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I have a 99.5 f250 2wd 6 speed how can I tell which rear end I have? I plan on changing gears and maybe a new differential.
 

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10.25- Pre-97 F250 & F350

10.5- All single rear wheel Superdutys

Dana 80- All dual rear wheeled F350s & the older (80-90) Medium duty Superdutys (F450)

Dana 110- All 99+ F450 & F550 Superdutys

There should be a tag on your diff cover that will say 4.10 or 3.73 gears. Chances are it's a 3.73 rearend. Why do you want to regear it?
 

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Dana 110- All 99+ F450 & F550 Superdutys
Incorrect,
Our 99 and 00 F-450s are Dana 80s and our 02 F-550 is the Dana 135. Not sure what model year they switched to the 110s, but I'm guessing 05.

Looking at my 04 owner's manual it lists 80 for the 450 and 135 for the 550 as well.....so I guess the 04 is a Dana 80 too.
 

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Incorrect,
Our 99 and 00 F-450s are Dana 80s and our 02 F-550 is the Dana 135. Not sure what model year they switched to the 110s, but I'm guessing 05.

Looking at my 04 owner's manual it lists 80 for the 450 and 135 for the 550 as well.....so I guess the 04 is a Dana 80 too.
Don't the Dana 110 & 135 look alot alike? I've seen the new 08 F450s & I guess looking at a 2000 F550 I couldn't tell the diffrence. Never got to play or spend much time in the F450-550 Superdutys. I did drive a 93 F450 Bucket truck that had a Dana 80 on the rear. So thanks for correcting me if I'm wrong, that's the only way that we learn!
 
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