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70 SEVILLE 4 SPEED TRANI

Started by VICTOR INSKO, August 12, 2005, 10:28:28 AM

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VICTOR INSKO

August 12, 2005, 10:28:28 AM
I am fairly sure that the Cadillac convertable diville came with a four speed auto. transmission. The car now has about 70 k miles and the transmission only shifts 3 times. The car has been in the hands of my sister and her husband. They say the trani has never been out of the car but, they did pull a trailer to Florida from Michigan once. Can any thing cause the overdrive gear from shifting and still allow the other gears to run strong?

Rob Gerace #16100

#1
August 13, 2005, 02:06:01 AM
If Im reading you right, you have a 70 DeVille Convertible?  If that is so, then you have a 3-speed THM400 transmission.  The early hydramatics, 41-64 in Cadillacs, had 4-speeds, but a 70 would be 100percent guaranteed to have a 3-speed from the factory.  So, if thats the case, you can now sleep at night.  

By the way, the 4-speed reappeared in the early 80s for Cadillac with the THM-2004R, which was pretty crappy.  


I hope that helps you out.

Rob
66 SDV

Brian Rachlin

#2
August 15, 2005, 09:51:37 PM
Victor,

Your trans does not have a 4th gear, OD, Lock-up converter, or anything else.  

It would be nice if they did, to get better fuel economy, but 3 gears is all you have to work with.

Brian
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