Axle codes info conflict
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Senior User
Joined: Jul 2003
Posts: 311
Likes: 2
From: Nashville
Axle codes info conflict
I have two different sets of axle ratio codes, and unfortunately they don't always match up:
Code "19", one chart says 3.55 ratio, the other 4.11 [big difference]
Code "23" appears as both 3.31 and 3.54
Code "16" as both 3.50 and 3.73
Anyone know which #'s are right...or both? Did the codes change over the years, by vehicle, or with the axle type [9", 8.8", Dana 6x]? I'd just spin the rear ends I'm looking at to verify each one, but that's very impractical the way they're situated.
any help would be greatly appreciated.
Code "19", one chart says 3.55 ratio, the other 4.11 [big difference]
Code "23" appears as both 3.31 and 3.54
Code "16" as both 3.50 and 3.73
Anyone know which #'s are right...or both? Did the codes change over the years, by vehicle, or with the axle type [9", 8.8", Dana 6x]? I'd just spin the rear ends I'm looking at to verify each one, but that's very impractical the way they're situated.
any help would be greatly appreciated.
Elder User
Joined: Nov 1999
Posts: 796
Likes: 3
From: Anderson Northern Ca
Axle Code
83 Van,My 77 F-150 4x4 SB has an axle code that reads 16J.There are no tags on the diffs so I do not know what the ratios are either.Is there somewhere else to find the ratio info? Thanks for any help.
"bowties in the rearview mirror"
"bowties in the rearview mirror"
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Senior User
Joined: Jul 2003
Posts: 311
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From: Nashville
This is an '83 E100 van with the 300 straight six, C6 tranny. It has a 3.00 gear right now [code 14, ford 9"] which is great for the highway but makes me slow to 30mph going uphill while towing. Looking to drop the ratio to the 3.50 -ish range for the least $$ possible. My local pick-ur-part salvage yard has several potential donor vehicles but many have bent drive shafts from being move around with a forklift, which prevents an easy "spin the wheels" ratio check.
Would prefer to just do a pumpkin swap, but the Ford 9" rears have been picked over quite a bit. Several of the late model ['88-'91] vans have a code 19 Ford 8.8" rear end, but I've seen "code 19" listed as both 3.55 and 4.11, and none are spin-checkable w/o dropping the driveshafts. 3.55 should be just right, but I fear a 4.11 would be too low and kill my mileage [no overdrive]. All these vans have a code "T" transmission, is that the AOD or E4OD??? Forgot to look at the shift indicators when I went "shopping" the other day.
Would prefer to just do a pumpkin swap, but the Ford 9" rears have been picked over quite a bit. Several of the late model ['88-'91] vans have a code 19 Ford 8.8" rear end, but I've seen "code 19" listed as both 3.55 and 4.11, and none are spin-checkable w/o dropping the driveshafts. 3.55 should be just right, but I fear a 4.11 would be too low and kill my mileage [no overdrive]. All these vans have a code "T" transmission, is that the AOD or E4OD??? Forgot to look at the shift indicators when I went "shopping" the other day.
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
Originally Posted by 83Van
This is an '83 E100 van with the 300 straight six, C6 tranny. It has a 3.00 gear right now [code 14, ford 9"] which is great for the highway but makes me slow to 30mph going uphill while towing. Looking to drop the ratio to the 3.50 -ish range for the least $$ possible. My local pick-ur-part salvage yard has several potential donor vehicles but many have bent drive shafts from being move around with a forklift, which prevents an easy "spin the wheels" ratio check.
Would prefer to just do a pumpkin swap, but the Ford 9" rears have been picked over quite a bit. Several of the late model ['88-'91] vans have a code 19 Ford 8.8" rear end, but I've seen "code 19" listed as both 3.55 and 4.11, and none are spin-checkable w/o dropping the driveshafts. 3.55 should be just right, but I fear a 4.11 would be too low and kill my mileage [no overdrive]. All these vans have a code "T" transmission, is that the AOD or E4OD??? Forgot to look at the shift indicators when I went "shopping" the other day.
Would prefer to just do a pumpkin swap, but the Ford 9" rears have been picked over quite a bit. Several of the late model ['88-'91] vans have a code 19 Ford 8.8" rear end, but I've seen "code 19" listed as both 3.55 and 4.11, and none are spin-checkable w/o dropping the driveshafts. 3.55 should be just right, but I fear a 4.11 would be too low and kill my mileage [no overdrive]. All these vans have a code "T" transmission, is that the AOD or E4OD??? Forgot to look at the shift indicators when I went "shopping" the other day.
Jason
