Too Big to Sneak
- Aug 12, 2010
- Reaction score
- San Angelo, Texas
- My Car
- 1971 Mustang Mach 1
I am happy to see there are a few other AOD fans that also realize that higher Throttle Valve pressure over the factory spec (30-35 PSI) is not harmful, whereas inadequate pressure will lead to incurring damage to the AOD. I set our AOD up with 39 PSI, as it increases the road speed at which the 1-2 and 2-3 upshifts occur. Our setting is just a bit higher than the factory spec, but I was not willing to go much higher as too much of a good thing might become obnoxious or troublesome in having a tranny that shifts a bit more harshly than what I want. Increasing the speeds a little but for the upshift points is one thing, but having upshifts that are so harsh that they will knock the teeth out of my head is quite another.
For anyone wanting to see how to properly set the Throttle Valve pressure at the carburetor for an AOD equipped car I have two YouTube videos Lynda and I created and posted on YouTube. The 2nd video shows a bit more detail than the first video:
When I added a little tension to the TV cable on mine, the shift points were all messed up - I wouldn't even hit 35mph before it dumped into OD under normal driving - spirited take-offs shifted even quicker (telling me it was way too high). Then I found a post on one of the other Mustang forums with a line worker talking about how they installed the TV cable at the factory, which once I followed that advice (reset back to where it was when I got it, basically), everything was fine and the shift points were back to normal.
If you prefer the quicker shifts, then yeah a little bit of tension on the cable (i.e., higher pressures) won't hurt anything. It's having the slack that's bad because of low fluid pressure. Those are great videos, and certainly could offer some peace of mind knowing that it definitely won't burn up due to low pressures, but IMHO they tend to over-complicate things - several hundred thousand AODs set-up from the factory by simply ensuring there's no tension/no slack in the cable tells me everything I need to know.