hey guys just picked up 01 superduty 5.4 with i believe the 4r100. it only has 50k. i was told it had a complete flush around 40k. fluid looks good. whats you guys experiences with theses trannys?? where are the weak points etc..?? im familiar with 4r70w and im hoping for the same reliability.

 

The 4R100 is a beefed-up and improved E4OD. Both have been fairly reliable.

Steve