All V8 Mustangs had the "quick change" rear. I'm told professionals at the strip could change it in a half-hour. I've never seen it done in less than an hour, though. Of course, that was on the lift in a shop, not at the track under pressure to get it done quickly.

Essentially, you jack the rear of the car, pop the wheels and drums, pop the axles, drop the driveshaft, zip the diff bolts off, drop the diff, pop in another diff, zip the bolts, squirt in the fluid, stick the shaft back on, slide in the axles and drums, zip the wheels on, done. Couple three guys with air tools and all the right sockets on them could do it.

Such a superb design you could look under Chebbies and find a Ford rear. Probably still do.

 

By quick change, I mean less than 5 minutes. My family has run them in their stock race cars for years, so I always wondered if you could put one in a Mustang.

 

Ah. You can put anything in anything. But why would you want to?

 

Haha! I guess the question is if you could, why wouldn't you want to. They are comparable in price to conventional rearends, with much easier gear changes, when you want to or need to change gears. The are essentially direct drive as well. Just trying to get some opinions on it.

Tim

 

"Comparable in price to conventional rearends."
You must be dreaming. I can buy a Ford 9" for a couple of hundred dollars. I don't see any prices on those quick change rearends but I'm guessing at least a couple of thousand dollars.
Of course it would be nice to have one but it's gotta be expensive.

 

http://www.hotrod.com/how-to/transmission-drivetrain/1010sr-quick-change-rear-end/

A good read...

Tim

 

The only downside would be that most have straight cut gears, so it would be noisy.

 

I didn't think about how noisy it'd be. Good point!

Tim

 

I have a QC in mine its been in 3 of my Mustangs.

 

What do you have now? Can you provide any more details? Pics?

Tim

 

Biggest issue off the top of my head is the gas tank and some of the sheet metal just behind the center section to make clearance for it.
Initially had to RAISE THE GAS TANK on a 2 x 10 frame, cut a section in the sheet metal to clear spur gear cover. Had to turn the tank around so filler is in the trunk. Later plans were the purchase a fuel cell found a 22 gal one that would clear the QC purchased the can but not the cell so far. Sheet metal mods still would be needed .

Oh on the first 69 Mustang it was in got to crash test it with the tank mounted on 2 x 10s I was at a full stop. Was hit in the rear by a full size late 70s early 80s Oldsmobile GOING 55 MPH it totaled the Olds no real noticeable damage to my Stang drove it for a couple more years before it had the front end tore off it when a guy ran a red light . rear end then went in a 73 Mach I NOW IN MY 70 guy took the side off the 73

 

lOOK INTO THE Winters Hot Rod rear ends they might be a bit shorter in the Spur gear portion of the case. I purchased bevel cut spur gears just for my highway/ daily drive gear ratio.

The straight cut gear noise wasnt all that bad just kind of a humming noise. Exhaust was more aggravating

 

If the quick change rears you have at your disposal have a spool in them that would not be ideal for street diving. If you have a diff. you can unlock your ok.

Advantages: Time needed to make a gear change
Each gear set will give you 2 ratio's depending on whether you use the larger gear on top or bottom (vice-versa).
Larger wheel bearings
Just the cool factor of having one under your stang.
10-in. ring gear

Disadvantages: Noise
Room under the car
Weight, your going to be a little bit heavier if you use steel axle tubes

 

Winters have tornson diffs as standard weights around 125lbs the hot rod rears have 8" ring and pinion champ rears 11" if remember correctly..Relay like mine even though its a spool and still uses ford truck bells, tubes, axles, hubs and drum brakes with 8 lug 3/4 1 ton from the 40s 50s. It weighs more than a SBF. It corners great possibly ddue to the weight biased to the rear along with tires sizes 275 50s front and 295 50s rear.

Winters Performance

 

Check Speedway, they have a lot of qc axles and parts in their catalogs.