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post #1 of 4 (permalink) Old 12-19-2010, 05:36 PM Thread Starter
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mix mercon 3 and 5

I bought my 95 a year ago and it shifts fine. However I checked it today and it's low. Wen I bought it the guy said the trans had just been serviced. I don't know if it's mercon 3 or 5. Can I just add mercon 5? Are the fluids compatible? Don't want to change all of it in this weather.

1997 Mark 8 LSC

Former owner:
1996 Thunderbird lx 4.6
1994 Thunderbird lx 4.6
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post #2 of 4 (permalink) Old 12-19-2010, 09:16 PM
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Yeah you can add mercon w/ dexron III and you can also add mercon v. The mercon V is what I have been using for years. These cars originally had regular Mercon fluid specified for them.

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post #3 of 4 (permalink) Old 12-19-2010, 09:32 PM Thread Starter
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Yeah thanks. I'm going to drain it all and add mercon v when it gets a little warmer and dryer out. Already did the 96 and it works great.

1997 Mark 8 LSC

Former owner:
1996 Thunderbird lx 4.6
1994 Thunderbird lx 4.6
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post #4 of 4 (permalink) Old 01-08-2011, 04:26 PM
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The Mercon V is a semi synthetic trans fluid That works very well in the 4R70W. It can be used as an upgrade to lower #s like Mercon III but can not go forward to replace like a Mercon VI.
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