ID rear differential ?
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Laughing Gas
Joined: Jun 2014
Posts: 751
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From: Pagosa Springs CO.
ID rear differential ?
I learned today there is a difference in 9.75 differentials , 1999 and earlier are slightly different than 2000+.. pinion bearing size maybe? didn't really get an answer from Randy's R&P Is there a way to tell the difference without pulling the pinion and ID'ing the pinion bearing ? I'm considering 4:56's and they are not available in the 1999 and earlier.
My truck was built in October 1999, it's possible it got the upgrade.
My truck was built in October 1999, it's possible it got the upgrade.
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Joined: Mar 2017
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Look at the axle code on the door jamb sticker. Then google it.
Identify Your Ford Truck Axle From The Door Sticker : Blue Oval Trucks
Identify Your Ford Truck Axle From The Door Sticker : Blue Oval Trucks
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There are numerous different rear ends that were used on the yr 2000 model trucks. Different gear ratios with different carrier/tube configurations...each with their own unique identifier. 4:56 gears are not and were not standard on any F-150, F-250, F-350, F-450, or F-550 that I can find. I haven't checked F-650's or the 700's or 800's.
Is there by any chance a sticker on your axle tube that will help identify it?
For example, stock 3:31 R&P ratio would have the sticker with either SD916A, SD916B, or SD916C on it, and each carrier/tube combo would be specific for either rear drum brakes or rear disc brakes.
3.55's: S918 D, E, or F <or> S919D, E, or F <or> S933P <or> S941A, <or> S942A (drum or disc for each option) <or> V918A, V918B, V919A, or V919B with disc brake configurations only.
3.73's are identified with S923D, E, or F with either drums or discs.
Those are the only options for stock replacement rear ends for a 2000 F-150. F-250's are slightly different and the same goes for F-350 etc.
Does that help some or does it just muddy the waters? If your truck has a build-date of 10/99, it is included in the 2000 year model truck line.
Is there by any chance a sticker on your axle tube that will help identify it?
For example, stock 3:31 R&P ratio would have the sticker with either SD916A, SD916B, or SD916C on it, and each carrier/tube combo would be specific for either rear drum brakes or rear disc brakes.
3.55's: S918 D, E, or F <or> S919D, E, or F <or> S933P <or> S941A, <or> S942A (drum or disc for each option) <or> V918A, V918B, V919A, or V919B with disc brake configurations only.
3.73's are identified with S923D, E, or F with either drums or discs.
Those are the only options for stock replacement rear ends for a 2000 F-150. F-250's are slightly different and the same goes for F-350 etc.
Does that help some or does it just muddy the waters? If your truck has a build-date of 10/99, it is included in the 2000 year model truck line.
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Laughing Gas
Joined: Jun 2014
Posts: 751
Likes: 94
From: Pagosa Springs CO.
^^^ this is correct, but without pulling the pinion seal and getting getting the pinion bearing number according to Randy's RP I can't get 4:56's for a pre 2k 9.75 RP, so until I find another way to ID the differential I won't be regearing too soon.
Hope that makes sense.
Hope that makes sense.
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Joined: Mar 2017
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Mickey, do you have a micrometer? You can try measuring the pinion output shaft and I can try to match it up to known parameters...I've got tons of 9.75's on my yard.
steve(ill), who's the member on here who specializes in all the Ford numbers? I've seen him on some of the other boards and his knowledge base is pretty amazing. Any chance he would be able to help with all of this?
steve(ill), who's the member on here who specializes in all the Ford numbers? I've seen him on some of the other boards and his knowledge base is pretty amazing. Any chance he would be able to help with all of this?
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