blown99 Posted October 3, 2006 Share Posted October 3, 2006 What is your guys opinions about changing over to synthentic ATF on a 4R100 behind a 7.3L? I've got 54K on mine and it hasn't been touched yet, that I know of, and it is due for a service. I've had a E4OD loose second gear in the past, a month after switching over from regular ATF to synthetic so I am a bit leary about doing the switch on my daily driver. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted October 4, 2006 Share Posted October 4, 2006 You are probably okay to use synthetic Mercon provided that is what you use. Here is a quote directly from the service manual: Quote: CAUTION: Using a transmission fluid that indicates a dual usage (MERCON ® and MERCON ®V) in a transmission application requiring only MERCON®, may cause transmission damage. Use of any fluid other than the recommended fluid may cause transmission damage. NOTE: Refer to the fluid level indicator and the Owner's Guide for the type of transmission fluid required. Some fluid labels may indicate dual usage such as MERCON® and MERCON ®V. These dual-usage fluids are not to be used in transmissions that use only the MERCON® type fluid. These dual-usage fluids may be used in transmissions that require MERCON ®V use. Quote Link to comment Share on other sites More sharing options...
blown99 Posted October 4, 2006 Author Share Posted October 4, 2006 So what comes from the factory in the 4R100? Regular mercon or synthetic mercon? I know mercon V is not recommended for the 4R100 (although that seems to be debatable lately). Quote Link to comment Share on other sites More sharing options...
james richards Posted October 5, 2006 Share Posted October 5, 2006 factory fluid in 4r100 is merc 3 . latest bulletin says fluid reformulated . ok to now use merc 5 in all . flush lines with flush machine refill with merc 5 should be no problems . ford is discontinuing merc 3 when supply si gone all that will be avail is merc5 for everything Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted October 5, 2006 Share Posted October 5, 2006 With that said, READ THIS THREAD. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.