transmission question

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Aug 3, 2011 | 02:13 AM

78ecf250cs

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From: Maryville

transmission question

Can an automatic 4x4 transmission that was mated to a 4.6 liter work behind a 5.4 liter.

Aug 3, 2011 | 08:04 AM

Moto Mel

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From: Chesapeake, Va.

It will fit and work, but the real question should be: For how long will it work? The 4.6 has a 4R70 trans and the 4 5.4 has the 4R100. The 4R70 might not be able to handle the torque output of the 5.4 engine for very long.

Aug 3, 2011 | 08:39 AM

78ecf250cs

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From: Maryville

Thanks for the info moto mel. Can you tell me how I can tell the difference by looking. Is it stamped in the case or is there a tag on it?

Aug 3, 2011 | 09:44 AM

Moto Mel

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From: Chesapeake, Va.

There is usually a tag on the side of the transmission and yje numbers there will I.D. the vehicle that the trans originally came in. The 4R100 is a much larger transmission and has large reinforcing fins on the top of the case.
The P71 forum may have the trans I.D. information, I have had good results there.
Also, if there is no tag on the trans it may have been remanned by Ford. They remove that info during the reman process.