1-2 accumulator and mechanical diode
Hello...found this site by searching and getting linked to the transmission tech articles...great stuff in there!
I lost 2nd gear in my 94 Thunderbird, 3.8L NA. After driving about 20 minutes it would finally start to grab and it seemed to shift normally. Eventually I also lost third.
I tore it down and found a small amount of carnage. The spring that presses against the 1-2 accumulator piston was broken. I figure that I need to upgrade the piston but it doesn't look like the new piston comes with a spring. Anyone have a Ford PN? Hopefully this caused my no 1-2 shift until driving around for a while.
Also my direct drum was slightly chewed up on the outside. The frictions in that drum were worn down to the steel and cupped. By slightly chewed up I mean there is wear but really not that much at all. In a different tech article I got linked to, they mentioned to check the wear on the inside of that drum. The inside shows no wear. Good, bad, indifferent?
Also the steel housing that people replace with the mechanical diode setup has about 1/16" wear on the retaining tabs. The sprag only turns counterclockwise but there is a mid-pitched hum/squeal when it does so. Time to replace or is that hum normal? I have seen pulled mechanical diode setups go for about $50 and new units for about $150. This is a stock daily driver.
This is my first Ford transmission...so far it seems much more user friendly than the 700R4's I have rebuilt. Thanks for advice and I can shoot some pics up if it'd help.