drive shaft issues
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Cross-Country
Joined: Jan 2007
Posts: 58
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drive shaft issues
I would have posted on my last thread but I can't find it. Anyways, I bought a 1985 Lincoln Town Car, 302 FI, AOD auto. I pulled the motor and trans and sold the car. Now, I had mentioned putting the motor and the overdrive trans into my 74 F100 (302, c4, 2wd). Two questions about the trans. A few people on here mentioned I would probably need to shorten the drive shaft and move the cross member back a bit. I have a two piece drive shaft so I am not sure how I would do that. Also, the AOD has a electrical connector right next to the shift linkage, does anyone know what that controls and if it is neccesary. Thanks for your help.
Posting Guru
Joined: Jul 2009
Posts: 1,536
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From: Schweinfurt Germany
Well for the drive shaft it would be a bit easier for you to find a new solid driveshaft the right length many race shops can find the right one for you especially with the home build hot rods now.
Laughing Gas
Joined: Jun 2007
Posts: 811
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A drive shaft shop can either shorten your shaft or build a custom shaft for you relatively cheaply. I had a custom shaft build out of steel for my truck that is lighter and stronger than the shaft that was originally in the truck. They can also put custom yokes in that will allow you to mate up the u joints if they are of different sizes. Then they'll balance the whole thing. You need to have your motor, trans and rear end installed, and follow their directions for measurements.
Senior User
Joined: May 2009
Posts: 347
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From: Skyway, WA
The first time I swapped engine/transmission in my 76 F100 2wd, I had to both shorten the two piece driveline and move the tranmission crossmember. Neither was a big deal. I towed the truck to a driveline shop which did measurements, shortened the first half of the driveline, and balanced it. I could have made careful measurements myself and saved the tow. As far as the crossmember, it rests onto the bottom of the frame rails. You can unbolt it, attach your transmission to it, and let it sits where it sits. Then drill new holes in the frame.
Senior User
Joined: May 2009
Posts: 347
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From: Skyway, WA
I'm not an expert, but my understanding from reading all the Mustang magazines a few years back, was that the AOD isn't electronically controlled. The EAOD is. My guess is that that wiring you see may be a neutral safety switch. The dent side trucks utilize a neutral safety switch on the base of the steering column. If this is correct, you won't need that switch (if it really is a neutral safety switch) on the side of the transmission. Alot of Mustang folks modernize their older 'stangs with newer drivetrains. There should be able to get the info from the later model forums, or a good Mustang forum.
Elder User
Joined: Mar 2006
Posts: 670
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From: Western, PA
You can shorten the driveshaft by yourself. Just grind the weld off holding the yoke in then it should just slide out of the shaft. Then cut the shaft to the length you need and weld the yoke back in.
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