First off you really need to be running Mercon V in your tranny unless it's pre '98 vintage. As far as additives, can't say. Wy bother. There are plenty of Mercon V fluids out there.
Originally posted by JustinH Mercon V is the fluid of choice in ANY 4r70w transmission.
Period.
JustinH
It wasn't until late 97 early 98 that Ford started putting Mercon V in the trannys. Look on the trans dip stick, it should tell you to use Mercon or Mercon V.
When I changed mine about 6K ago, I put in Castrol Mercon/Dextron III, and no problems.
Adding a friction moidifier to MERCON makes it MERCON V, most tranny shops just stock one kind of fluid, and if they need MERCON V they add the modifier. Any 4R70W can be refilled with MERCON V, although they originally came with MERCON, but don't put any modifier in a 4R100, it only takes MERCON, never MERCON V.
Yes you are right the earlier 4r70w's came with mercon V from the factory.
There is a ford TSB out that recommends Mercon V in all 4r70w's for torque converter shudder.
Regards,
Justin
Quote:
Originally posted by mims JustinH
It wasn't until late 97 early 98 that Ford started putting Mercon V in the trannys. Look on the trans dip stick, it should tell you to use Mercon or Mercon V.
When I changed mine about 6K ago, I put in Castrol Mercon/Dextron III, and no problems.
I talked to a number of places around town and they all used the mercon fluid with a modifier. That's not what I wanted, so I went to ford.
None would put synthetic in. If I wanted to use synthetic I had to argue just to be able to buy my own fluid and pay half price for the change using the fluid I supplied.
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