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Old 11-02-2008, 10:05 PM
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Jake's AOD :D

I recently did an AOD trans for my Dad's '66 Mustang.
It has worked pretty good overall. Lots of internal upgrades, Lentech VB with electric OD feature, diode sprag, wide band, A servo, etc.

However the 1-2 shift at WOT has been harder than I normally build into a trans because I didn't do the VB mods and I'm pretty new to the AOD.

I picked up the car today to bring it over to the shop to do some exhaust work and diagnose a 2nd gear takeoff issue with the trans (governor problem).

I saved myself the time of having to remove the driveshaft the normal way




Oops! new u-joints (albeit small ones) freshly balanced driveshaft, etc but a few WOT 1-2's did this one in.

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Old 11-03-2008, 08:54 AM
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Quote:
I saved myself the time of having to remove the driveshaft the normal way
Whoa. I guess you did...

That U-joint just snapped clean off! Please tell us the brand/series of that u-joint. I do not want to lose a d-shaft again. I had a similar failure a few years back. I cringe every time I think about it.

You may consider some non-greasable joints for the next try. They aren't hollow.
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Old 11-03-2008, 01:39 PM
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The car will go back together with larger joints. There were two different size on the '66 Fords and this car had the little ones.

Ther joint was either a Spicer or Neapco, my local driveshaft shop uses both depending on availability,

I'm not sure the non-greasable joints are available in the smaller size.

Part of the problem is the AOD just shifts too hard to 2nd. It's a Lentech VB and I put the 4R70W drum with diode sprag, 4 clutch int pack, larger OD servo, wide OD band, Alto Red direct clutches, etc. Nice little AOD for my first AOD build. Very happy with it except the Lentech VB just shifts to hard at WOT to 2nd.
My Dad did a WOT run a couple of days ago and he said it wheelhopped twice on the 1-2 shift on his run and he suspects he may have injured the joint and I finished it off.
Notice the cut brake line...
It took that out when it came loose also. I immediately let off, shifted to neutral and hit the brakes, but no brakes.
So I grabbed the e-brake and used it to stop the car. Interesting ride.
I was too busy to look over and see what my 8 yr old son was thinking about all the commotion
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Old 11-03-2008, 04:38 PM
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Yeah I saw the brake line... Yeaaa. And right beside it, a fuel line?

Had it all under control huh?

What's the practical limit for the center direct shaft? (3&4) Are you pushing big power in the Mustang?

I wish Ford had a non-electric 4R70w. Any AOD I heard of is a little weak in the knees. Sounds like you used some good parts in your Dad's though.
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Old 11-03-2008, 04:58 PM
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I used the good parts from the 4R70W.

In all reality, knowing what I know now I would probably build a 4R70 and use the Bauman controller.
The 4R70W is cheaper to build stronger because it already has the good drum, servo, band, etc, just needs minor mods for the valve body and a controller.

By the time you spend the $$ on a good VB for the AOD, you are near the price of a controller, not counting the cost of the 4R70 parts.

However the AOD with a non-lockup converter ties the inptu shafts together ( as I understand it) and it takes some of the load off the inner shaft so you can put more power through it.
I'm borderline at about 400-450 hp at the motor on this thing.
I built a 347 stroker for it and the AOD, 3.89 gears in an 8" with posi that I got from Quick Performance, and it's getting a 3" exhaust today as well as a new driveshaft, pinion yoke, slip yoke tomorrow

It's pretty zippy. The last time I drove it it still had a 2.80 non-posi in it and you could run it in 1st all the way up the entrance ramp I broke it on. Yesterday I broke it and coasted to the end of the ramp. It goes through 1st much quicker
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