- Joined
- Jan 17, 2015
- Messages
- 1,828
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- Location
- California
- My Car
- 71' Grande project.
Who wields the magical power to accomplish that?This should be extracted and put into the Wiki.
I rebuilt mine in my 1969 Mach 1, back in 1974. I used B&M internals, and valve body components. It was a really strong tranny, and oh so very heavy with its cast iron case. But durable.Thanks for sharing!
That is GREAT info. I've rebuilt mine (don't think I would want to do it again).
Rod
Good to know re: AOD governor. I have increased my AOD Throttle Pressure PSI from the factory 35 PSI to about 39 PSI in order to increase the road speed the upshifts occur. It worked out nicely, but I may dink with the governor a bit next as opposed to bumping the TV PSI any higher - not that I am worried about a little more TV pressure. But, the governor was be a more surgical approach to reaching the result I am after. I will check out what Cobra offers in that way,Governor anti-stick spring was from Cobra transmission parts.
https://cobratransmission.com/a404-a670-spring-governor-anti-stick-200129-1
The captured governor spring I used was the stronger black spring (there are two that look similar, see circled spring in pic) out of a Transgo SK 700-Jr kit. The application is a 700R4 (cut the spring in half where the coils are touching each other, use the shorter half). It had a seat pressure of about 2.25 pounds while the stock spring was about 1.5 pounds. I think you could also use the anti-stick spring out of the Transgo kit (in Liew of buying one from Cobra), but the wire gauge is thicker, and may require machining the governor a bit to make up for the added thickness of the collapsed spring.
The AOD's use a stiffer spring along with a lighter governor to raise WOT shifts. Unfortunately the AOD governor guts are different enough that they don't interchange with the FMX. I bought the high RPM kit for an AOD and reverse engineered it to apply to an FMX. Don't go buying a Transgo AOD- HIRev kit and expect it to be of any use on an FMX.
Machining the governor itself to lighten it is a bear. It is case hardened and requires carbide tooling. I machined a recess into the outward end of the gov with a 17/64" carbide ball mill after I drilled it with a .110" drill (drilled all the way to the center "spool" I also used a parting tool on the lathe to cut a groove in it. The 6 holes around the perimeter of the spool were cut with a 9/64" carbide endmill. I may be talked into doing some for folks on the forum, but the tooling and time is not cheap.
With mine at full weight (about 16 grams) it shifted at 5K, with the weight reduction to about 11 grams it shifts at 6K. These numbers are with a Transgo 37-1 kit installed in the transmission and a lightly spicy converter.
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