yet another axle code ? (sorry)
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Senior User
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From: western ky
yet another axle code ? (sorry)
i know you've read the question "whats my gear ratio???" many times on here, so forgive me. however ........... the tag on my axle (dana 60) can't be read, and the door plate says its axle code 38. my chilton book and parts catalogs don't list that code for 1972, and the closest year that does have it is listed as 3.73 which i seriously doubt. it feels like a really low gear, but maybe thats becuz it has a t-18 "granny" 4 tranny. note that the repair manual shows a 38 under axle in the sample 1972 vin plate, but doesnt have it in the chart. geniuses. anyway i searched and came with up with axle code decoder on this site, but its only for 80's on up. also my parts truck is a 76 and its axle code is 22. again, not listed for that year, but this one i think is a high gear. any help appreciated. i know the 72 f250 was special ordered, but doesnt have the ratio on any of the dealer or factory paperwork.
Posting Guru
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Here is what the "red book" shows for axle ratios for 76
3:1 02,12
3.25:1 07,15 or17
3.5:1 B8,B9,H2,08,11,16,or18
3.54:1 C7
3.7:1 A2,09
3.73:1 D6
411:1 A3,H3,03 or05
4.56:1 28
The code for 72 3.73:1 36,38 or C8
3:1 02,12
3.25:1 07,15 or17
3.5:1 B8,B9,H2,08,11,16,or18
3.54:1 C7
3.7:1 A2,09
3.73:1 D6
411:1 A3,H3,03 or05
4.56:1 28
The code for 72 3.73:1 36,38 or C8
Last edited by merlynr; Sep 5, 2005 at 09:01 PM.
Thread Starter
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Senior User
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From: western ky
i appreciate it! i knew my tranny is geared low, but the running gear felt lower. guess it aint!
however, the "22" for the 76 still has me stumped. it is the code stamped under "axle" on the vin plate right? i suppose i could jack it up and turn the driveshaft and tires.......
however, the "22" for the 76 still has me stumped. it is the code stamped under "axle" on the vin plate right? i suppose i could jack it up and turn the driveshaft and tires.......
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Dan, You can get into different issues with open & locker rears, one wants both wheels off the ground and the other one. IMHO The best method for checking for ratio is roll the truck (on level ground) one tire revolution and count the revs of the driveshaft. You can make a mark on the ds or tape a string to it. This will take the guess out.
While your tranny has a 1st with big ratio for starting out the final ratio is 1 to 1 just like all non overdrive trannys. At 1 to 1 the driveshaft is turning the same rpms as the crankshaft. Coming up through the gears the engine is turning more than the ds. At OD the driveshaft is turning more rpms than the crank.
hope this aint too confusing
John
While your tranny has a 1st with big ratio for starting out the final ratio is 1 to 1 just like all non overdrive trannys. At 1 to 1 the driveshaft is turning the same rpms as the crankshaft. Coming up through the gears the engine is turning more than the ds. At OD the driveshaft is turning more rpms than the crank.
hope this aint too confusing
John
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