70 Mach 351C AOD conversion driveshaft length?

[miketyler 15]

Am fitting my driveshaft now and it looks like the stock shaft may work with no length mods. However judging from the wear pattern on the AOD yoke looks like it may be in farther than it was originally. How can I tell for certain?

 

I know during operation the distance from the tailshaft to the yoke can vary and there needs to be proper allowance for thrust travel. Car is a 351C Mach with 9" rear end and 2" dearched springs.

[LindenBruce 27]

Did you have an FMX or C4 originally? Depending on the tail shaft length of the AOD you are using, there are two different lengths, you may be just fine or you may have to cut an inch off of your drive line. Make sure the yoke is clean inside and out. Then install it and see how she fits. If the drive line slides in far enough to easily bolt in the rear u-joint you will be just fine. Bruce

[miketyler 15]

Hi Bruce - thanks for responding. Car was an origianl FMX car. I just went out and bought new U-joints so will see how easy it is to put driveshaft back in. Obviously if it bottoms out at the trans end I will have some work to do. :0)

Was odd that they had two different size UJoints for a 351C, one 3.2" and one 3.6". Maybe one was for the 9" rear end cars? I got the 3.6", will see if they fit.

[LindenBruce 27]

Ok, your FMX yoke won't work. It's to big in diameter. You will need a c4-c5-aod yoke. Bruce

[miketyler 15]

yes, I got the AOD yoke with the AOD from the donor car among other parts. Also, I guess I had a 50/50 shot on the u-joints. Mine measure the smaller size 3.2".

Edited January 23, 2012 by miketyler

[buening 63]

You'll want 0.75-1.25" of yoke pulled out from bottoming out on the trans, for suspension travel. What are you getting right now?

[miketyler 15]

probably have an inch, am exchanging the Ujoints this afternoon. Will assemble and measure the distance

[buening 63]

A little tidbit from SoT regarding measuring for a driveshaft: http://www.streetortrack.com/Custom-length-aluminum-driveshaft-pr-16159.html

[miketyler 15]

Got the smaller u-joints but had no time to install. I held the driveshaft in place and measured about 3/4" before the yoke bottomed out. According to the SorT article I am probably at the minimum.

[buening 63]

You should be good to go then with the 3/4"! Too cool that the stock driveshaft worked out, but then again I'm not surprised considering the AOD was actually designed from an FMX ;)

 

Some good info: http://www.baumannengineering.com/aodefund.htm

http://www.rodandcustommagazine.com/techarticles/0911rc_ford_automatic_transmission/viewall.html