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Yesterday my 97 Deville stopped changing gears at aroung 35-45 mph after I drove it for about 12 miles,I also noticed my temp was higher than normal so I carried it to a shop and the Mechanic said the transmission was burned up after he pulled out the dip stick ang smelled the oil.He said I need a new transmission.My question is can you tell a transmission needs replacing from smelling the dip stick? He just happen to have two to fit my car,one was a 92 Deville and a 97 Deville so he suggested the 92 would be the best one for my car because of the millage. Can a 92 Deville transmission fit a 97 Deville?Thanks I need help
 

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2010 DTS
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Yes you can tell by smelling it. If it is brown and burnt smelling, the trans is shot or soon to be. A '92 Deville trans is not compatible in a '97. The '92 is a 4T60E (mated to the 4.9) and the '97 is a 4T80E (mated the the 4.6 Northstar).
 
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