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Rebuilt Transmission Fluid - 5R55S

derrickbj

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Hello. I just had my 5R55S transmission rebuilt in my '06 Explorer EB. I believe the transmission historically used Mercon V fluid, but the tech put in Mercon LV. Is this OK for the new rebuilt transmission or should I be taking it back for a flush? Thanks in advance.
 


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410Fortune

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I thought LV started in model year 2008 but lets see what the experts say

What does your dipstick say? Owners manual?
L = low viscosity
 




Explorer_PL

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This has been discussed to death here :)

6R60 = Mercon SP (2006-2007)
6R80 = Mercon LV (2008-2010)
5R55 = Mercon V all years, unless I don't know something.

I would flush it.
 




domct203

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Flush it, now, not later.

Mercon LV—the latest Ford ATF, it is factory fill in 2008 and later Fords. The LV stands for "low viscosity." It is a fully synthetic ATF. It is not compatible with earlier Mercon fluids, so it should neither be mixed with Mercon or Mercon V used to replace those fluids. It is not compatible with any other fluid, either. ”

Techtips - Selecting the Proper Automatic Transmisison Fluid
 




imp

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Flush it, now, not later.

Mercon LV—the latest Ford ATF, it is factory fill in 2008 and later Fords. The LV stands for "low viscosity." It is a fully synthetic ATF. It is not compatible with earlier Mercon fluids, so it should neither be mixed with Mercon or Mercon V used to replace those fluids. It is not compatible with any other fluid, either. ”

Techtips - Selecting the Proper Automatic Transmisison Fluid
@domct203

How can we know TechTips is infallible? imp
 




domct203

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Well then how about from Ford?

Motorcraft® MERCON® LV Automatic Transmission Fluid (ATF)
  • Premium-quality ATF for Ford, Lincoln and Mercury transmissions
  • Provides excellent performance in electronically controlled automatic transmissions
  • Manufactured with high-viscosity index, premium-quality, hydroprocessed base oils and specially designed performance additives
  • Provides excellent shifting characteristics at high and low ambient temperatures, and guards against transmission shudder
  • Offers excellent thermal, oxidation and shear stability, as well as good low-temperature fluidity
  • Provides wear protection and inhibits the formation of gum, sludge, lacquer and foam
  • Helps prevent rust and corrosion
  • Dyed red for easy leak detection
  • Not for use in applications where MERCON® V, MERCON® SP, Continuously Variable Chain Type Transmission Fluid, Motorcraft® Premium Automatic Transmission Fluid, FNR5 Automatic Transmission Fluid or Type F Automatic Transmission Fluid is recommended
  • Not for use in transfer cases
  • Recommended by Ford Motor Company
  • Available in cases of 12 one-quart bottles”
USA - Motorcraft
 




digifoss

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Being that you just spent some hard earned money having your transmission rebuilt, I would recommend making sure you got the right oil in it.
 




410Fortune

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what kind of a trans builder tech would do this? I mean seriously the wrong fluid can kill your trans in short order and can be very difficult to flush it ALL out
I would be fighting for an extended warranty on this rebuild
 




digifoss

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Just curious. Are the transmissions that are being rebuilt here lasting longer than OE transmissions ? I've seen several people that have had to have their transmissions rebuilt here. Do the rebuild kits include updated parts that supersede and fix whatever shortcoming was in the original transmission - i. e.. last longer than whatever OEM parts that are wearing out too fast ?
 




domct203

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There are some updates/fixes, like sleeving worn servo bores for example. I believe there are updates to the solenoid packs too.

IMHO, if I get 150K-160K out of the transmission, I’m fine with another 150K-160K with a rebuild. Even if I only get 100K out of a ‘bargain’ rebuild, I’d say it’s still a good deal with 250K+ on the vehicle by then.

If you paid $2000 for the rebuild, and get 100K miles that’s only $0.02 per mile (....hopes he did math right LOL)

As much I wish it so, they don’t last forever.
 




digifoss

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I have a 95 Suburban 4x4 that I had the transmission rebuilt at 190k miles - I didn't mind that. I also have a 84' F150 that I bought new, 5.8L and a C6 transmission. I had the engine rebuilt at 280k miles. Now at 308k miles, the transmission has still never been worked on, just fluid and filter changes every 30 to 40k. I keep my vehicles forever and keep them very well maintained mechanically so I am hoping that I can get at least 200k w/o any kind of major repair out of the Explorer. It's my wife's car and she puts maybe 3k to 5k miles a year on her cars so with 90k on it now, it may outlast us.
 




imp

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I have a 95 Suburban 4x4 that I had the transmission rebuilt at 190k miles - I didn't mind that. I also have a 84' F150 that I bought new, 5.8L and a C6 transmission. I had the engine rebuilt at 280k miles. Now at 308k miles, the transmission has still never been worked on, just fluid and filter changes every 30 to 40k. I keep my vehicles forever and keep them very well maintained mechanically so I am hoping that I can get at least 200k w/o any kind of major repair out of the Explorer. It's my wife's car and she puts maybe 3k to 5k miles a year on her cars so with 90k on it now, it may outlast us.
@digifoss
That C6 is likely the key to your best experience! The C6 was very well-designed, do a wiki on it sometime. One band completely eliminated by using clutches instead. imp
 




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