Diff query

72 Stang · Post by **72 Stang** » Fri 26 Mar 2010, 19:02

Hi Guys
How do I identify a Ford 9" diff and what would a good ratio be for a 460 with C6 auto box, thanks.

PeteLeathersac · Post by **PeteLeathersac** » Fri 26 Mar 2010, 22:39

Click here...
http://www.enjenjo.com/9inch.html

Are you putting it in your Mustang?.

~

drgfinger · Post by **drgfinger** » Sat 27 Mar 2010, 06:11

Your best ratio will depend on a lot of things , the wheels and tyres , stall speed of the box , the engine characteristics , intended use of the vehicle , wheter you intend to use an overdrive box in the future etc, weight of vehicle etc.
In general , you would find a ratio from 3.25 to 3.5 will give you the best compromise between acceleration and top end , under that will give you better long distance fuel consumption , over that and adding a 2000 stall will give you violent accel and a hugh revving highway speed.
I was running a 3.75 with a 454 and a 9" diff , 295/50/15 tyres - 1500kg vehicle , no stall and it was quite irritating. Considering I was at 280 kw and 700nm torque and a 6000 rpm engine , I went down to a 3.0 , the huge torque of a Big Block coped well , I lost 0.1 sec on the quarter mile , but highway driving was way more relaxed and fuel useage went down.

OldSkool II · Post by **OldSkool II** » Sat 27 Mar 2010, 09:52

72 Stang wrote:Hi Guys
How do I identify a Ford 9" diff and what would a good ratio be for a 460 with C6 auto box, thanks.

howzit
3.25 would be a good allrounder

to identify
cant get to the bottom 2 bolts with a ratchet and extension
must use a spanner

j1autotech · Post by **j1autotech** » Sat 27 Mar 2010, 15:25

OldSkool II wrote: to identify
cant get to the bottom 2 bolts with a ratchet and extension
must use a spanner

As OldSkool says the bottom two nuts can only be loosened / tightened on a 9" with a spanner. A Ford 8" can be reached by a socket set like the rest of the nuts on the diff centre.

Hope these pics help out.

J1

This is a 9" rear end showing the two nuts that can only be worked on by a spanner

This side shot shows the 9" pinion carier getting in the way of using a socket set

This is an 8" rear end showing how the two nuts on the bottom of the carrier can be worked on by a socket set

72 Stang · Post by **72 Stang** » Sat 27 Mar 2010, 19:09

Thanks for all the feedback guys, great help

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