Before I assemble the suspension on the rear of my 67, I thought it would be pointless to stick my stock differential back on there since I want to change it soon anyways. So, right now I'm surfing the net for Mustang diff's. First thought was Currie, but I about went into cardiac arrest when I got my qoute price. Anyone know another respectable business that has good differentials?

I figure this should be a good time to go all out and get my gearing and brakes I want aswell so here's what I'm thinking. 9", posi, 31 spline,3.70, 11" disc

Can someone explain the difference between the stock gear case &pinion support compared to the 9-Plus sportsman Nod. gear case & big bearing pin support. Also the differences between traction lock, truetrac, detroit locker, ARB air locker, and spool? What should I be interested in?

Im not making a drag car, but I want something that will launch hard and hold its own. I want to do this right the first time. Thanks guys!!

Nic

Oh, and if it matters, 351W, autoc4, 67 coupe

 

ttt, anyone?

 

An eight inch will do in most cases. If you want a nine inch, use the search feature for more info.
Jim

 

trac lock = clutch type LSD (ok for most applications)
true trac = geared type LSD (later version of the detroit locker)
Locker = race style geared LSD (very harsh engaging)
Air locker = truck parts
spool = both wheels locked all the time (race application only and not ideal for street)

I would take the true trac every day of the week and twice on Sundays. I cant speak for US prices but over here its line ball between true trac and trac lock in terms of cost and the true trac slaughters trac lock for performance and durability.

PM Gunjam - he just fitted one.

 

I don't think you will hurt a 9" period. Unless you plan to use drag slicks and can bust 400 or so ft/lbs of torque. A350 or up should be fine (I like 350's). I would look to the used market for a 9" rear. As far as type, a trac loc or posi would bewhatI would choose. The traction loc will hahve one extra clutch over the posi but either would work. Lockers are OK but can be a little dangerous on a wet road. I normally try to buy a set of used Ford Explorer rear disc. If you are fairlygood at fabbing, these can be easily adappted to the 9" housing (small bearing). It will require a couple of spacers for the space created by the mounting bracket. You may want to look over this info as it will help.
http://www.kevinstang.com/Ninecase.htm

 

I typed a big long response which got eaten by the server upgrade. This one will be markedly shorter.

Stay away from the lockers and spools for a street driven car. Go with the trac lock or truetrac, preferable the truetrac. A nodular iron case is stronger, but if the savings is large, a standard caseshould do fine for all but high horsepower or racing conditions.

Quality axles using new parts cost a fair bit of money and there is no way around that. A cheap axle swap requires a junkyard find which is more and more difficult. Even then, they often require rebuilding which can add $500 to $1000 including parts and labor. I've had two different 9" axles done by other shops and one turned out mediocre, the other even worse. I've had two Currie axles, along with countless friends who have had custom axles built for the Jeeps. All were excellent.

If you're not already tearing up axles, fix up what you have and save your money.

Good luck!
Jeff

 

I already have a 9" on my car but like everything else that came with my car, I want to replace it. This won't be a drag car, or daily driver, so I'm just looking for something that will launch good and last. I wont be out there tearing it up, so I dont need the highest quality stuff, just good.

It seems like alot of you think the true trac is good, perhaps I'll consider that. I still have to read up on this..

Id rather get something new and ready to go, than scravenging yards and piecing it together with older stuff.

 

Replace the housing or replace the gearing. You need to be a LOT more specific.
Jim

 

I would just put a traction-lock in it and use the stock axles, third member, and housing.
Then again you could be insane like I was in my youth and weld the spider gears together to make a poor-mans locker. The stupidity of youth.

 

Aussie66, are you running a true trac? Im looking for one to fit to my 8" but haven't had much luck here in Aus. I've done some digging on the powertrak, but can't get on to any distributors.