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Drive shaft help!

Moderator: Mod Squad

anotherhassel
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Posts: 137
Joined: Sun Dec 30, 2007 12:11 pm

Drive shaft help!

Post #1 by anotherhassel » Thu Mar 21, 2019 7:06 pm

Guys I’m going to get another driveshaft for my 68 mustang t5 swap. I need to know if a bent 8 shaft will work? The driveshaft in the car now is from when it was the automatic if that helps. I thought the c4 6 cylinder cars had the same shaft as the 8 so....

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62Cometman
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Joined: Sun Mar 22, 2015 2:41 pm
Location: Lincoln, NE

Re: Drive shaft help!

Post #2 by 62Cometman » Fri Mar 22, 2019 12:52 pm

I dont believe so, purely off the fact that the 6 cyl c4s and the 8 cyl c4s are completely different even in length, so i beleive your problem will be 2 fold it will be too short and the slip yoke wont have the right spline count on it. If you need yours shortened it might just be worth while to see what a shop would charge to do so, if all they are doing is cutting and balancing they might not be too bad. Good luck with your search :beer:
1962 Mercury Comet 170 ci, Dagenham Trans, 2.83:1 7.25 rear.
She ain't fast but she's fun. 8)

anotherhassel
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Joined: Sun Dec 30, 2007 12:11 pm

Re: Drive shaft help!

Post #3 by anotherhassel » Fri Mar 22, 2019 3:04 pm

I know they need to be shortened. I was hoping they were the same diameter and used the same joints.

mustang6
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Location: near Tacoma, WA USA

Re: Drive shaft help!

Post #4 by mustang6 » Sun Mar 24, 2019 2:46 am

Six cylinder automatic driveshafts are the same as V8 automatics in the early Mustangs. On manual transmissions, the V8s use the larger driveshafts and ujoints (1310 outside snap rings) like the automatics, but the manual sixes got the puny ones (1110 inside snap rings). But like the others said, if you have yours worked you don't need to worry.

Also, before you go running to get your driveshaft shortened, put the T-5 together and try it. It may depend on which adapter and crossmember version you are using, but some guys find the driveshaft works with no mods (I did). If you are using the C4 driveshaft you will need to put the T5 yoke on it though.
Scott

68 Mustang 200 ci, Aussie 250-2V head, Dual Headers, Comp Cams 252H, DSII w/MSD 6AL, T-5, V8 suspension.

65 Ranchero 200 ci, late 170 head, Autolite 1101, 3.03 3 speed, Maverick 8" 4 lug rear with 3.55 gears.

anotherhassel
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Joined: Sun Dec 30, 2007 12:11 pm

Re: Drive shaft help!

Post #5 by anotherhassel » Mon Mar 25, 2019 5:36 pm

62Cometman wrote:I dont believe so, purely off the fact that the 6 cyl c4s and the 8 cyl c4s are completely different even in length, so i beleive your problem will be 2 fold it will be too short and the slip yoke wont have the right spline count on it. If you need yours shortened it might just be worth while to see what a shop would charge to do so, if all they are doing is cutting and balancing they might not be too bad. Good luck with your search :beer:



Thanks for the help I won’t do anything till the new trans is in place. Why doesn’t the c4 yoke work? Aren’t they both 28 spline?

mustang6
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Re: Drive shaft help!

Post #6 by mustang6 » Tue Mar 26, 2019 2:19 am

Yes, they are both 28 spline but the c-4 yoke is longer, I think to better reach the inner support bushing on the c4. The manual transmissions aren't supported the same way so the yoke is shorter. Maybe this has something to do with whether you end up having to shorten the driveline or not, the c4 yoke might bottom out before it's all the way in and the t5 yoke maybe gives you a little more room (I used a new T5 yoke).

Once again, you should get it all together and try it. The c4 yoke will slide in, so see if it works and if you find it doesn't go in quite far enough you can either shorten the driveline or get a T5 yoke. I've also heard that people have cut the c4 yokes to use in the t5 so that's an option.

Image
Scott

68 Mustang 200 ci, Aussie 250-2V head, Dual Headers, Comp Cams 252H, DSII w/MSD 6AL, T-5, V8 suspension.

65 Ranchero 200 ci, late 170 head, Autolite 1101, 3.03 3 speed, Maverick 8" 4 lug rear with 3.55 gears.

anotherhassel
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Posts: 137
Joined: Sun Dec 30, 2007 12:11 pm

Re: Drive shaft help!

Post #7 by anotherhassel » Wed Mar 27, 2019 6:00 pm

For what a new yoke cost I’m just gonna get one. If I can keep the shaft that’s a huge bonus.

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