OK. The saga goes. I need to know if my 86 Bronco AOD has a vaccum modulator? I have been rebuilding the motor went to test drive it and it would not shift gears. Any suggestions?

 

it should be cable controled, and if its not hooked up or set right it will burn up the trany very quickly from what i've been told, although i cant tell you how you what to do to it cuz i've never done it. hopefuly someone will jump in here that knows a little more about it, good luck DW

 

Again the Saga. I got this '86 Bronco from this guy who converted it from fuel injection to carb. He tore out all the emissions and was using a Eldebrock manifold and carb, which could use a the cable kickdown. But he had removed those parts to sell it to me. I went to a bone yard and found a kickdown bar from an '83 e150 with an AOD. I figured it would work because they were both AOD transmissions. What I don't get is that I always though the kickdown was only for kicking the transmission into a passing gear; nothing else.

I could really use the help guys on this. The family and I are down to one vehicle and it is making life hard for us. Any and all help is greatly appreciated.

 

I think the kickdown controls all the shift points to some extent. If yours is telling the tranny that the pedal is floored, it probably won't upshift at all. I'd try disconnecting the kickdown and see if it shifts then. Also, since the engine has been out, make sure the tranny linkage is doing what the quadrant says. Does neutral mean neutral, and reverse reverse?

 

that cable controls the shifting on a AOD, but i do know that everyone ive talked to says it will FRY a AOD if its not hooked up correctly. DW

 

Then how come I have seen an '84 AOD on a Ford Van and it had a bar kickdown, which is what I have now?

I am going to try disconnecting the kickdown and see the transmission will shift out of first. It does go into reverse and drive with no problems. If not I am gload I still have my C-6 from my other Bronco, which I had to retire because I fell through the drivers side because of rust. That was a real funny sight to see.

Thanks

 

On an AOD the mechanical linkage from the throttle on your FI (or carb) is connected to a throttle valve in the transmission. It adjusts line pressure inside the trans to allow it to work properly - If it is not connected, just a few miles driving will allow so much slippage that the clutch sets will be toasted. There is no vaccuum modulator on the AOD. Furthermore, pre '88 models were not very tolerant of high mileage or abuse, so it won't take much to turn it into a "boat anchor" Be very careful with experimentation.

 

yeh, What he said! DW

 

If you got a pre 88 AOD, I'd definately put that C6 in there.

 

im with rlh , just because if what your experiencing with the tranny. this might silly of me to ask but is the tranny full of fluid?

good luck

 

Dear Kemicalburns;

Yes. There is plenty of fluids in the transmission. That was the first thing I checked. No... That wasn't a sily question either, because I am sure that is the most often over looked item.

Thanks.

I will be working of the beat this weekend so wish me luck. I will update again afterwards.

 

You can find earlier 80's trucks (like my 82) with a "bar" that controls the TV instead of the cable found on all EFI vehicles. Although it looks like the kickdown rod it's adjustment is absolutely critical to the operation of the AOD. It must be adjusted correctly or else. Just like the TV (throttle valve) cable. I have seen AOD's "burned up" in a couple of miles just because of TV maladjustment. It's not uncommon to also lose The OD gear though the other 3 gears still work. My TV broke on the freeway once and I lost OD and never got it back. I was able to drive the truck as a 3 speed until I got around to fixing it though.
Though less important, the TV does also control the kickdown function too.
The rod is tough to get right from scratch. The cable is easier, you can set it where the cable's tension just barely pulls it out of the cable cover at the throttle end. This is usually close enough for to do a short test run, return and readjust. Tiny adjustments can make a suprising difference in shifts. You want somewhere in between harsh, sudden shifts and gears that take too long to change. Err a bit on the side of harsh if you can, excessively slow and "soft" shifts are known to burn up the clutches in any automatic transmission.

 

If the AOD has a TV cable you can adjust it by following the instructions here http://www.tccoa.com/articles/tranny...st/index.shtml

 

OK. The AOD trans was completely burned out, so I installed the C6 from my retired Bronco. It is now running fine even with the EEC-IV ignition with no sensors; go figure that out. The next step is to fix the gas gauge and the speedo.

I would like thank all of you for your help. Anything else I should probably check into for my rig?

 

Goin through the same tranny issues right now... Converted from EFI to carb ..mallory unilite ign....on my 90 XLT
Of course had all of the normal probs ..all fixed but trans ..thnx for the link..it explained what i needed (I hope)

Will try it out this weekend

Next step is conversion to manual anyway but gotta drive this one as is for now


spike