Rear End Identification
Thread Starter
Le Mans Master
Joined: Nov 2004
Posts: 9,984
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From: Assault is a behavior, not a device! Cypress TX
St. Jude Donor '11
Rear End Identification
I am about to arrange to look at a complete rear end assembly. Since it is about 60 miles away I need some information to know exactly what I'm looking at and I can think of no better source than you guys. The present owner can't tell me anything except it is from a C4 and he thinks it is from an auto transmission. If it is a 3.07 and in good shape I would definitely be interested. My questions to you guys are;
- can you determine the gear ratio by any external stamping or number?
- how do I determine if it is a Dana 36 or 44? I know they look similar but how could I identify the difference by eye?
- are all C4 rear end units interchangeable?
Any help would be appreciated.
- can you determine the gear ratio by any external stamping or number?
- how do I determine if it is a Dana 36 or 44? I know they look similar but how could I identify the difference by eye?
- are all C4 rear end units interchangeable?
Any help would be appreciated.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Look at the case. Somewhere is a raised imprint of what it came with.
The D36 can have 2.59 or 3.07. The D44 can have 3.07 or more.
There are other external differences, but I don't remember all of them.
As far as I know, all rears are interchangable within the car... but I am not 100% sure. Something is bugging me in the back of my mind...
The D36 can have 2.59 or 3.07. The D44 can have 3.07 or more.
There are other external differences, but I don't remember all of them.
As far as I know, all rears are interchangable within the car... but I am not 100% sure. Something is bugging me in the back of my mind...
Burning Brakes
Joined: Feb 2000
Posts: 927
Likes: 0
From: Saginaw TX
As far as ratio, the tooth count of the gears should be scribed into the bottom of the case, my D36 was. Quick test of ratio, especially if it is out of the car is to count the number of turns of the pinion flange it takes to turn the axle one time. about 2 and a half would be 2.59, just over 3 and 3.07, ecetera. I believe the C-beams for the D36 and D44 are different, but that also may be due to D44 only coming with manual tranny from factory. Helms lists following that is electro etched into the bottom of the differential carrier. D36 - GM part# 14093142 (2.59), 14087678 (3.07 w/G92), 14087676 (3.07 w/Z51) D44 is 14087652 (3.07) These are from 1986 manual. Also just noticed, but ratio should be there as well as tooth count. Good Luck
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
Actually there is a plethora of information stamped into the Dana rear ends. Everything from ratio to manufacturing dates, etc. But the most important thing is that the top rear of the D-44 has two bolts in it and the D-36 has but one in the center.
Good luck, GUSTO
Good luck, GUSTO
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Originally Posted by rspreng86
I think that a D44 has three bolts at the top of the diff, and the D36 has two. This is going off my memory though.
Bob
Bob
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
If you go here,
http://www.ikerds.com/catalog/1984-1996.html
...they have very good images of both rear covers, as well as the differentials.
GUSTO
http://www.ikerds.com/catalog/1984-1996.html
...they have very good images of both rear covers, as well as the differentials.
GUSTO
Thread Starter
Le Mans Master
Joined: Nov 2004
Posts: 9,984
Likes: 1
From: Assault is a behavior, not a device! Cypress TX
St. Jude Donor '11
Thanks Guys.
I was able to chase down a 93 factory service manual and found what I needed. According to the diagram in the GM book... the D44 has two cover bolts on top and the D36 has three. All of the information...Dana #, GM # and ratio SHOULD be on the right side of the unit. I just can't tell if it is stamped on on a plate.
For anyone else in the future the 93 P/N's are;
Dana36
GM1-2.59, P/N 10046613
GU2-2.73, P/N 10046614
G44-3.07, P/N 10046615
Dana44
GT7-3.33, P/N 10126418
GM3-3.45, P/N 10126476
As usual you guys got me headed in the right direction!
Thanks again!
I was able to chase down a 93 factory service manual and found what I needed. According to the diagram in the GM book... the D44 has two cover bolts on top and the D36 has three. All of the information...Dana #, GM # and ratio SHOULD be on the right side of the unit. I just can't tell if it is stamped on on a plate.
For anyone else in the future the 93 P/N's are;
Dana36
GM1-2.59, P/N 10046613
GU2-2.73, P/N 10046614
G44-3.07, P/N 10046615
Dana44
GT7-3.33, P/N 10126418
GM3-3.45, P/N 10126476
As usual you guys got me headed in the right direction!
Thanks again!
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Team Owner
Joined: Sep 2003
Posts: 88,393
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From: eville in
Originally Posted by GUSTO14
If you go here,
http://www.ikerds.com/catalog/1984-1996.html
...they have very good images of both rear covers, as well as the differentials.
GUSTO
http://www.ikerds.com/catalog/1984-1996.html
...they have very good images of both rear covers, as well as the differentials.
GUSTO
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Originally Posted by jughead1
Thanks Guys.
I was able to chase down a 93 factory service manual and found what I needed. According to the diagram in the GM book... the D44 has two cover bolts on top and the D36 has three. All of the information...Dana #, GM # and ratio SHOULD be on the right side of the unit. I just can't tell if it is stamped on on a plate.
For anyone else in the future the 93 P/N's are;
Dana36
GM1-2.59, P/N 10046613
GU2-2.73, P/N 10046614
G44-3.07, P/N 10046615
Dana44
GT7-3.33, P/N 10126418
GM3-3.45, P/N 10126476
As usual you guys got me headed in the right direction!
Thanks again!
I was able to chase down a 93 factory service manual and found what I needed. According to the diagram in the GM book... the D44 has two cover bolts on top and the D36 has three. All of the information...Dana #, GM # and ratio SHOULD be on the right side of the unit. I just can't tell if it is stamped on on a plate.
For anyone else in the future the 93 P/N's are;
Dana36
GM1-2.59, P/N 10046613
GU2-2.73, P/N 10046614
G44-3.07, P/N 10046615
Dana44
GT7-3.33, P/N 10126418
GM3-3.45, P/N 10126476
As usual you guys got me headed in the right direction!
Thanks again!
Mike
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Originally Posted by rspreng86
As I said going of memory not correct 100% of the time
I have found some errors in the Helms so I check first hand if I can.
I was at work and could not look at the car, and I archived the gasket that I drew for the differential so that was at home as well.