what do 9 inch ford rear end look like
what are they in.
how do you tell they are 9 inch rear end
and y do you put them in.


------------------
C man
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motor was a 2.8L v6 now it is
a 305 H.O. with
a th400 trany.

chrisblaster.homestead.com

my car pagewwwhomesteadcomcman.homestead.com/car.html

 

First of everyone wants to use a Ford 9" rear end because of the strength and the ease of gear swaps.

The 9" is the size of the ring gear. It's not the biggest one out there but it's the easiest one to work on and get parts for.

Like the GM TH350 transmission, Ford produced millions of 9" differentials. During the 60's and 70's they were in just about every Ford vehicle that came off the assembly line. Moving into the 80's they were only available in full size cars and light trucks.

There are no production 9" housing that are a direct bolt-in for a third gen. The aftermarket has many choices. With the simplistic design, anything is available. You can get open carriers or posi, lockers or spools. Gear ratios can be between 2.xx to 6.xx using the same carrier. Minumum axle splines are 28 and the factory also produced 31. Aftermarket can go up to 40.

The third gen 10 bolt is a tiny 7 1/2" or 7 5/8". Gear ratios can go to 4.56 but those are too much for such a tiny diff. The majority of third gens have 26 spline axles with 90-92 having 28 spline.

High HP engines can destroy the 10 bolt (mine is still surviving). Going to a Ford 9" is putting in a bulletproof differential that will last for many years of abuse.

 

Here's the url for Spohn's 9 inch Moser their selling. By all means I'm not saying to go buy it from them, just so you can see what they like.
http://www.spohn.net/index.cfm?fusea...t&productid=53

 

Did I catch that right, Stephen? You're running low 11's with a big block, and a 10 bolt???
A quick mod list would be nice. Thanks.

------------------
No guts, no glory.

 

heh heh. I don't expect it to last but I have about a dozen full passes on it so far. Although I blew up 2 big blocks this year, a parts list of everything in the car is on my web site. Click on the "Stephen's racing page".

This weekend is the last race of the season. The engine is back in and ready to go. I'm really expecting to destroy the diff this weekend but if I don't then I'll never know how much abuse it can take because a 9" goes in during the winter. I'm going to 4.56 gears with a spool and moving to taller tires. Probably 29" or 29.5".

Once I get back to the track and get some more passes in, the web site will change with all the new parts that are in the engine. Things like I don't have 781 heads any more. I now have a set of Merlins, stuff like that.

Hopefully this weekend if the air stays good and the new heads are a big improvement, I should see a high 10 second pass at altitude.

The key to keeping a tiny 10 bolt alive is to build it up to take the abuse. Then don't do high rpms drops with a manual or transbrake launches with an automatic. Both of those will shock the pinion gear too much and break the teeth off. That's still the weak link in my diff even though the ring and pinion are aftermarket gears. Nothing else in it will break.

 

Stephen, please stop these thoughts of infidelity and get a 12-bolt!

 

I have a 9" set up for a camaro that i want to get rid of. it has 4.11:1 gears, moser axles, moser mini spool, aerospace disc brakes, south side lift bars, and weld draglites. asking price $2000. email me at stroked342@aol.com
thanks
chris