The Unofficial "Ask a Stupid Question" Thread

[Grog6]

For a lower viscosity fluid, the orifice size would change on all of the solenoids, the EPC valve would change,valvebody, everything. It's literally a new case. Those trans do not swap with ours, IDK what plate changes there were, but they would not work for us. Our 4r70 needs a plate that releases cleanly with no chattering, and then has fast lockup when the clutch closes. The apparently, direct is also held closed with pressure; that going away from the scarf cut seals smokes a transmission before you can move your foot.

 

[MadMikeyL]

It's a completely different fluid, and will not grab like Merc V does.
It will toast either a 4r70 or 4r75, but works in CVT transmissions.
If you put it in our cars, you will be walking home from the first stopsign, lol.

MerconLV is not CVT fluid. CVT fluid is its own thing, that is entirely different from any automatic transmission fluid.

 

[MadMikeyL]

...why not ask AI:

View attachment 17611

Though I'm not sure how these changes relate to the fluid switch.

They don’t. MerconLV is a much lower viscosity fluid than MercIII or V. The change was likely done for fuel mileage ratings and nothing else. The 4r70s of that era went 300k miles no problem with the MercV, so they probably did some testing and determined that the thinner fluid would reduce pumping losses, and would not cause a failure within the warranty period.

 

[theterminator93]

To Mike's point, Ford did also change the oil weight recommendation for the 4.6s from 5W30 to 5W20, purely to squeeze out as much in MPG ratings as they could.

I remember asking Darrin about Mercon LV in the trans he built for me. Told me to stick to Merc V. That was good enough for me. I still use 5W30 too.

 

[1997ThunderbirdLXV6]

The change was likely done for fuel mileage ratings and nothing else.

I can absolutely believe that!

So then it would be interesting to know if there was any drop-off in long-term reliability with model year 2009+.

 

[1997ThunderbirdLXV6]

@MadMikeyL
I think you're on to something.

 

[1997ThunderbirdLXV6]

Back to AI...but all it says is basically that there's nothing to say:

 

[Kidd-7]

...why not ask AI:

View attachment 17611

Though I'm not sure how these changes relate to the fluid switch.

AI isn't either...

 

[Kidd-7]

Are these the parts needed for the PI intake and heater hose rerouting?

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Amazon.com: Dorman 626-613 HVAC Heater Hose Assembly Compatible with Select Ford / Lincoln / Mercury Models : Automotive

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[MadMikeyL]

Yup, those are what you need.

 

[Grog6]

We were talking about this earlier:

At the height of the who has the fastest SC arms race it definitely happened to a few cars. If you’re going for consistent quarter mile ETs you cannot beat an automatic, plus the IRS copes substantially better from a launch on drag radials with a high stall converter automatic in front of it than it does a manual with a 5000rpm clutch dump.

There actually was a time the predominating club culture kind of considered 4R70w to manual swaps sacrilege, certain people took the notion like it was a personal betrayal to Jerry W.

The mods to sc's was the reason for the split from sccoa, from what I heard over the years. About that time the lincoln purists made LOD. I wasn't an mn12 owner 'till '99.