I found an AOD trans from a 90 bronco 4x4. Other than having to hook up a throttle valve cable to the carburetor, what other 'conversions' or parts do I need to do to fit this in place of my c6? Do I need to change the trans cross member? shorten the driveshaft? I currently have a 4x4 setup so bolting a 4x4 trans into an existing 4x4 shouldn't be too much of an issue should it? Any other things I should know about before I get myself into a "project". Do I need to change the flexplate? cooler line locations, etc? My only concern is really the cross member, driveshaft and t/v cable which it comes with.

Thanks for the input.

 

Al, I can help you a bit; at one stage I swapped an AOD out of my truck & replaced it with a C6.........

The cross member was fine for me, but there are extra holes in both the cross member (where the trans rear mount bolts down) & in the frame rails; the cross member is also reversible in the frame.

I had to shorten my drive shaft slightly.
But C6's don't all have the same length tailshaft, so you might or might not, have to modify your driveshaft for the AOD.
Also, my truck is a 2WD.

AFAIK any stock transfer case will bolt up to any stock 4x4 trans.

Flexplates can be an issue - a C6 can use an original AOD plate; but an AOD can NOT use an original C6 plate......major damage will result.
Some aftermarket flexplates plates are advertised as dual-use, but I've had no experience with them.
Also, check that the flexplate you use has the correct balance for your motor - most differ, & 302's changed from 28oz to 50oz in 1981.

In my case the original (1983) AOD cooler lines had the same fittings as the C6 trans.
The front line screwed straight in; the rear line had to be shortened or lengthened slightly, I forget which - but your later AOD has different port positions, so you may need extra modifying.

The TV cable needs to be set correctly (important), & to do that a pressure gauge has to be plumbed into the transmission while the adjustments are set.
There are alternative methods to set it without a gauge, but from personal experience, I would say don't take any shortcuts with AOD's.
You'll have to make some provision at the carb to hook up the cable.

Some time around the year of your AOD, speedo cables were no longer installed into the transmission like the earlier trucks.......so that might be an issue.

One adaption I had to do was to shorten the selector lever on the side of the C6 trans, to match the length of the AOD one........something to check, or your shifter & indicator won't travel the right distance.

 

Thanks Ken! Very Much appreciated. I am keeping a log of these type of "notes" so when I get the trans or if I find a truck in the junkyard with an AOD I can scavenge the parts for when I'm ready. I was a bit worried about the bellcranks (shift levers) being an issue. Had the same issue when I swapped out a GM metric crap trans for a beefy th-350. The bell cranks were different but by the graces of god a good internet friend had an extra and sold it to me.

Just for the record for anyone else reading this (and I may be incorrect here but I'm certain i'm not) the T/V cable adjustment is way more simple than you'd like. I had done a few years back in my Oldsmobile days as they had the same setup. I also found a pretty good youtube video with a mechanic showing how they're "adjusted". The simplest explanation is that the cable wants to neither have slack or tension when it's at 'rest'. See the vid. I guess the pressure gauge could be a better method but I haven't the slightest idea of what I'd be doing. I will however do a little more research on that too. Can't hurt to know some more "useless" information

Thanks,

 

This might help, Al.


Baumann Electronic Controls

 

Ken, good idea, but AODs are pure mechanical, TV cable and governor. It wasn't until the AOD-E that the small transmission became electronic.

As far as adjusting the TV cable, if you start with a little tight, the shifts will be late and hard, but it won't burn up. Correct adjustment will be a firm shift and OD will engage around 40 mph. Best source for a TV cable setup would be Lokar, they have a lot of that sort of stuff.

Ken is correct on the transfer case, bigger issue might be any difference in overall length of the AOD vs C6. A small difference the driveline parts can probably handle.

 

I think that particular page just relates to the conventional AOD.