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08 = Ford 9" Rear Axle / 3.50-1 / No Limited Slip / 3,300 lbs. Rear Axle Capacity
1965/67 F100, is a direct swap, common ratios are 3.25 & 3.50. 1961/64 will also fit, but most have 3.70, 3.89 & 4.11 ratios.
1968/72's have different rear brakes than 1961/67's. 1973/79's have wider rear frames rails behind the cab than 1961/72's, so the housing is different.
Note: If your truck has a two piece driveshaft, it uses different u-joints than with a one piece driveshaft.
The companion flange on the rear axle is different, so if you buy another rear axle, you may have to swap the companion flange.
Take it to a drive train shop they can straiten your current axle, reiforce it, shorten it any thing you want. I've done it plenty on race cars. I can recomend two people one in mobile, al. and one in gulfport, ms.if your in my area.
I agree. I've hit some really big holes and never done that kind of damage. Take it to one of the drivetrain shops in your area and have them give you a quote. I wonder if your guy is wanting the rear end for a personal project.
1968/72's have different rear brakes than 1961/67's.
Bonus!
The '68 - '72 rear brakes are wider than '67 and earlier, and are the same on F-100/150s up to '79. If you can get a complete '68 - '72 rear axle, it will upgrade your rear brakes, and is properly paired with disc brakes, if you ever plan to do that upgrade.
It does make a difference in stopping power.
Even if the ratio you find isn't what you want, you can install your current 9" third member or pumpkin in the replacement axle, provided the spline count on the axle shafts is the same. (Unless the third member was damaged somehow which seems unusual??? They are pretty strong.)
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