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post #1 of 5 (permalink) Old 09-02-2018, 11:40 AM Thread Starter
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95 cougar trans replacement

Hello,

i have been looking for a trans for our 95 cougar, believe I found one from a 00 town car.

Question in my mind is a statement I saw previously, "Any 4R70W not from a FN10 or MN12 has an 8 tooth output shaft" .

Are they talking about the driveshaft or the speedo gear??
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post #2 of 5 (permalink) Old 09-02-2018, 03:27 PM
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It refers to the number of teeth on the output shaft for the speedo gear. If you don't put the output shaft from your original trans into the one from the Town Car, you will need a different speedo gear (you can use my calculator here to play around a little if you like). You are also more limited in terms of what you can do, rear differential-wise, before you need a speedcal if you ever change gears. Generally speaking (as tire size also has a part to play with the math), with a 7 tooth output shaft you can use 3.73s; with the 8 tooth you're limited to 3.27.

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post #3 of 5 (permalink) Old 09-02-2018, 05:09 PM
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You will need to keep some of your internal solenoids; search, there's plenty of threads.

An 00 tranny is a good choice, but remember, it's 18 years old.

Any of these in a jy need the seals replaced at a minimum, unless you want to do this again in a year or so.

The tailshaft is 8 tooth, but iirc, thet's one step size in the internal gear. (they're replaceable, easily.)

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post #4 of 5 (permalink) Old 09-03-2018, 09:29 AM Thread Starter
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thanks for the information
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post #5 of 5 (permalink) Old 11-26-2018, 11:05 PM
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I have a remand one from a crown vic 02 model. would I have to change out any thing other than the spedo gear? what is the stock size of our tail shaft on ours? would it matter if it is a 10-1/4 or a 11-1/4 length.


not just that I also am putting in one for a client at my shop I noticed that the one he got from rock auto has no tail shaft. I am wondering why is that.


is the different models have different lengths that matter that much?

Last edited by 95mercxr7; 11-26-2018 at 11:20 PM.
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