If you're talking about an E4OD
,.....Do yourself a favor and get one of three pans,...... and nothing else,......SERIOUSLY.
Moroso - part # 42050
MAC - part # 20590
B&M - part # 40295
,....the Moroso is the nicer of the three, considering it's made from what appears to be 6061 or 7075 aluminum stock that's tig welded to spec w/ a one-piece billet rail. BUT,....it a little more expensive of the three. It usually runs $185-$190 from Summit, Jegs or etc,....
The MAC / B&M (basicly the same pan) are made from cast aluminum. The MAC sells for $125-$130 directly from the Mfg.,....or can be found on Ebay from time to time.
The B&M sells for $175-$180 from the same as the Moroso (Summit, Jegs or etc...)
I found a seller on Ebay that had a couple of the MAC pans for sale. I made him an offer for both of them and snatched them up for $100 ea (shipped)
All of these pans have a couple of key features. One is that they have drain plugs, which makes servicing the transmission a lot nicer. BUT,....The main positive is the fact that they all three have a completely flat bottom, which makes removal & installation SO MUCH easier. Much better than those stupid, deformed looking 4x4
pans that Ford put on some models. If you've ever removed a transmission with one of those in place, you'll know what I'm talking about.
There's some other aluminum pans on the market, like Hughes, Trick-Flow and PATC that are reasonably priced, but they all have that weird shape, similar to the Ford 4x4
NOW,......there's other nice aluminum pans on the market like Mag-Tech, TCI, BD Performance and a few others, that boast 5-8 quarts over stock, but that's completely unnecessary. Not to mention, their prices are outrageous as they range anywhere from $350-$400 (for a ficken PAN)
The three pans I listed have 2.5 - 3 quarts over the stock 4x4
pan. This is plenty. Save your money wasted on the high price ones and put that in a good tranny cooler.
I also can't recommend the stamped steel one from Derale. I've personally had one and it was a complete P.O.S. Leaked like crazy and just poor construction in general.
I've been dealing with E4OD's & 4R100's for close to 15 years,.......so you can take it for what it's worth.