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transfer case fluid


Well-Known Member
April 21, 2010
Reaction score
City, State
Hampton, VA
Year, Model & Trim Level
'97 xlt 4x4
The 5r55e calls for mercon V but the transfer case calls for mercon? That doesn't make much sense since mercon v is supposed to replace all mercon fluids. Somebody told me today that I was supposed to put the dexron/mercon general fluid in the transfer case but would it be better to use mercon V? Also, does anybody know how much the 5r55e holds? I hope to drain the t-converter. The only fluid I can imagine will be left after I change the filter and drain the converter will be in the lines and cooler. Thanks for the help.


Explorer Addict
March 15, 2004
Reaction score
City, State
Clinton Twp, MI
Year, Model & Trim Level
'96 XLT V8 4WD
when I went to fill my 4406 the guy at the store (really knowledgeable guy) said

mercon v is newer, like 2003+ (dont quote me on the year, I could be off)

and dex/merc is like mercon II and thinner, and was in late 90's vehicles.

he also said all mercon v is synthetic while you can get dex merc in either dino or synthetic versions

I went with sythetic dex/merc