Widthwise,no.67-72 are narrower than the 73-86 150's. 72-older are 57'',73-up are just under 59''. I "think" the Towncars are like 60-61''. I know 67-69 T-birds and early Torino's are narrower,but I don't know by how much.
The differential carrier (pumpkin) is the same, but most (all?) of the big passenger cars had coil springs. Small cars (Mustang, etc.) with big engines had leaf springs, but there were at least two wheel-bearing sizes. There are at least two different axle spline sizes (28- & 31-spline?) and different axle lengths. (Wheel bolt circles were not the same for truck.)
Other people can fill in details, but it would help if you stated some details to narrow down the discussion. I believe there are combinations that will swap, but most will require some adapting or re-welding spring perches, etc.
The carriers are different, it depends on the size of the ring gear. 9 3/8" ring gear uses a different carrier than the 8 3/4" and 9's. These three sizes are all consider 9 inch rear ends, btw.
First 31 spline 9 inch rear end offered in 1968....BUT....the 28 splines were used prolly 90% of the time. From research, I have found that the F100 Camper Specials made 1968/72 prolly are the only F100's that used 31 spline axles as standard equipment. The 9 3/8" ring gear was also a Camper Special feature. There were no F100 Camper Specials made after 1972. NOTE: The 31 spline HD axle was also an option on all 1968/72 F100's
In 1966, some of the pinion bearings changed, and again in mid year 1970, when slim line axle bearings were used on some axles.
What does all this mumbo-jumbo mean? Looking at a rear end in a boneyard won't tell you much. You'll need the rear axle tag number to define what rear end it is. And the tag numbers are usually missing, so pulling the axles is the only way to know.
WEY and WFF are the only axle codes that use a 9 3/8" ring gear 68/72.
WEY, WFF, WDM-H-J-AH & AJ are the axle codes for 31 spline rear ends 68/72.
Wheel bolt patterns: Trucks 5.50" / Cars 4.50"
It's never easy, is it.
Last edited by NumberDummy; 03-06-2007 at 08:10 PM.
I guess you better put a truck rear end in it - then you can post about it in these forums without catching flack. (Just kidding . . .)
Measure it up carefully: center-to-center of spring perches AND distance between wheel-seating surfaces on the brake drums. You can have fun using different wheels offsets to fine-tune this. (Are you going to change out the front end to Ford Truck disk brakes? (If so then you can learn all about them on these forums.)
I only have two since I sold my '65 F-100. I once did have five as well (if you count 1 Mazda), but I am cutting back . . .
I did see your signature & was just kidding. I was making fun of the rules concerning "Ford truck" content, not you. I try not to break the posting rules, but at least I should be able to mock them once in a while.
By the way: Ford did put in 9" axles in some of the big-engine, small cars which normally had the 8". They are hard to find, but would probably fit better if you could find one. Then you could stick with passenger car wheels.
imo, You should stick to the 77 (I think this is when it started) and later model 9" axles because when you call for custom aftermarket axles and lockers, the most options are for the 31 spline axles with the seal installed on the axle shaft and not in the housing.
Kind of a been there done that routine when I nuked my early model housing and axles.