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Original Message
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| It should fit just fine. |
| By Dave Shoe - 10/19/2001 1:04:29 PM; IP 12.2.11.131 |
It's good that you're getting a posi from 1968-1/2 or later car, because these are Traction-Lok units, earlier ones are Equalock. Traction-lok is a better design for gripping hard under load and releasing soft for easy cornering.
Any 390 Galaxie which came with 3.00:1 rear end gears is going to have 28 splines. The only real chance that 390 would have 31 spline axles is if it was a Police Interceptor. For plain 390s to get 31 spline axles from the factory generally requires a special-order drag racing ratio of 4.57:1 or so.
You should be able to remove the axles, pop out the old differerential carrier, plop the new one in, reinstall the axles (you may damage the petrified axles seals in the process - these are cheap, common, and easy to replace), add some oil, and go.
You definitely want to use a differential housing seal (the big one that connects the carrier assy to the sheetmetal housing). I've heard advise that suggests silicone seal is all you need, but this has always failed badly in short order with me. If someone suggests that you should use silicone seal and not use a gasket, please slap them for me. I can give details, but that's a whole different story. I also use permatex hard gasket sealer with the felpro gasket (a very common gasket).
You might have difficulty getting the original 9" carrier to detach from the sheetmetal housing. If this is so, be sure to remove all the copper washers which were under the nuts. If the cast iron carrier is still too tough to budge loose (even using a floor jack), then tap all the housing studs into the housing - a floorjack will definitely pop the old carrier loose now. Note that I keep the axles in place while popping the carrier loose, as this prevents the carrier from jumping very far.
The yoke on the Mustang's differential may be designed for a smaller U-joint. You have a choice of swapping yokes (not a trivial task), or buying a fairly common "adapter type" (I forget what they're called) rear u-joint which has the Ford tall sized u-joint caps in two places, and short caps in the two other places.
Note that there is a chance you have either a 9" or a 9-3/8" carrier in your Galaxie. I won't go into details, because the Mustang carrier will fit no matter which of these diff carriers your Galaxie came with.
Shoe. |
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