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post #1 of 11 (permalink) Old 11-25-2005, 02:25 PM Thread Starter
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Used 4R70W questions

Hey there, so I have been searching some local junk yards and found a couple transmissions I might be interested in.
I have found a number of 4R70W's from the 99+ Crown Vic and Grand Marquis for around $250. Is there anything that is different about these that I need to watch out for or should they all be the same? Of course I would check milage and obvious damage, but were there any mechanical differences I should be aware of?
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post #2 of 11 (permalink) Old 11-25-2005, 02:38 PM
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yeah you don't want the police vehicle 4r70w.

For the vic/marquis/stang you won't be able to keep the speedo accurate if you have a steeper gear than 3.27 without a speedcal box.
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post #3 of 11 (permalink) Old 11-26-2005, 01:54 AM
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Quote:
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yeah you don't want the police vehicle 4r70w.
I forget why that is. The output shaft has an incorrect number of teeth on it, right?
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post #4 of 11 (permalink) Old 11-26-2005, 02:43 AM
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main reason is the tailshaft is too long.. won't be able to run the stock driveshaft


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post #5 of 11 (permalink) Old 11-26-2005, 05:01 PM
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It's the extension housing that determines the driveshaft length, the cop car has the undesireable output shaft.




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post #6 of 11 (permalink) Old 11-26-2005, 07:11 PM
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Quote:
Originally Posted by GreenBird
It's the extension housing that determines the driveshaft length, the cop car has the undesireable output shaft.
No the output shaft on the police vehicles are longer.
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post #7 of 11 (permalink) Old 11-26-2005, 07:50 PM
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The output shaft and the extension housing housing are both longer on the police cars and town cars.

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post #8 of 11 (permalink) Old 11-28-2005, 08:04 AM Thread Starter
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Ok, cool, so a standard Crown Vic or Grand Marquis 4.6 should work just fine, just repin the harness?

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post #9 of 11 (permalink) Old 11-28-2005, 11:59 AM
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That and replace the TCC if you are putting it in the 95, swap the manual lever from your old trany and install a NEW MLPS.
Oh, and you will need to get the proper speedometer gear for an 8 tooth output shaft that will be in the new tranny instead of for the 7 that is in your car.

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post #10 of 11 (permalink) Old 02-01-2006, 09:40 AM
 
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Everytime I talk to friends who work in the industry, they say that there are considerable problems that can result installing transmissions from different models into the Mark VIII. Even if you swap the MLPS, TCC, the speedometer gear, and the wire hraness, I'm told that it still won't be quite right. They mention computer problems, gear ratio differences, and just general things.

Is this the case? Do the internals work perfectly in all the 4R70W cars? And if that is the case, how can I it be explained?

Last edited by Calabrio; 02-01-2006 at 10:36 AM.
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post #11 of 11 (permalink) Old 02-01-2006, 11:00 AM
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There are no problems from the swap if you know what you are changing completely.
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