AOD Lock Up Converter? (WAS: Re: 351w w/c-6 or 300 w/c-6)

j41385 · Post by **j41385** » Wed Oct 22, 2008 10:53 pm

TOPIC HAS BEEN SPLIT

The non Computerised AOD was made from 1980-1993. It never had a lock up converter, it locks up in the case. When the 2 piece input shaft is in lock up mode, which is 60% in 3rd, and 100% lock up in 4th it bypasses the converter by that percent. The weak point is the small input shaft. Companies make harder small input shafts, but say that they are for severe duty applications over 350hp.

willowbilly3 · Post by **willowbilly3** » Thu Oct 23, 2008 3:40 am

Hmm, I guess the article I read in HotRod was erroneous, they said the AOD had a lock up converter.

j41385 · Post by **j41385** » Thu Oct 23, 2008 5:37 am

Read about it here, http://www.baumannengineering.com/aodefund.htm

As they state, the lockup in the AOD-E is Different from the AOD thusly..."Another feature that is greatly improved from the AOD is the "lockup" or torque converter bypass system. Instead of the weaker concentric input shaft system of the AOD, the AOD-E/4R70W uses an actual clutch in the converter to provide lockup under EEC control, rather than the fixed "60% lockup" in third and "full lockup" in fourth gear system of the AOD."

Post by **DuckRyder** » Thu Oct 23, 2008 7:13 am

j41385 wrote:Read about it here, http://www.baumannengineering.com/aodefund.htm

As they state, the lockup in the AOD-E is Different from the AOD thusly..."Another feature that is greatly improved from the AOD is the "lockup" or torque converter bypass system. Instead of the weaker concentric input shaft system of the AOD, the AOD-E/4R70W uses an actual clutch in the converter to provide lockup under EEC control, rather than the fixed "60% lockup" in third and "full lockup" in fourth gear system of the AOD."

It seems clear from the rest of that paragraph tha the standard AOD does in fact have a lockup converter.

j41385 · Post by **j41385** » Thu Oct 23, 2008 5:51 pm

Sort of. All that means is the back of the torq converter to works with the dual input shaft system so it can be by passed in lock up mode. All I am saying is there are no lock up clutches in the converter like newer transmissions.

Jake11 · Post by **Jake11** » Fri Oct 24, 2008 2:09 am

The "AOD" has a 5/16" shaft like the oil pump drive in a Ford motor that splines into the converter housing and the
rear planet. In 4th it carries all the engine power. Too much torque and strippo-matic. Yeah, it ain't a lock up.
They work fine with small blocks. Know a guy that's got one for sale. Pro built. Jake

Post by **DuckRyder** » Fri Oct 24, 2008 8:04 am

O.K. Lets step back a minute and clarify:

Torque converters are sold in both lock up and non-lock up versions for AOD's. Therefore, one must draw the conclusion that an AOD does in fact lock up and that the torque converter has something to do with it.

I do gather that the manner in which it locks up has something to do with the input shaft as well, and is not the typical fiber clutch in the converter as in more modern transmissions.

I have not been able to find anything that explains the system.

So, my question is this:

Can anyone explain exactly how the system in the AOD obtains "70% lock up in third and 100% lockup in forth"?