Normally, whenever I see an add for a Transmission Flush, I ask them what do they use for Fluid, seeing as I have a Ford product. Normally, they answer with "Dexron III/Mercon. When I tell them that my Fords call for Mercon-V, almost always answer with "we never had any problems using Dexron/Mercon". I've even told them that my Owners Manual tells me "Do Not Use Mercon, only
Mercon-V". Don't matter to these guys. (What the heck, it's not their car).
Well, I saw an add in my local paper from GoodYear. Part of the add goes like this:
$89.99 Transmission Fluid Exchange
We replace all transmission fluid including fluid in the Torque converter, Transmission cooler and all transmission lines. Fill with OEM approved transmission fluid.
Well, I went to their Leesburg (FL) store and talked with their Service Manager. He said that yes, they use DexronIII/Mercon, however for Ford products they include an additive that converts the Mercon to Mercon-V specs. I asked him to show me the additive. He went and pulled out a bottle of additive (forgot the brand name) that states on the bottle that it turns Mercon to Mercon-V specs and no Torque Converter Shudder. (He also showed me a bottle, same brand name, that converts Dexron/Mercon to Chryslers ATF-3 [not ATF-4] specs.)
Never knew they had such a thing. One of these days, I will have my MM flushed out.