which tranny does my 99 f350 ( 4wd, auto ) have? ( 7.3psd )

[3930dave]

When I did the Trans Service on my old-but-new-to-me 4R100, there was sludge in the pan.

Drilled out the pan, and brazed on a drain plug (some factory pans had 'em, some didn't). Did a few cycles of running conventional ATF, and dropping 6L at a time from the pan.

Once things started running cleaner, I switched to synthetic (Amsoil ATF).

Magnefine did enough factory testing with Ford, that dealers started installing (up here, at least) a Magnefine filter when doing 4R100 swaps. I seem to remember something about an ATF service interval extension when running Magnefines, but don't have a Ford link handy for that. I've cut one apart, and liked what I saw (intact filter, beefy magnet collecting fine metal, a decent bypass design, and a strong filter body).

Rgds, D.

 

[dieselcrawler]

Best thing you can do for a stock 4R100 is add a bigger trans cooler. The factory cooler from a 6.0/5R110 truck is popular, its huge by compairison. I had the trans rebuilt in my dually at 150k miles, torq converter replaced under partial warranty at 175k, and was starting to give me some minor issues again when I stopped driving it 2 years ago at 220k. The trans is the weak link in these trucks... that's why I like my F250, its a stick, and pulls like a freght train.