Tranny Fluid

[IDSTROKER]

I need to change my tranny oil some say mercron 3 and some say mercron 5 but not sure what 1 to use now is mercron 3 the same as dextron 3 i need some help

 

[WD40]

So is your 2003 a 7.3 or 6.0?

 

[IDSTROKER]

I have the 7.3 and tranny is a 4R100

 

[dboyw]

Unless there has been a change, I though the auto was to use only Mercon, not 3 or 5.

 

[trackspeeder]

Mercon V is ok to use.

 

[IDSTROKER]

well i"am not sure if it is just mercon or 3 or 5 some say not to use 5

 

[Butch Cassidy]

I just replaced the tranny fluid on my 2000 PSD w/ 4R100 transmision. The parts person at the NAPA store told me use only type 3 NOT type 5. I asked him why, he told me type 5 in my 4R100 tranny will kill it quickly. He also told me he has seen other 4R100 use type 5 - not good at all. To be safe, stick with what the manufacturer (F**D) recommends.

Butch Cassidy

 

[godofdew11]

my manual says specifically do not use mercon 5... my dad had run it for a number of months and had seen MUCH higher tranny temps while towing, now running mobil 1 mercon in both his and my SD. the next month after we changed him to the mercon we went to a show and we were both probably grossing 22kish, neither of us had any tranny temp problems,

 

[trackspeeder]

The old days you could only use Mercon / Dextron 3. Mercon is obsolete.
Mercon V is the replacement. It has been proven safe to use in the E4OD and 4R100 trans.

 

[IDSTROKER]

ok thanks for all the reply this helped me out