I have a 2001 F150 Supercrew with the 9.75" rear axle, and I bent my rear axle last week. Obviously time for an upgrade..... So, my question is, wouldn't the 9.75" rear axle found in the newer f150s be stronger than the 9" that it replaced? It seems like every built rear end is based on either a 9' or the 10.5" on full race rear ends.

I have searched everywhere I could think of to get a good explanation on why the 9" is a better platform than the 9.75", but haven't found anything. Is is simply a matter of better availability, or is the 9" really stronger for some reason?

Thanks!

 

the 9" imo is just a great axle, only reason it was shy'd away from was cost?

 

Are you racing the truck?

A 9.75 axle is similar to a dana 60 with the exception that the D60 uses thicker axles 35 spline vs. 34 spline and is an 8 lug pattern. There have been several comparisons of the 2 axles as salvage yard D60's are becoming harder to come by.

A 9" axle is used in race applications (NASCAR) due to its strength and the lighter weight of the assembly. I also believe that its used due to the ease of setup in the rear end. A Ford 9" uses a third member which unbolts from the axle housing and houses the ring and pinion. The drivetrain components can easily be setup within the third member and the entire assembly bolted right back up to the axle housing.

 

No, not racing, but it is set up as a prerunner. I am looking at something like the following :

http://www.currieenterprises.com/ces...e.aspx?id=1564

http://www.9inchfloater.com/Complete...rEnd_35_40.htm

Or, I may go with one of these, but they are $$$$:

http://dirt-tech.com/tp_axle_housings.html

I am just tring to learn as much as I can before I make my decision, and it seems that "bigger is better", so I was just surprised that the 9.75" isn't used more. I can't find any discussions online about why that is.

 

the 9" is used more because it gets the job done and is very user friendly.

im sure the 9.75" could be at the same point by now if more interest was taken in it but i think its a much heavier axle with not enough gain in strength. bigger is not always better.

 

From what i have seen the 9.75 is stronger..

and if your bending your tubes n stuff...

get axle trusses... and a stronger cover...

I feel that the ford 9 would be a downgrade...

how did you bend it ?

 

huh? a 9" as a downgrade? how!? you can POUND that axle with power that you and i will NEVER be able to afford.
the 9" is lighter, a little bit narrower, has a unbeatable track record for strength. the only downside i personally see to a 9" is the fact it dont have room for a tone ring. but that wouldnt stop me from tack welding one up to the ring gear and drilling a hole lol.

yes if your bending axles, you might want to consider truss/traction bars to help keep it in line.

 

dont say i cant afford you dont know me..

its more along the lines of what do i need

im not trying to hate on you just saying..

12 grand and i could build my truck to push 700-1000 hp at the wheels

thats built trans
built motor
turbo setup
tuneing
carbon fiber drive shaft

and i think you could afford it to...
i hope

 

ssj4shane, don't be a little boy and turn this into a pissing contest. all he was saying was that the 9'' can handle a LOT of power, and it has been proven.

 

I was not trying to do that i was just saying that i feel its something we both could do just we have other things that are more important