droptine

I have a ford 9" out of my mustang that I am wondering if I can change it from an open to a locking.... is there a kit that can change them over?
Can I get a locking 9" third member and put it in the housing from the original open rear end?

cmanf

I bought a Currie trac-lock 325 28 spline witch you need to know if its 28 or 31
think it was $1200 and dropped right in all ready set up shimed out and adjusted

kalli

i got the one from ford racing. the one I got was 31 spline, so make sure it'll with your current axles

but to answer your question: i don't see a reason (apart from axle spline count) why you can't put in a trac-loc

better said, i got one from quickperformance.com. they put Ford racing parts together for me.

Kalli

Starfury

Why do you want a locking rear end? If you're using it on the street, an auburn or TrueTrac would have better manners.

71stang99

I swapped mine out for a traction lok, bought the pumpkin off of craigs list and had a local mechanic do the rebuild and swap out the gears for 4.11 (I have an AOD) and you might as well have the clutch pack rebuilt (kits with the clutches are available)

2+2GT

Um, just to avoid potential confusion, Traction Loc™ is Ford's name for a torque-sensing friction-clutch type limited slip differential, it doesn't actually lock. Pretty much standard on V8 Mustangs since the 70's.

The best known locking diff is the Detroit Locker™, which truly locks solid when appropriate. The 65 GT350 had them, and some later "drag pak" cars. They tended to unlock with a bang, scaring people, so mostly only those in the know who really wanted them had them. Newer versions are not so violent.

Starfury

I know that:-| He said he was looking for a locking rear end.

2+2GT

I figured you did, but you posted before I clarified my response, just too darn quick for me.

I wanted to expand on the remarks for other readers, who may not know.

OCHOHILL

I am wondering the same thing. I am building a 66 restomod. I researched improving the stock 8" rear end with gears and a traction device. I also researched doing the same for a 9". They were the same cost. So, I found a 9" housing that will work and I want to change the gears and add a traction device.

The frist question is: Is there a vehicle in the wrecking yard that I can buy a used 9" 28 spline center section with a traction device? Through research I found out that many ford trucks in the late 60's and early 70's had the same 28 spline housing as mine with taller gears and a traction device. Some time in the early mid 70's ford went with 31 spline center sections and axles.

The second question is: If I find a 31 spline center section with the gears and traction device can I change out some of the internals to fit 28 spline axles?

Starfury

You found a 9" axle housing that has the proper width for your '66? Or you found a 9" center section? In case you're not aware, you can't bolt a 9" center into an 8" housing.

To answer your second question, the axles are splined to the differential. If you get a 31-spline trac-loc unit, you need 31 spline axles, or a 28 spline trac-loc unit.