This may sound real dumb but I can’t seam to find out what tranny model number I have. Can someone tell me where to look? These are the numbers I found on a metal plate on the tranny:
3K
M4x4
F8UP MB

I was looking for Model number like 4R100 or 4R70w but not successful.
Any help will be much appreciated.

\1stPopeye
1998 F150 XLT 4x4

 

Look on the blue tag on the driver's door opening. Under TR will be either a U or an E. U means 4R70W and E means E4OD.

 

U Have A 4r100