Dana 44 front on a 1981?

BearKing

Full Access Member
Joined
Apr 13, 2022
Posts
223
Reaction score
280
Location
Black Hills
First Name
Bear
Truck Year
1976
Truck Model
K10
Engine Size
400
I thought the Corp 10 bolt was issued in about 79? My all original 1981 GMC K2500 has the Dana 44 front and the Corp 14 Bolt rear. The entire truck is original. Only 86,000 miles but the engine needs a rebuild. It has the 292 with the SM465. What say the hive? Thanks guys in adance.
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
7,800
Reaction score
4,432
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
I thought the Corp 10 bolt was issued in about 79? My all original 1981 GMC K2500 has the Dana 44 front and the Corp 14 Bolt rear. The entire truck is original. Only 86,000 miles but the engine needs a rebuild. It has the 292 with the SM465. What say the hive? Thanks guys in adance.
this happened yes

through 78 according to spicer
You must be registered for see images attach

78-80 according to spicer
You must be registered for see images attach

I have a k20 with a d44 front, its a 1980.

79 and 80 are "supposed" to be the end of d44 but people have found exceptions. whats the numbers on the diff point to for build year?
 

Harold Strickland

Full Access Member
Joined
Nov 25, 2020
Posts
56
Reaction score
65
Location
Dunn, NC
First Name
Harold
Truck Year
1979
Truck Model
C20 Crew
Engine Size
350
I have never seen a truck in the 80's with a "factory" Dana 44 but have seen them in '79. I thought that '77 was the end but have certainly seen them used after '77; just not in '81.
 

rpcraft

Full Access Member
Joined
May 31, 2016
Posts
1,288
Reaction score
464
Location
Texas
First Name
Robert
Truck Year
1985
Truck Model
Jimmy
Engine Size
LS 6.0 364 CID
77 - 79 they had stock reserves that they continued to put into trucks. They bolted up the same ans shared the same bolt torque specs for the most part so I don't think they really ever made a big deal on the build sheets so while on the assembly line they just put whatever came down next on the parts carts.
 

dvdswan

Full Access Member
Joined
Mar 11, 2014
Posts
2,126
Reaction score
1,604
Location
Port Orchard, WA
First Name
Dave
Truck Year
1978
Truck Model
K10
Engine Size
350
Nothing is impossible. But chances are that your "all original" is not all original. Even if you bought it brand new, it could have had an issue during pre-delivery inspection and that's what the dealer had on hand. Who knows?
 

rpcraft

Full Access Member
Joined
May 31, 2016
Posts
1,288
Reaction score
464
Location
Texas
First Name
Robert
Truck Year
1985
Truck Model
Jimmy
Engine Size
LS 6.0 364 CID
I'm sure along the way for some reason someone swapped it. Could have been an issue in delivery, maintenance issues, etc etc. I think the bummer for you is you will never know. The only upside is if you ever decide to lift and go with crossover steering you have the proper knuckle to machine so there is a few bucks saved.
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
7,800
Reaction score
4,432
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
1980 k25 and if it mattered, f44 and c6p
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach

4.10 but not 4.10, im pretty sure its 4.09
 

rpcraft

Full Access Member
Joined
May 31, 2016
Posts
1,288
Reaction score
464
Location
Texas
First Name
Robert
Truck Year
1985
Truck Model
Jimmy
Engine Size
LS 6.0 364 CID
1980 k25 and if it mattered, f44 and c6p
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach

4.10 but not 4.10, im pretty sure its 4.09
Numbers are rounded up for whatever reason. Don't ask me why. I guess maybe just to put people at ease. A Dana 44 comes out to like 4.090909, as does the 14 bolt corporate. Becuase there are digits after the 9 they just rounded it up to 4.10. The difference between 4.10 and 4.09 though would be imperceptable on pavement, dirt, or ay other place where you could find to measure the difference. On toyotas and some other trucks its a 4.11, still, such a small difference it would not matter overall.
 

Harold Strickland

Full Access Member
Joined
Nov 25, 2020
Posts
56
Reaction score
65
Location
Dunn, NC
First Name
Harold
Truck Year
1979
Truck Model
C20 Crew
Engine Size
350
That's definitely a Dana44 as evidenced by the housing cover and the steering linkages. The tag on my Dana44HD is stamped 4.09 too. I'd much rather have the 44 instead of the 10 bolt Corporate as well. Well, I really prefer 60's but they are not quite as easy to find & pay for.

Strickland
 

Bextreme04

Full Access Member
Joined
May 13, 2019
Posts
3,091
Reaction score
3,068
Location
Oregon
First Name
Eric
Truck Year
1980
Truck Model
K25
Engine Size
350-4bbl
For what its worth, my 1980 K25 F44 8600GVW truck has the original Corporate 10 bolt in it. If you clean off the top of your axle tube, you should be able to find a stamping on it. That stamping will correspond to a year/application/gear ratio and should match your truck if original. I know there were a few years there where it could be either/or as you can see by Taylors truck and my truck that are basically identical year/option trucks but with different front axles.
 

dvdswan

Full Access Member
Joined
Mar 11, 2014
Posts
2,126
Reaction score
1,604
Location
Port Orchard, WA
First Name
Dave
Truck Year
1978
Truck Model
K10
Engine Size
350
I'm sure along the way for some reason someone swapped it. Could have been an issue in delivery, maintenance issues, etc etc. I think the bummer for you is you will never know. The only upside is if you ever decide to lift and go with crossover steering you have the proper knuckle to machine so there is a few bucks saved.
Good thought, but the flattop knuckle for the passenger side was only up to 76 or 77 vehicles. So they would have to locate a flattop right side knuckle or buy an aftermarket knuckle.

From the pictures, he doesn't have a flattop on the R/S.
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
7,800
Reaction score
4,432
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
Good thought, but the flattop knuckle for the passenger side was only up to 76 or 77 vehicles. So they would have to locate a flattop right side knuckle or buy an aftermarket knuckle.

From the pictures, he doesn't have a flattop on the R/S.
You must be registered for see images attach
You must be registered for see images attach


77 K25 d44
no idea ratio tho

I also have a 78 k10 with d44
You must be registered for see images attach

Also for fun, a rear D60 semi float 5x5.5 4.10 from a 67-72 ish f series
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
7,800
Reaction score
4,432
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
For what its worth, my 1980 K25 F44 8600GVW truck has the original Corporate 10 bolt in it. If you clean off the top of your axle tube, you should be able to find a stamping on it. That stamping will correspond to a year/application/gear ratio and should match your truck if original. I know there were a few years there where it could be either/or as you can see by Taylors truck and my truck that are basically identical year/option trucks but with different front axles.
Did you by chance have C6P too?
and 4.10s? The carrier break at 3.73 seems like it may have decided a lot as that and up would be d44 and below 10 bolt, but that was a vague pdf thing not a spicer themselves thing
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
7,800
Reaction score
4,432
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
That's definitely a Dana44 as evidenced by the housing cover and the steering linkages. The tag on my Dana44HD is stamped 4.09 too. I'd much rather have the 44 instead of the 10 bolt Corporate as well. Well, I really prefer 60's but they are not quite as easy to find & pay for.

Strickland
wHAT makes yours a HD?
 

Latest posts

Forum statistics

Threads
36,195
Posts
764,802
Members
25,352
Latest member
El82Blazer
Top