 1970 (replacing the 8.2" 10 bolt) and started in vans in '75 trucks started using it in '80 (replacing the 12 bolt). So it can be a '71, '81 or even a '91. you can narrow it down some by the Assembly Stamps I spoke of in my other post.
Thread Starter
|
Mountain Pass
Joined: Jun 2013
Posts: 148
Likes: 24
From: San Antonio, TX
Thinking of getting a 8.8 because I see so many on the board go with that rear end. I found one out of a 02 Ford Exploerer Sport with disc brakes. Does anyone know if this will work for my application (49 Ford F1)
Last edited by dferrell5; Dec 18, 2013 at 10:05 AM. Reason: misspelling
Thread
Thread Starter
Forum
Replies
Last Post
rsylvstr
Clutch, Transmission, Differential, Axle & Transfer Case
3
Apr 22, 2007 09:24 PM