so i just got a AOD from a Crow Vic i forgot the year & it's going in my F150 which converter should i get lock up or non-lock up? i just want a slightly bigger than stock stall also. it's a daily driver no towing just minor dirt hauling and stuff from lowes or home depot...

 

The AOD is unique in that the transmission is actually direct drive from the torque converter shell to the overdrive unit. What makes this different from most automatic overdrives is that lockup takes place inside the overdrive unit instead of the torque converter by a special inner input shaft. This feature offers non-slip direct drive in Overdrive and partuially in third gear as well. Do a gentle throttle tip-in and get both slippage and torque multiplication in third and fourth gears. Relax the throttle to get overdrive lockup and fuel-efficient direct drive between torque converter shell and output shaft. This is known as “split-torque.” It occurs when the transmission comes out of overdrive lockup during throttle tip-in for mild acceleration where you are on the torque converter getting torque multiplication. With torque multiplication, you get 2 to 21⁄2 times your engine’s torque.

For efficiency and gas mileage, the stock style lockup type converter is what you want. The non locking converter is better for racing, but gas mileage will suffer and it will generate a lot of heat.

Why do you want a bigger stall? The stock stall speed is around 1800. I wouldn't go much more than 500 RPM above that, unless you are spending a lot of time at the racetrack.

Are you running a carburetor? If you are, read this VERY IMPORTANT link first:

https://www.ford-trucks.com/forums/1...th-an-aod.html

 

Lariat 85 thanks for the tip but the reason for the bigger stall is that the engine isn't stock it has a mild cam in it. i saw one with a 2000 stall speed so that's what i was looking for. the truck will spend more time on the street than on a track so the lock up is the route I'll be going because i want that gas mileage since it's has a 625 street demon on it i've already called Lokar and got the part numbers that i need to get everything going i just needed to know which torque converter to get.

 

B&M Tork Master Torque Converters 40437 this is the one that im looking at from summit it has a 2000 stall

 

People seem to talk about being able to use a lockup or non-lockup torque converter in an AOD, so maybe my info is bad. But when I had an AOD built for me Bronco, I was told that going to a non-lockup converter required replacing the input shaft, which required pretty much a complete tear-down of the trans. If that's true I'd REALLY suggest going with a lockup unless someone wants a lot of expense to get worse mileage, and a lot of expense to change it back when they decide it was a mistake (not that it's a factor for you since you said you're going with lockup now).

 

Hold on there, Chief. I just looked up the 625 Street Demon, and Holley plainly states: "Linkage will not work with Ford AOD transmissions." Do not connect the Lokar TV cable to the Ford kick-down linkage! The Ford kick-down linkage is used for the kick-down rod on the Ford C4 and C6 transmissions ONLY. Connecting the Lokar TV cable to the stud meant for GM 200R4/700R4 transmission *might* work with an AOD, but I don't know for sure. Looking at my own carburetor and Lokar TV cable, I don't think it will. If it doesn't, you will find out very quickly. Then you are going to have to use a geometry corrector bracket on the carburetor. I don't think there is a geometry corrector bracket available for the 625 street demon, so be prepared to make one.

Everything you were told is true.

A Non-lockup converter *can* be done on an AOD, and it works well on the track, but I wouldn't do it on a truck or a street vehicle for all the reasons you mentioned.