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I have a 66 6cyl coupe that has a considerable ammount of play in the rear axl when you turn the shaft. It bangs and jolts the car when I shift and when I brake. A friend says that it is "missing teeth". Seems to make sense, but I know little about the inner workings of a rearend. Does anyone know if this is common or if it sounds like what I have described is caused by "missing teeth"? A replacement seems easy enough to find and I have heard that to have one rebuilt is pretty steep. Any suggestions or clues would be greatly appreciated. Thanks.
 

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Much whining going down the road?...(rear end, not you *G*)

Likely just a bit loose on the backlash from 30+years of service....

I'm guessing you have a manual trans, which would accentuate this problem....

Missing teeth or parts of teeth would make for some interesting noises and you'd hear them all the time....

If your car isn't a restoration, you might consider looking for an 8" out of a V-8 65-66 Mustang or other similar Ford product and swapping rears.....especially if you think a V8 might be in your future...
That would likely be less expensive than rebuilding your rear....at some point in the future you'd have to rebuild the 8" but FWIW, I've got 200K now on the original rear in my D-coder....works great...new axle bearings 13K ago...

Pat
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I would replace.... Who knows what parts are bad and where to get them? I would replace both axle seals and pinion seal before I installed a replacement rear.

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I agree with camachinist, go with the 8". Not only is it a lot stronger but it also has BIGGER brakes. While your at it, try to score a pair of front spindles and drums for the front off a V8 too!

You might also want to check out an 8" from a Mustang II. They came on 6 and 8 cyl models and have 4 bolt wheel pattern too. I'm not sure on the width though, you'll have to check it out.

Tom
You can do anything you want to......ONCE!
aka "my 66 coupe"
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Definately upgrade to an 8" if you can. I've broken 3 rear ends in 6 cyl mustangs (all were old and not rebuilt), the last one ground the pinion into the front of the case locking up the rear tires at 65MPH spinning me around 3 times on the interstate. I ended up facing the wrong direction in the fast lane, lucky for me I went to work at 11AM.

I've had 3 V8 mustangs with 8" rears and have never broken one.

Where are you located? I have an 8" rear out of a '67 for sale.

Jason
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MY 66 fb v8 rearend whines on takeoff up to about 40 then stops.( sounds like tires are rubbing),but there not,, you think axle bearings?
 

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That's a good approximation of the noise I heard from my D-coder prior to replacing the axle bearings....at a certain point, the pitch got high enough to become lost in the other noises of the car, road and wind....

Check 'em out...*G* You'll feel it when turning the axle by hand... at least I did...

Pat
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