| #1 darkblade101 | What length driveshaft for 302/c4 77 mav | ||
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I have a 77 2 door 302/c4 i bought to restore,it has had a vibration when you accelerate ever since then.I was changing the u joints hoping that was the problem when i put the front yolk in all the way i had to pull it out a bunch before it reached the rear end.I grabbed the front yolk and i can move it up and down quite a bit and it seems there isnt much of the yolk in the back of transmission.Theres atleast 3 inches or more it could go in the transmission. Nothing on this car is original , the guy i bought it from used parts from any vehicle he could, to make it run.The driveshaft in it is small arround , i used to have a 73 2 door 302/c4 and its driveshaft was bigger and had a different front yolk on it, this one has a round balancer on the front the 73 didnt. The driveshaft measures 45 1/2 from center u joint cap to center u joint cap , the yolk is 6 5/8 from center u joint cap to end , 28 spline. I am not sure on the driveshafts diameter but i am guessing the smallest one for ford because it is very small. I have a 71 2 door 6/3 speed manual parts car i am going to check the length of the driveshaft and the length of the yolk and spline.I am really thinking this is my vibration when accelerating , it stops when i let off.But any advice would be great thanks. jpalmer26@cox.net  jpalmer26@cox.net |
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| #2 Fro | Re:What length driveshaft for 302/c4 77 mav | ||
| I fought the same problem for years, what you need is from bottomed out at your yoke to where it seats on your U joints is between 1 1/4"- 1 1/2" also you might want to change your tailshaft bushing and measure your yoke to make sure its not wore to much, I ended up running a FOX Mustang drive shaft which helped a whole lot then I bought a Ford Racing aluminum shaft and vibrations are a thing of the past, Good luck with it. | |||
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| #3 Grabber5.0 | Re: What length driveshaft for 302/c4 77 mav | ||
| Jeff, can you explain that again for the dense? (i.e. me) Because I just didn't understand it. :-) | |||
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| #4 Grabber5.0 | Re: What length driveshaft for 302/c4 77 mav | ||
| One of these days I really need to install the "new" (has a few passes on it) I bought from Stephen Moore. :D | |||
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| #5 darkblade101 | Re:What length driveshaft for 302/c4 77 mav | ||
| Thanks , i knew that the yolk should be just barely out of the transmision not 3-4 inches , i will take your advice on the 1 1/2 inch thats what i thought.i will check on a foxbody driveshaft ,thanks . | |||
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| #6 Fro | Re: What length driveshaft for 302/c4 77 mav | ||
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Originally posted by Grabber5.0 Jeff, can you explain that again for the dense? (i.e. me) Because I just didn't understand it. :-) You know, when you slip your driveshaft yoke into the transmission as far as it will go and then you slide it back to put your u joint cups to the rear end, that distance between fully forward and rear u joint installed should be around 1 1/4 - 1 1/2 inches, that allows enough clearance for things to move around especially on a leaf spring car, cars like FOX mustangs dont need as much clearance because they are control armed and dont move around as much. |
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| #7 Fro | Re:What length driveshaft for 302/c4 77 mav | ||
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Originally posted by darkblade101 Thanks , i knew that the yolk should be just barely out of the transmision not 3-4 inches , i will take your advice on the 1 1/2 inch thats what i thought.i will check on a foxbody driveshaft ,thanks . Your welcome, Ive heard several people say that the FOX shafts were to short for they're cars, I'd measure carefully, honestly I think it has more to do with the diameter than anything, the FOX shafts are much larger, I'm also running a 9 inch rear which has a slightly longer pinion yoke but I dont think its more than 1/4" longer. |
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| #8 Grabber5.0 | Re: What length driveshaft for 302/c4 77 mav | ||
| Okay... That's what I was thinking, but couldn't get it out in writing, so I just left the question. :D. Thanks Jeff. | |||
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| #9 Fro | Re: What length driveshaft for 302/c4 77 mav | ||
| No problem buddy, Im not very good at explaining, ask my wife... | |||
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