hey whats up out there, i got a few interesting questions tonight, i have a 1989 ford bronco 5.0 v8, 5 speed. now ive got a ford 9 inch rear out of a 69 f100, what do i need if anything to make it work? should it bolt right in? any modifications to the pinion angle? or the gears? how bout the brakes on it? i just gotta go through it and change the oil and stuff.
one more thing i dont like the aluminum master cylinder on the thing, even with the new ones the feel of the pedal is kinda sucky, i dont care about loosing the RABS, unless its gonna screw with the way it runs. is there anyway to modify it so it works on the old school cast iron master cylinder, i just want that solid feel in the pedal you got with the older trucks i mean it stops great theres just an awful lot of pdeal travel, i replaced the master cylinder, and i bled the crap outta those brakes, new calipers everything it could it be the proportioning valve? what would i need to convert to the cast iron cylinder? would it hurt anything? how bout the calipers and wheel cylinders? do those need to be changed?

 

You should be able to get away with a 9" swap. I am curious as to why the change is necessary since your post mentioned nothing about any failure to the rear axles or gearing. You may need to change the pinion flange to a yoke on the rear driveshaft. I cannot recall at the moment when Ford changed the driveshaft-to-pinion input from a yoke to a flange.

You will lose the RABS since a 9" has no provision for the VSS (Vehicle Speed Sensor) and while you can move the VSS to the transmission or t-case housing with an adapter kit, it still won't give the ABS computer accurate wheel lock-up/slip information due to the location change.

As to the rest of the braking system, if you are going to do the 9" swap, I'd wait and see what happens to the system after that swap since you are changing rear brakes anyway. If the pedal won't stiffen up like you expect it should and the bleeding process has been exhausted, then the hydraulic cylinders ALL come into question and should each be checked for leaks including the MC that is in the truck now.

 

What Greystreak said,

Also, I'm not sure where the cruise control gets it's information. So you might lose it if it comes from the VSS.

Not sure about aluminum verses cast iron. But I would doubt that is your problem.

 

well there are a few reasons im putting in the 9, 1 is, its stronger overall, not that im offroading or anything, and ive invested (when i had my 69 f100) in a ton of new brake parts and such to put into it so i figured why not put it in, i have to swap the frame on the truck anyway cause this one has some rot through, its only in a few spots, but ive delt with alot of rot, and if ive learned anything its that where theres a little, lurking elsewhere , theres more so i got the fram off a 95 to put in my 89, same frame in alot better condition.
i will wait to see if the pedal stiffins up with the rear swap, but is it possible to put that old cast iron systmem in, and will the calipers and wheel cylinders need to be changed? i know the proportioning valve will have to be swaped thats a given.

 

Many will argue that the 8.8 can handle damned near everything a 9" can but I'll leave that alone.

H, prior to the E4OD becoming the ONLY auto in the Bronco/F-series 1/2 tons, the cruise was still mechanical so it shouldn't be a problem for his 89 as I believe the AOD was still available at that point in time. Once the E4OD was the only automatic, Ford opted to use the VSS to provide the cruise control information since it was already doing double duty with the E4OD and ABS info.