I’m working my way towards installing a decently built 347 in my ’71. I’m estimating FWHP at 400-425. I’m not looking to beat it up or race it, but I’m wondering if the driveshaft that was once behind the 170 will be up to the task. Who out there is running a stock driveshaft behind similar HP? Any issues? Thanks, Micah
I've been.........on one for 7-8 years. it's been behind my...302...347...LSX...slicks 2-3 times...Detroit locker...no problems. as long as you are on...street tires...you should be good.
LOL.. gear head humor.. gotta love it. I think Frank nailed it. No deep gearing, high stall convertors along with sticky tires in your future?.. then you'll be fine. Just make sure you use stout aftermarket u-joints, is all. Personally, I still wouldn't run that puny little thing on a stout little 302, much less a stroker motor, but I tend to overkill everything I do anyways.. so there's that.
youve went through the trouble of building or buying a motor that has that much power why not make sure youre not going to break something and upgrade the drive shaft and ujoints. do you have any kind of stall in your car? when I was starting to build a 347 my engine builder said I should have atleast a 2500 stall to make the engine run right
I'm running my stock drive shaft, probably have about 450rwhp and its still holding. That said I haven't put slicks on it yet, and my moneys on the 8" letting go first.
As a FYI a '68-'70 Stang with C6 & 428 uses a 3.5" diameter D/S with 1330 U-Joints that is same length as a 2dr Mav(Mav is 46 5/8", Stang 46 19/32")... Yeah good luck on finding one at a reasonable price, no doubt the 390 & C6 optioned Stangs would have similar...
It will be an AOD, stall will be around 2500 RPM, 3.55 rear, posi, no slicks. Car is getting way over budget. If there is something that I can safely run, I would rather put the money in another area. Micah
it's not the total hp that kills them.. it's the sudden shock of hi-rpm/hi-torque loads associated with drag racing launchs that twists them up. Run aftermarket u-joints.. keep in mind what you have under there when you're getting a bit too crazy from dead stops(street tires will just break loose before any shaft damage ocurrs anyways).. and put your money elsewhere.
NOOOO WAAAY a maverick or comet going way over budget thats unheard of these cars were and are still so reliable. they were built to last forever. how can it possibly go over budget? you shouldnt have to do anything other than change the oil and thats a once in a lifetime occurrence
The Fox body D'shafts fit the Comet/Mavs too. I'm running a 2004 D'shaft in mine that I bought new (left over production from Ford) Only reason I switched was both the shafts that came with my car had off center yokes that created balance problems.
I`m going to get Denneys to make me one,my friend has their directions to send them the measurements.They are made of alum. & very strong,I`ll just be done w/ it & can go on to other things,about $300.
