Identity crisis?
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Elder User
Joined: Sep 2010
Posts: 667
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From: Small acerage in Nebraska
Identity crisis?
A quick question for the truck crowd. How do you identify the 10.25 axle when the tag is gone? Is there a number on it somewhere? I've read that the D60 has identifying numbers stamped on the tubes.
I'm sure I have a 10.25, reputed to have 4.11 gears but have yet to verify. Also wondering how much difference is there between the D50 TTB and the D44 TTB axles? Getting ready to upgrade my '91 Bronco with some '92 F250 donor parts. I have the entire truck minus a few parts, like the box, engine, and most of the interior.
I'm sure I have a 10.25, reputed to have 4.11 gears but have yet to verify. Also wondering how much difference is there between the D50 TTB and the D44 TTB axles? Getting ready to upgrade my '91 Bronco with some '92 F250 donor parts. I have the entire truck minus a few parts, like the box, engine, and most of the interior.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
4.10's are common in the 10.25 axle.
Turn the wheel or hub and count pinion rotations.
It should be simple to see if it is slightly more than 4:1
There were also 3.73, 3.55 and in some heavier trucks 4.56.
I am no expert but it is my understanding that the D50 and 44HD only differ from the knuckles out.
Turn the wheel or hub and count pinion rotations.
It should be simple to see if it is slightly more than 4:1
There were also 3.73, 3.55 and in some heavier trucks 4.56.
I am no expert but it is my understanding that the D50 and 44HD only differ from the knuckles out.
i ain't rite
Joined: Mar 2005
Posts: 65,585
Likes: 5,614
From: Marlboro Mental Hospital.
post up the numbers on the "B" pillar tag and we can decode them for you.
the D-50 and D-44 are completely different animals, the only thing the same is they are IFS.
D-44 has a small locking hub, and does not completely cover the mounting flange. D-50 has a larger hub and it covers the flange
D-44:
D-50:
the D-50 and D-44 are completely different animals, the only thing the same is they are IFS.
D-44 has a small locking hub, and does not completely cover the mounting flange. D-50 has a larger hub and it covers the flange
D-44:
D-50:
Fleet Mechanic
Joined: May 2013
Posts: 1,256
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From: NC
the 10.25 ff has hubs that stick out further than a dana 70, factory gears were 3.55 and 4.10, I think the 3.73's were only in later SD trucks with the updated 10.5 or are aftermarket, I could be wrong though.
Posting Guru
Joined: Aug 2004
Posts: 2,417
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From: Braham MN
If its in an 85-97 F250 or F350 its a Sterling 10.25 with either 3:55's or 4:10's.
After 99.5 the F250/350 was equipped with the Sterling 10.5 rear Axle.
Odds are if your looking at front axles on a 3/4 ton you will find the D50.
The D44 was in the half tons and VERY FEW 3/4 tons.
Diesel Rod
After 99.5 the F250/350 was equipped with the Sterling 10.5 rear Axle.
Odds are if your looking at front axles on a 3/4 ton you will find the D50.
The D44 was in the half tons and VERY FEW 3/4 tons.
Diesel Rod
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Elder User
Joined: Sep 2010
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From: Small acerage in Nebraska
I haven't gotten under the front to see if the tag is still on front diff, it should say whether it's D44HD or D50 right?
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pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
Just look at the hubs.
Tom pictured them.
The D50 will be cylindrical, the 44 will taper to a much smaller lockout.
Tom pictured them.
The D50 will be cylindrical, the 44 will taper to a much smaller lockout.
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Fleet Mechanic
Joined: May 2013
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From: NC
Actually the Dana 44hd came standard in all f250 4x4 regular cabs until around 90 or 91, then the only option was the Dana 50. All extended cabs 4x4s came with the 50 standard . Not really a certain reason for why a truck received what axle, mines a 8600 gvwr, Full float10.25 rear, diesel and has a dana 44hd up front. Ive seen a gas 87-88 light-duty f250 regular cab semi float rear truck with a dana 50 up front.
Posting Guru
Joined: Aug 2004
Posts: 2,417
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From: Braham MN
Like I said before the odds of finding a D44 front are pretty slim..... only in 85-90 reg cabs.....
Diesel Rod
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