Dana 80 rear diff ratio change
Thread Starter
|
New User
Joined: Nov 2013
Posts: 2
Likes: 0
Dana 80 rear diff ratio change
I have a 2002 F450 2WD AT with the common Dana 80 4.88:1 posi rear diff. If I change the ring & pinion to 4:10 do I need to change the carrier or does my current carrier fit 4:10 & lower [4.63,4.88, 5.13 etc]? Will I need to adjust my speedo readings & if so how is this accomplished? Electronically via the diagnostic port?
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
I am not aware of a company that manufactures a 4.10 gear set for the F-450 D80 carrier. I think the tallest you can go is 4.30. My 450 has the 4.30 gear set and its a good ratio for my use. 
Recalibrating the speedometer is only necessary when changing the tire size...gear ratio changes have no effect. Recalibration is normally accomplished via the diagnostic port.
Recalibrating the speedometer is only necessary when changing the tire size...gear ratio changes have no effect. Recalibration is normally accomplished via the diagnostic port.
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
Yukon makes gear sets from 3.31 to 5.38 for the DANA 80 differential. They come in thick and thin sets, depending on your carrier.
Call Randy's Ring and Pinion at 1-866-631-0196. Tell then what you have, they will tell you what you need.
Randy's Ring & Pinion
Call Randy's Ring and Pinion at 1-866-631-0196. Tell then what you have, they will tell you what you need.
Randy's Ring & Pinion
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
Yukon makes gear sets from 3.31 to 5.38 for the DANA 80 differential. They come in thick and thin sets, depending on your carrier.
Call Randy's Ring and Pinion at 1-866-631-0196. Tell then what you have, they will tell you what you need.
Randy's Ring & Pinion
Call Randy's Ring and Pinion at 1-866-631-0196. Tell then what you have, they will tell you what you need.
Randy's Ring & Pinion
Thread Starter
|
New User
Joined: Nov 2013
Posts: 2
Likes: 0
TY for the help. Any additional opinions re the speedo accuracy after rear diff ratio change as I believe the speedo will be slow as the driveline is turning less revolutions per mile with a 4:10 as compared to a 4:88:1?
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
The Vehicle Speed Sensor does not measure drive line speed....it measures how many times the ring gear rotates. It doesn't matter what gear you install, the ring gear will still rotate the same amount of times for a given road speed provided the tire size is the same.
Thread
Thread Starter
Forum
Replies
Last Post
Richard51
1948 - 1956 F1, F100 & Larger F-Series Trucks
9
Apr 17, 2013 09:01 AM
wook540
Clutch, Transmission, Differential, Axle & Transfer Case
4
Jul 20, 2004 09:34 PM
