Vintage Mustang Forums banner

1 - 15 of 15 Posts

·
Registered
Joined
·
6,031 Posts
Discussion Starter #1
Uh oh...

My driveshaft seems to be too long for this AOD swap. With the yoke all the way into the transmission, I cant hook it up. IF I COULD hook it up, it would pop into place and there would be NO play. Mind you that the car is up in the air right now, and installing it in that condition is GOING to break something.

So I am gonna go get the thing re-tubed. The thing was getting pretty pitted anyway. I was quoted a rough estimate of $115 for retube and rebalance. I am thinking of telling them to chop it 1.5"

What is the general rule regarding how much tranny yoke should show when it is installed? For some reason 1" comes to mind...
 

·
Registered
Joined
·
7,671 Posts
With the weight on the tires and the suspension loaded, push the yoke all the way in the transmission, pull it out 1", then measure from the center of the bearing cap to center of the bearing cap for length.
 

·
Registered
Joined
·
6,031 Posts
Discussion Starter #3
Okay. Unfortunately I dont have that luxury, as I dont fit under my car. I am going to do it geometrically :)

I know difference between loaded and unloaded height. I know driveshaft length. I SHOULD be able to figure it mathematically. I am guessing around 1.375" before any real number crunching.

And I thought I would never use that crap :)
 

·
Registered
Joined
·
14,601 Posts
Couldn't you measure the difference in the length of the old vs new trans set-up from the front of the bell back and chop the difference off of the drive shaft?

Maybe I'm over simplifying this. ::
 

·
Registered
Joined
·
7,671 Posts
Unfortunately I dont have that luxury, as I dont fit under my car.

Have a jack? Some jackstands???
 

·
Incorporated Sell Out
Joined
·
17,130 Posts
IF you jack the car up by the pumpkin the suspension is still loaded and you can get an accurate measurement for the driveshaft length you need.

You can also measure you old tranny, you new tranny, and you old drive shaft (center of the U to the center of the U) subtact teh differnece in tranny lengths from the driveshaft legth and call it done.

You can also order a nice Aluminum one from Streetor track for well under $300 IIRC
 

·
Registered
Joined
·
6,031 Posts
Discussion Starter #8
That's the thing... its different. The output shaft extends well beyond (1.5") the end of the tranny. When the yoke goes on, it fits flush with the end of the housing. It is correctly built, but I didnt take into account the shaft when I measured. No biggie... my driveshaft was on its last leg anyway.
 

·
Registered
Joined
·
6,031 Posts
Discussion Starter #9
Doesnt work... you want the load on the tires right? If its jacked up in the air, it inst on the tires.. unless (duh) you put the jackstands under the axles tubes...

*smacks forehead*
 

·
Registered
Joined
·
7,671 Posts
Sorry I posted such erroneous information.

I would imagine if I had 49 solutions, you would have 50 reasons it wouldn't work..... ;) ::
 

·
Registered
Joined
·
6,031 Posts
Discussion Starter #11
That is where I got the 1.5"

When you get down to it, the amount I "lost" in the swap was only about .25"... but I think it was WAY too tight to begin with. Everything was stock... I dont really understand WHY it was that tight, but oh well.
 

·
Gone but never forgetten
Joined
·
25,239 Posts
Which tranny did you have before? FMX? Which yoke are you using? AOD?

If you're not using the AOD yoke, that's your problem. If you did have an FMX, that also could be the problem (could because I've never had an FMX).

I didn't have to do a thing to my driveshaft on my C4, except attach the AOD yoke to it with stock '66 u-joints. And the '66 and '69 C4 driveshafts are the exact same length.
 

·
Registered
Joined
·
6,031 Posts
Discussion Starter #15
I was under the impression that the driveshafts for the C4, FMX, and Toploader were all the same (I think I had somebody check a parts book).

No nevermind. I am gonna just retube this one. I dont want to spend the days/weeks looking for a C4 chaft and finding that it is the same.
 
1 - 15 of 15 Posts
Top