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A-body four speed driveshaft length?? #201668 01/23/09 01:01 AM 01/23/09 01:01 AM
Joined: Jan 2003 Posts: 8,144 Arkansas 340727dart OP master
340727dart OP master Joined: Jan 2003 Posts: 8,144 Arkansas	I got my new four speed bolted up tonight. I know I need to either lengthen the drive shaft previously used with the 727, or just get a new one made. But, I need to know just how much to have added. How much free movement back and forth should there be with the drive shaft yoke on the tail shaft of the transmission? Thanks. Your life is not my fault. My life is none of your business. Speech is free only if you agree with those in control.

Re: A-body four speed driveshaft length?? [Re: 340727dart] #201669 01/23/09 07:29 AM 01/23/09 07:29 AM
Joined: Aug 2006 Posts: 1,349 warfordsburg, PA dirt pro stock
dirt pro stock Joined: Aug 2006 Posts: 1,349 warfordsburg, PA	i think its around 51 1/4 but i will have to measure, i am working on a 68 dart today with a 4 speed so i could check it out for you. i will measure it and check back here later this evening if no one has answered for sure i will post it.

Re: A-body four speed driveshaft length?? [Re: 340727dart] #201670 01/23/09 09:23 AM 01/23/09 09:23 AM
Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN R Rug_Trucker I Live Here
Rug_Trucker I Live Here R Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN	I could measure mine except I have a 7 1/4. I am sure the nose on that is different than the 8 3/4. "The only thing to do for triumph of evil is for good men to do nothing" "NUNQUAM NON PARATUS!"

Re: A-body four speed driveshaft length?? [Re: 340727dart] #201671 01/23/09 11:39 AM 01/23/09 11:39 AM
Joined: Jan 2003 Posts: 8,144 Arkansas 340727dart OP master
340727dart OP master Joined: Jan 2003 Posts: 8,144 Arkansas	I guess what I need to know is how far the drive shaft yoke should extend into the transmission. How much movement back and forth do I need to compensate for suspension movement so that the yoke doesn't bottom out on the transmission's output shaft and to prevent it from pulling out of the transmission? Your life is not my fault. My life is none of your business. Speech is free only if you agree with those in control.

Re: A-body four speed driveshaft length?? [Re: 340727dart] #201672 01/23/09 11:50 AM 01/23/09 11:50 AM
Joined: Jan 2003 Posts: 4,573 ...gently down the stream LAR_414 master
LAR_414 master Joined: Jan 2003 Posts: 4,573 ...gently down the stream	Put yoke in trans,....pull out 3/4" and make sure if you have a "boot" it is riding on the machined surface. Everything at ride hight, and measure center of ujoint to center of ujoint. It's the only way to get it right! Do it this way!

Re: A-body four speed driveshaft length?? [Re: LAR_414] #201673 01/23/09 11:56 AM 01/23/09 11:56 AM
Joined: Jan 2003 Posts: 8,144 Arkansas 340727dart OP master
340727dart OP master Joined: Jan 2003 Posts: 8,144 Arkansas	Quote: Put yoke in trans,....pull out 3/4" and make sure if you have a "boot" it is riding on the machined surface. Everything at ride hight, and measure center of ujoint to center of ujoint. It's the only way to get it right! Do it this way! 3/4" is all I need to pull it out? What is the boot you are referring to? Thanks. Your life is not my fault. My life is none of your business. Speech is free only if you agree with those in control.

Re: A-body four speed driveshaft length?? [Re: 340727dart] #201674 01/23/09 12:15 PM 01/23/09 12:15 PM
Joined: Jan 2003 Posts: 4,573 ...gently down the stream LAR_414 master
LAR_414 master Joined: Jan 2003 Posts: 4,573 ...gently down the stream	3/4" is all it needs to be out! Two types of rear seals in transmissions were used. Both have the normal lip seal to seal out the trans fluid. One has an ADDITIONAL "boot" to seal out dirt and stuff. The Boot makes the overall lenght of the seal much longer. It doesn't really seal anything, but protects the real seal from dirt and moisture.

Re: A-body four speed driveshaft length?? [Re: LAR_414] #201675 01/23/09 12:17 PM 01/23/09 12:17 PM
Joined: Jan 2003 Posts: 8,144 Arkansas 340727dart OP master
340727dart OP master Joined: Jan 2003 Posts: 8,144 Arkansas	Quote: 3/4" is all it needs to be out! Two types of rear seals in transmissions were used. Both have the normal lip seal to seal out the trans fluid. One has an ADDITIONAL "boot" to seal out dirt and stuff. The Boot makes the overall lenght of the seal much longer. It doesn't really seal anything, but protects the real seal from dirt and moisture. OK. Gotcha. I just bought a rear seal that has that additional boot on it. Thanks again. Your life is not my fault. My life is none of your business. Speech is free only if you agree with those in control.

Re: A-body four speed driveshaft length?? [Re: 340727dart] #201676 01/24/09 01:08 AM 01/24/09 01:08 AM
Joined: Jan 2003 Posts: 5,270 Missouri M MY340 master
MY340 master M Joined: Jan 2003 Posts: 5,270 Missouri	TK, I'd get a new heavy duty driveshaft made if I were you. A shop in Arnold, MO did a 3" custom one for me with solid race u-joints and it was much stouter than the original. If I remember correctly it cost me around $250. You have around a 400hp 340-4spd now twisting on that factory driveshaft. You don't want to spit that driveshaft out from under the car on a burnout or 6000rpm shift. 1970 FE5 Duster 360/904/3.91's SOLD 1973 TB3 SpaceDuster 340/4spd/4.10's SOLD Moparless for now but when the opportunity is right I'll have another one.

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