Posted By: rtplumcrazy1
340/727 to a 440/727 same driveshaft? - 11/20/10 02:42 AM
340/727 and 440/727 can you use the same driveshaft-changing a 71 Road Runner that had a 340/727 combo to a 440/727 combo-will the driveshaft interchange-the car has an 8 3/4 rear end thanks Daren
Posted By: scratchnfotraction
Re: 340/727 to a 440/727 same driveshaft? - 11/20/10 02:47 AM
yes as long as both 727 have the same length tail shaft housing
meausre from mount to end of housing
should bolt right in same yoke and length
Posted By: generallee6901
Re: 340/727 to a 440/727 same driveshaft? - 11/20/10 03:33 AM
Will fit.I have done the same thing on the same kind of car.
Posted By: dragaddict
Re: 340/727 to a 440/727 same driveshaft? - 11/20/10 06:04 AM
It will fit but if the car has the small yoke u joints in it I would think hard about upgrading to the larger ones. I had a 69 B body converted from small block to big block and the diveshaft lost a front ujoint at 70mph with 4:10 gears and it was not pretty. New driveshaft,trans,radiator,and the stock 10" drum brakes were scary as this pos was breaking up under me.
Lots of changes and upgrades since and the stock driveshaft was rebuilt with new u joints not too long prior just wasn't enough this time. You can do it but if you plan ahead and upgrade the car before you break stuff it is easier and cheaper