Diff Gear Compadability
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Freshman User
Joined: May 2004
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From: Melbourne, Victoria
Diff Gear Compadability
hey does anyone know if i can use the diff out of a Ford Falcon XF, XD or XE on my 72 model F100 which now has a broken 9 inch diff? Also i was wondering how to tell the ratio of my current 9 inch diff so i can keep it the same.
Postmaster
Joined: Dec 2002
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From: USA
The F100 axle is likely alot wider than the Falcon axle. Falcon axles are about as wide as an early Bronco axle (the '66-'77 Broncos, not the big ones). There should be a tag on the axle with the ratio stamped on it.
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Freshman User
Joined: May 2004
Posts: 35
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From: Melbourne, Victoria
thanks
any idea on which kind of car i could find a 9 inch diff in that would be able to go into my F100?
Theres an old car yard where the fire brigade practice cutting people out of cars and you can go and take parts of the cars for free.
Most old sedan models and quite a few old utes like Ford WB are in there any thing that would be compatidble would be a great help.
any idea on which kind of car i could find a 9 inch diff in that would be able to go into my F100?
Theres an old car yard where the fire brigade practice cutting people out of cars and you can go and take parts of the cars for free.
Most old sedan models and quite a few old utes like Ford WB are in there any thing that would be compatidble would be a great help.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Fonz, Any 9" will swap in. The thing is you want to use a ratio for what you use the truck for. If you are under powered or do a lot of towing you need a rear with a higher number like 3.75 or higher. If you have a big engine and never pull loads a 3.00 would be good.
Find a flat spot and roll your truck one tire revolution and count the number of drive shaft revs. This will give you the ratio. You will need a bud to help do this.
John
Find a flat spot and roll your truck one tire revolution and count the number of drive shaft revs. This will give you the ratio. You will need a bud to help do this.
John
Elder User
Joined: Jan 2004
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From: houston
Why do you want the complete rear assembly. Just swap the center section. Just be sure you have the same number of splines on your axels as the unit you are going to use has. The two that were used I believe were 28 or 32, I think. When they are out of the housings, you can also just count the teeth to check for ratios. Saves a lot of time running down axel codes. Good luck.
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Joined: Dec 2002
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From: USA
Spline counts were 28 or 31. 28's are usually on passenger cars and early Broncos. 31's are usually on pickups. There are exceptions.
As far as "Any 9-inch will swap in"... only if it's close to the right total width. Too skinny or wide an axle and the tires won't fit in the wheelhouses.
I agree about just swapping the 3rd member, then you won't have axle width or spring/shock mount issues to deal with. 3rd member swaps with no special tools, just pull shafts and unbolt 3rd member.
As far as what other vehicles you could use a whole axle from, I'd look at other year F150's up to '79 and possibly Econoline 100 vans of similar year as your truck.
As far as "Any 9-inch will swap in"... only if it's close to the right total width. Too skinny or wide an axle and the tires won't fit in the wheelhouses.
I agree about just swapping the 3rd member, then you won't have axle width or spring/shock mount issues to deal with. 3rd member swaps with no special tools, just pull shafts and unbolt 3rd member.
As far as what other vehicles you could use a whole axle from, I'd look at other year F150's up to '79 and possibly Econoline 100 vans of similar year as your truck.
Last edited by SoCalDesertRider; Jul 25, 2004 at 01:30 PM.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Glen, 28s were used in pickups into the mid 70s and mixed use then. While center chunks with the same spline count can be swapped, the total axle setup is different on an E (van) and F and wont swap.
hpe this helps
John
hpe this helps
John
