9" inspection


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By charliemccraney - 12 Years Ago
I think I've found a 4.10 center section. I'm going to go get it on Sunday. What should I look for before I hand over the money?

I'll make sure the pattern looks correct and that it all turns smoothly and the splines are good. The guy also says it has limited slip, but I don't believe any stock 28 spline setup has limited slip. Can I tell just by looking at it what type of differential it is?
By MoonShadow - 12 Years Ago
They were available in 28 spline. Check out this site for Id tips:

http://www.kevinstang.com/Ninecase.htm

Hope this helps. Chuck

By Ted - 12 Years Ago

Charlie.  For a limited slip carrier, look for 5/8” headed ring gear bolts and those bolt heads will be countersunk somewhat into the outer cover.  Single track carriers typically have ¾” headed bolts while the bolt heads themselves sit above the carrier cover (no counter-sinking).  Also look for a double row of splines within one side of the ring gear carrier where the axles fit.

By charliemccraney - 12 Years Ago
Thanks. That helps.

Is the ratio stamped on the ring gear?
By yehaabill - 12 Years Ago
Charlie: I can't believe YOU'RE asking questions!!! You normally have all the answers...LOL

The ring gear may not be stamped 4:10 but it will usually have the pinion & ring gear #'s

Like 41:10 or?......Trying to lower that E.T. huh?

                                                     See Ya,

                                                       Bill

By charliemccraney - 12 Years Ago
Haha. I'm just a grasshopper and have lots to learn. I know pretty much nothing about rear ends. I'm actually hoping the 4.10 will increase mileage and make it a little more user friendly in crawling or stop and go traffic since the engine has noticeably less torque below about 1500rpm but I am going to take it to Atlanta Dragway to see how it changes things. So the first round of gear testing will be for street manners. When that is figured out, I'll work on strip gearing.

I don't really need the limited slip now but it will be good to have if it is in fact equipped. I just need something that moves the truck forward and backward for testing, for now.

That is good. A stamped ratio will be much easier than counting teeth.
By MoonShadow - 12 Years Ago
Charlie,
Just one year older and you are getting foggy already?
Did you check the site on 9" rears? It's very informative althoug some of the pictures seem to have fallen off. Chuck
By charliemccraney - 12 Years Ago
I did take a look at the site.

What do you mean? Foggy about what?
By charliemccraney - 12 Years Ago
This looks like it has some pretty good info.



http://www.7173mustangs.com/thread-how-to-rebuild-a-ford-9-inch



http://www.7173mustangs.com/thread-how-to-rebuild-a-ford-9-inch-part-2
By charliemccraney - 12 Years Ago
Alright. I got it. This one is a learning experience. The ratio is not stamped on the gear, rather a part number and that number is 4210. You have to count the teeth. It is 39/13 or 3.00 ratio. It does appear to be in good shape, so if anything, I have a 3rd member that I can swap a R&P to.

It is an open differential, too, not limited slip.

Oh, and if you buy reams of paper by the case, the cardboard box they come in is a perfect size for a 9" center section. Very light duty but great for a short trip.
By charliemccraney - 12 Years Ago
FYI, for people with center sections to store, I got a storage crate from Summit and it seems to work very well.

http://www.summitracing.com/parts/sum-292009