Thread: Ford 9" sizing question

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Hey everyone! So i'm in need of some seriuos help here....i hope someone can help. I'm currently having my c-notch & 4 link done on my '35 ford 5-window and i'm having trouble determining which 9" i should be looking for. I need the rear end to be 57.5" from backing plate to backing plate, but I also need the pinion to be centered. It can be off by a half inch, but not by much more. I know that 57-59 ranchero/wagon, 65-66 mustang, an perhaps several others will work based on the specs listed here: http://www.carnut.com/specs/rear.html the problem that i'm running into is figuring out which rear ends have the pinion centered (give or take a 1/2 inch). My other concern is if the pinion isn't centered to the specs that I need, i can have the axle tubes modified at a specialty shop that's local, but would i have to buy a rear end that has a greater length from end to end to compensate for the offset? I really am confused here

You would have to get the wider rear end and have the long tube cut down . To get the combo your looking for , you will most likely have to get a axle made to work .

Close guess figure about 5 inches for wheel mount to wheel mount added to the flange to flange measurement .

Originally Posted by DaDdY's DrEaM

Hey everyone! So i'm in need of some seriuos help here....i hope someone can help. I'm currently having my c-notch & 4 link done on my '35 ford 5-window and i'm having trouble determining which 9" i should be looking for. I need the rear end to be 57.5" from backing plate to backing plate, but I also need the pinion to be centered. It can be off by a half inch, but not by much more. I know that 57-59 ranchero/wagon, 65-66 mustang, an perhaps several others will work based on the specs listed here: http://www.carnut.com/specs/rear.html the problem that i'm running into is figuring out which rear ends have the pinion centered (give or take a 1/2 inch). My other concern is if the pinion isn't centered to the specs that I need, i can have the axle tubes modified at a specialty shop that's local, but would i have to buy a rear end that has a greater length from end to end to compensate for the offset? I really am confused here

On the 57-59 rear end the pinion is centered but the pumpkin is not. Here's a pic of one in my 37 Ford. The drive shaft runs down the center of the car even though the pumpkin is off to the left. This rear end measures 57.25" from each wheel mounting surface. Hope that helps a little....

I cut and reweld my own housings but have Mosser engineering respline the axles. You will have to start with a housing greater than what you want when finished.. I think they charge 125 for the housing and 100 for the axles they are on line hope this helps They can supply ther housing if you don't have one

Daddy's Dream; Itoldyouso or Don has a nice list that he sent to me before, but I can't find it now so you may want to ask him if he still has that list for the measurements on the ford 9 in. rear ends. Kurt

Or with an after market housing you can have the drive shaft centered....



....and the pumpkin centered from the back



pay no attention to the cob webs in this pic. I'll take them down after Halloween

Here is this what you were looking for. Kurt
Click on the site below.
http://www.carnut.com/specs/rear.html
My bad thats the same thing you got up there.
Sorry.

No matter what you buy or use you will have offset due to the nature of the beast, also as this is actually built into most rear axles (pinion offset) for a reason, to make the universals do their job, that is to make them rotate in their particular cups, with out this they would be shot with in a hundred miles, so if you think you are doing yourself a favor by lining up your driveshaft both vertically and horizontally you are actually making a bigger mistake, only on true race cars (quarter mile) can get away with this.

Originally Posted by 406Rich

No matter what you buy or use you will have offset due to the nature of the beast,

Not necessarily, check photos in my post above.

Take it on a three hundred mile road tour and report back.

If lining up the drive shaft is hard on u-joints how do all the no-offset rear end u-joints hold up? Just put the pinion angle in the joint vertically instead of horizontally. The u-joint needle bearings don't care which way they are pitched, as long as they move enough to avoid creating flat spots.

How many no offset uni`s have you seen in the last 50 years or so....

My son's 95 camaro has a ford 9' in it. We ordered it with the drive shaft straight because there is no room in a camaro tunnel for anything but. It has thousands of track & street miles on it [mostly street miles] and the u-joints are fine. As I said all the u-joint needle bearings need is a little pitch to keep them rotating, they don't care if it is is from a vertical or horizontal angle.

Pro70, need to read my post again...

The 57-59 Ford will have a 26 1/16" driver side / 30 1/2" pass- side axles. Add the 1 1/8" gap between axles and 1/4" for drum thickness and you have 57 11/16" total. Pinion approximately centered. 65-66 Mustang will have 26" driver side / 30 1/8" pass- side axles. Also add 1 1/8" gap and 1/4" for drums and you have 57 1/2" total drum to drum. Pinion approximately centered. Hope this helps.