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Drive Shaft Lenght #3194627 12/01/23 07:14 AM 12/01/23 07:14 AM
Joined: Apr 2003 Posts: 821 On the open road Hrtbkr OP super stock
Hrtbkr OP super stock Joined: Apr 2003 Posts: 821 On the open road	Hi I'll be replacing the 7 1/4 rear with an 8 3/4 in my '70 318 automatic (904) Barracuda soon. Does anyone know what length driveshaft I'll need? Thanks While outside on the turnpike They got this new hit tune Where thrills become as cheap as gas And gas as cheap as thrills

Re: Drive Shaft Lenght [Re: Hrtbkr] #3194638 12/01/23 09:11 AM 12/01/23 09:11 AM
Joined: Apr 2014 Posts: 623 Zombieland Car Nut mopar
Car Nut mopar Joined: Apr 2014 Posts: 623 Zombieland	It’s best to measure and have your old driveshaft cut to length or have one made.

Re: Drive Shaft Lenght [Re: Car Nut] #3194647 12/01/23 10:37 AM 12/01/23 10:37 AM
Joined: Oct 2005 Posts: 8,869 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,869 Ontario, Canada	7-1/4 diff is 10.09" from pinion to axle centerline. 8-3/4 is 12.35" . Therefore you need to shorten the driveshaft by 2.26" That is unless someone has shortened or lengthened the car, in which case you better measure it !!!

Re: Drive Shaft Lenght [Re: Car Nut] #3194655 12/01/23 10:49 AM 12/01/23 10:49 AM
Joined: Nov 2007 Posts: 21,822 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,822 Kirkland, Washington	Originally Posted by Car Nut It’s best to measure and have your old driveshaft cut to length or have one made. Yep…I would do the swap and then measure after the new rear is in place.

Re: Drive Shaft Lenght [Re: Pacnorthcuda] #3194787 12/01/23 10:39 PM 12/01/23 10:39 PM
Joined: Jan 2003 Posts: 15,347 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,347 Omaha Ne	Originally Posted by Pacnorthcuda Originally Posted by Car Nut It’s best to measure and have your old driveshaft cut to length or have one made. Yep…I would do the swap and then measure after the new rear is in place. measure twice, cut once I like Stanton's approach BUTTTTTT www.tandmautomotive-omaha.com

Re: Drive Shaft Lenght [Re: TJP] #3194845 12/02/23 09:23 AM 12/02/23 09:23 AM
Joined: Apr 2003 Posts: 821 On the open road Hrtbkr OP super stock
Hrtbkr OP super stock Joined: Apr 2003 Posts: 821 On the open road	Thanks for the replies. I have a few extra drive shafts on hand and was looking for an overall length to fit my soon to be combination. The car's going to end up with a 440/727 (and maybe a gear vendors) so, being a cheap b*stard, I'm hoping to use something in my stash. While outside on the turnpike They got this new hit tune Where thrills become as cheap as gas And gas as cheap as thrills

Re: Drive Shaft Lenght [Re: TJP] #3194884 12/02/23 01:14 PM 12/02/23 01:14 PM
Joined: Sep 2003 Posts: 19,386 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,386 north of coder	Originally Posted by TJP Originally Posted by Pacnorthcuda Originally Posted by Car Nut It’s best to measure and have your old driveshaft cut to length or have one made. Yep…I would do the swap and then measure after the new rear is in place. measure twice, cut once I like Stanton's approach BUTTTTTT i always measure three times, cut five times, and it's STILL too short..........

Re: Drive Shaft Lenght [Re: moparx] #3195030 12/02/23 11:47 PM 12/02/23 11:47 PM
Joined: Jan 2003 Posts: 15,347 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,347 Omaha Ne	Originally Posted by moparx Originally Posted by TJP Originally Posted by Pacnorthcuda Originally Posted by Car Nut It’s best to measure and have your old driveshaft cut to length or have one made. Yep…I would do the swap and then measure after the new rear is in place. measure twice, cut once I like Stanton's approach BUTTTTTT i always measure three times, cut five times, and it's STILL too short.......... That's cause you're butt cracks not showing, has to be to get an accurate measurement ask any construction guy 🤣🤣 www.tandmautomotive-omaha.com

Re: Drive Shaft Lenght [Re: TJP] #3195036 12/03/23 03:11 AM 12/03/23 03:11 AM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	I like to shove the tranny yoke in all the way and then slide it out 3/4 inch,.750, and use that for the center to center of the u joint distances that is with all the weight of the vehicle on the tires on the ground or something acting as the ground like jack stand under the rear end housing and front lower control arms Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Drive Shaft Lenght [Re: Cab_Burge] #3195082 12/03/23 11:34 AM 12/03/23 11:34 AM
Joined: Jan 2003 Posts: 20,762 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,762 A collage of whims	What Cab says. Most engagement of the output shaft you can get without bottoming. With the way tolerances stack up, especially on a build-up of an old car, driveshaft's one of the last things to do.

Re: Drive Shaft Lenght [Re: Cab_Burge] #3195123 12/03/23 02:55 PM 12/03/23 02:55 PM
Joined: Jan 2003 Posts: 15,347 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,347 Omaha Ne	Originally Posted by Cab_Burge I like to shove the tranny yoke in all the way and then slide it out 3/4 inch,.750, and use that for the center to center of the u joint distances that is with all the weight of the vehicle on the tires on the ground or something acting as the ground like jack stand under the rear end housing and front lower control arms 100% www.tandmautomotive-omaha.com

Re: Drive Shaft Lenght [Re: TJP] #3195136 12/03/23 03:28 PM 12/03/23 03:28 PM
Joined: Sep 2003 Posts: 19,386 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,386 north of coder	Originally Posted by TJP Originally Posted by Cab_Burge I like to shove the tranny yoke in all the way and then slide it out 3/4 inch,.750, and use that for the center to center of the u joint distances that is with all the weight of the vehicle on the tires on the ground or something acting as the ground like jack stand under the rear end housing and front lower control arms 100% absolutely the correct way.

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