Changing axle ratio
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Junior User
Joined: Apr 2003
Posts: 59
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From: Burnaby BC
Changing axle ratio
Im not sure if this has been discussed yet ,but im having a hard time getting the info from dealers on the axle ratio of a truck.They mostly say they dont know it.What i want to know from here is what do i look for on the tag so to conferm the axle ratio OR if i find the "perfect"truck can i change the axle to a 4:10 and not have to worry about the computer getting put in a spin?Im looking for a F350 c/c 4x4 deisel from the yrs.2000------2003 with the 7.3 auto.Ive found quite a few but not knowing if i can swap gear sets has put me off...Thanks a bunch for the info...................Paul Im wanting this for towing a cargo trailer with a camper
Posting Guru
Joined: Jan 2003
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From: Back in the TX Coast
below is the list of axle codes...these are found on the drivers door jamb sticker
Axle Type
31 — 3.73 non-limited slip, F-250/Excursion
C1 — 3.73 limited slip, F-250/Excursion
32 — 4.10 non-limited slip, F-250
C2 — 4.10 limited slip, F-250/Excursion
33 — 4.30 non-limited slip, F-250
C3 — 4.30 limited slip, F-250/Excursion
36 — 4.56 non-limited slip, F-250
C6 — 4.56 limited slip, F-250
41 — 3.73 non-limited slip, F-350 (single rear wheels)
D1 — 3.73 limited slip, F-350 (single rear wheels)
42 — 4.10 non-limited slip, F-350 (single rear wheels)
D2 — 4.10 limited slip, F-350 (single rear wheels)
43 — 4.30 non-limited slip, F-350 (single rear wheels)
D3 — 4.30 limited slip, F-350 (single rear wheels)
46 — 4.56 non-limited slip, F-350 (single rear wheels)
D6 — 4.56 limited slip, F-350 (single rear wheels)
61 — 3.73 non-limited slip, F-350 (dual rear wheels)
F1 — 3.73 limited slip, F-350 (dual rear wheels)
62 — 4.10 non-limited slip, F-350 (dual rear wheels)
F2 — 4.10 limited slip, F-350 (dual rear wheels)
63 — 4.30 non-limited slip, F-350 (dual rear wheels)
66 — 4.56 non-limited slip, F-350 (dual rear wheels)
F6 — 4.56 limited slip, F-350 (dual rear wheels)
Axle Type
31 — 3.73 non-limited slip, F-250/Excursion
C1 — 3.73 limited slip, F-250/Excursion
32 — 4.10 non-limited slip, F-250
C2 — 4.10 limited slip, F-250/Excursion
33 — 4.30 non-limited slip, F-250
C3 — 4.30 limited slip, F-250/Excursion
36 — 4.56 non-limited slip, F-250
C6 — 4.56 limited slip, F-250
41 — 3.73 non-limited slip, F-350 (single rear wheels)
D1 — 3.73 limited slip, F-350 (single rear wheels)
42 — 4.10 non-limited slip, F-350 (single rear wheels)
D2 — 4.10 limited slip, F-350 (single rear wheels)
43 — 4.30 non-limited slip, F-350 (single rear wheels)
D3 — 4.30 limited slip, F-350 (single rear wheels)
46 — 4.56 non-limited slip, F-350 (single rear wheels)
D6 — 4.56 limited slip, F-350 (single rear wheels)
61 — 3.73 non-limited slip, F-350 (dual rear wheels)
F1 — 3.73 limited slip, F-350 (dual rear wheels)
62 — 4.10 non-limited slip, F-350 (dual rear wheels)
F2 — 4.10 limited slip, F-350 (dual rear wheels)
63 — 4.30 non-limited slip, F-350 (dual rear wheels)
66 — 4.56 non-limited slip, F-350 (dual rear wheels)
F6 — 4.56 limited slip, F-350 (dual rear wheels)
Senior User
Joined: Oct 2005
Posts: 259
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From: SPARKS NEVADA
I know my SD tows great, but the mnts kill me.....I just looked in the door jam and saw C1 .....thanks autobahn. I kinda knew it was the 3.73, but couldn't remember. with the V10 the trucks got the gutts but long uphill grades over the Sierras kill me. I'm going to switch to the 4.1 or .3 to get more torq out of this gas eating beast. thanks to V10man I have an est for the cost...
Laughing Gas
Joined: May 2003
Posts: 1,148
Likes: 1
From: Richmond, VA
FMC,
It is doable but you really better want to. It is quite expensive especially for the 4X4's. Search and you will find threads on the subject.
Reg
01 F350 CC dually 7.3L 4.10 rear 6637 intake filter.
It is doable but you really better want to. It is quite expensive especially for the 4X4's. Search and you will find threads on the subject.
Reg
01 F350 CC dually 7.3L 4.10 rear 6637 intake filter.
New User
Joined: Jul 2006
Posts: 2
Likes: 0
I just purchased a 1994 Ford F350 with a 7.3 TD and a 5 speed. Stock tires and turns 2,000 at 55 mph. I looked at the tags on the Diff but can't find anything to decifer the codes. There's 2 lines, first one is "SS132G" and the second is "L101024E09". Can anyone tell me what axle this is and what the gear ratio is and if it is limited slip or not?
Thanks in advance
SoCalChris
Thanks in advance
SoCalChris
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
Originally Posted by FMC
What i want to know from here is what do i look for on the tag so to conferm the axle ratio OR if i find the "perfect"truck can i change the axle to a 4:10 and not have to worry about the computer getting put in a spin?Im looking for a F350 c/c 4x4 deisel from the yrs.2000------2003 with the 7.3 auto.Ive found quite a few but not knowing if i can swap gear sets has put me off...Thanks a bunch for the info...................Paul Im wanting this for towing a cargo trailer with a camper
Also regarding the computer question. No issue...as the computer only knows what the sensor tells it...and does not account for gear ratio.
biz
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2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s
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Elder User
Joined: Jun 2001
Posts: 775
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From: Northern Va
Originally Posted by biz4two
As other folks have mentioned, You can swap gears without any issues. All the SRW SD's have the 10.50" rear.
Also regarding the computer question. No issue...as the computer only knows what the sensor tells it...and does not account for gear ratio.
Also regarding the computer question. No issue...as the computer only knows what the sensor tells it...and does not account for gear ratio.
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Posting Guru
Joined: Jul 2006
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From: New York
Can someone explain what is involved in swapping out the gears? do they have to swap the axles themselves or do they open up the differentials and swap out the gears inside? I am interested in going for the 4.10's.
Lead Driver
Joined: Sep 2003
Posts: 5,844
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From: Albuquerque
Originally Posted by PHWLEE
Can someone explain what is involved in swapping out the gears? do they have to swap the axles themselves or do they open up the differentials and swap out the gears inside? I am interested in going for the 4.10's.
biz
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2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s
Last edited by biz4two; Jul 31, 2006 at 09:27 PM.
Lead Driver
Joined: Sep 2003
Posts: 5,844
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From: Albuquerque
Originally Posted by ReAX
Off topic question, do 4.30 gears exist for the F250 SRW? I have searched Ford, Motive, National driveline, Precision gear, and superior axle to no avail.
biz
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2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s
Lead Driver
Joined: Sep 2003
Posts: 5,844
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From: Albuquerque
Originally Posted by CmprSpecial
Actually the computer does know. It uses that information to do shift timing and such. True, the speedo won't know the diff (pun intended) but you still need to change the value in the ECU when you regear...
For Gas engines: The instrument cluster provides power to the speed control indicator. On gasoline vehicles, the speed control indicator is controlled by the speed control module. When the speed control is engaged, the speed control module provides the instrument cluster with a ground signal and illuminates the speed control indicator.
For Diesel Engines: On diesel vehicles, the speed control indicator is controlled by the PCM. When the speed control is engaged, the PCM provides a ground to the instrument cluster and illuminates the speed control indicator.
biz
_____________________________
2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s