Need advice ford trans

Joined
Jan 29, 2008
Messages
43
Location
New Jersey
Hi all. My father in law has a 99 ford f150 and calls for mercon v. The truck has 120000miles and of course the trans was never serviced. He is hesitant to do it because he thinks the trans will go if we flush it. Fluid is not burnt but is discolored. I guess it would be brownish in color. Truck shifts fine. Should I flush or just drop pan, replace screen and refill? Should I just leave it alone all together? I believe it's a 4r70w. (not sure if I got the model right) if I change fluid what brand? Thanks in advance!!!
 
Joined
Jan 10, 2008
Messages
4,998
Location
Milwaukee, WI
No question I would buy a new gasket and drop the pan. What you do from there will probably depend on what you see, but you can't go wrong with a couple drain and fills.
 
Joined
Dec 5, 2007
Messages
449
Location
panhandle of florida
Do a couple of quarts at a time. Change two quarts, drive 500 to 1000 miles and then do another couple. Just keep doing it till youve gone through however many quarts it holds.
 
Joined
Dec 10, 2002
Messages
9,366
Location
USA
a couple of pan drops every few months is what I would do especically since the trans shifts fine.
 

NortheastPest

Thread starter
Joined
Jan 29, 2008
Messages
43
Location
New Jersey
I agree so far. I'm going to do a few drop and fills. Any additive that could be a benefit? I never had a trans that had mercon v so I'm not familiar with this oil
 
Joined
Mar 21, 2004
Messages
26,328
Location
Upstate NY
The only additive I would consider would be Auto-Rx. But you should run it for the mileage listed in the directions which is 1000 or 1500 miles (I forget) then get it out along with whatever has been loosened. A Magnefine filter will catch most of the crud yoru new ATF and/or AutoRx is loosening. Good investment of $20.00.
 
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