a friend of mine offered me a ford 9" rearend for free off of a 67 ford fairlane. will this fit under an f-150 of around my year? thanks....

 

donate54,

i don't know if it will fit, or not. only way to tell is to measure it out. i would think it should be close. you will have to change out the yoke and re-weld the spring pads and other basic things if the length is ok. i hope it works for you. the 9" is a great rear-end. tons of gears and lockers, and if i remember correctly they are priced right for the 9". i have had many of these in cars and trucks and they are bullet-proof. btw, the 9" has the third member that drops out, one of the easiest ever to change gears on. good luck, Rich

 

9" Ford is one of the best diff's. ever produced; however, it is not compatible with anti-lock brake systems. No way to install the tone ring on the ring gear. The tone ring picks-up the electromagnetic signal which communicates with the vehicle onboard computer.

When switching out a 8.8" to 9"--you will have to lengthen your driveshaft too. 9" pinion centerline sits lower in the chassis than 8.8".

Driveline angularity would have to be changed for a 9" to work.

 

Donate54, Sorry for not reading your post exactly! You should be able to take a 9" center section out of a 1967 Fairlane, Galaxie, Torino, etc. and install it into a 1963 to 1979 F-100.

Watch out for different pinion yokes--ford used many different u-joint sizes at diff. yoke (eg. 1310, 1330, 1330 ford "special" and S55 saginaw). I have only found (2) different height yokes (which would effect you driveshaft length).

Many times, if Your old yoke and replacment diff. has different cap size (diameter) and distance across u-joint, You should be able to take your driveshaft to a qualified Dana Jobber and get a conversion u-joint that will make you change work for you. Remember check the height of the yokes--they must be the same, in order to prevent a driveshaft lenght change or catastrophic driveline failure after switching diff's.

Only other thing to watch-out for on 9" ford conversions: axle splines. All older cars should be 28 spline. All F-100's (that have never been changed) should be 28 spline. F-150's should all be 31 spline. Check axle splines and verify they are the same before switching out any 9" diff. center section.

 

thanks for the help guys. theres a really good article on 9" rearends in the latest fourwheeler magazine for anyone who's interested. very informative.