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Chrysler Repair/transmission: gear ratio errors

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Expert: - 12/7/2011


Question
Just put a 1999 Chrysler transmission into my 1997 Chrysler town and country. Changed the speed sensors both input and out put. The car drives fine at first , then after awhile it reves into neutral and will not shift , occasionally it will catch and then back to neutral.
Does the computer have to be reflashed?  The error code I get are gear ratio 2 incorrect, gear ratio 4 incorrect.

Answer
Hi Gerard,
Gear ratio errors are typically associated with problems with the internal clutches. Was this a used transmission or a rebuilt one?
There is a learning period shortly after a change out of the transmission or the trans control module. You can try doing some repeated accelerations from 0 to 50 at a moderate throttle opening to see if the 'learn' will cause improvement.  I an not knowledgeable about reflashing issues, but if the transmission has the same model number as the old then it is probably not materially different.  I will see what else could be the cause and let you know by a revised answer.
Roland

Chrysler Repair

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Roland Finston

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I specialize in Chrysler/Dodge/Plymouth cars, minivans, and SUV's for the model years 1982-2008 based upon my 50-year DIY experience, factory shop manuals and wiring diagrams. I offer fast repair advice to help you minimize repair costs by helping you diagnose and do it yourself. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty.

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Five decades as a 'do-it-yourselfer' on domestic and imported cars

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Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

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Degrees in Physics/bruised knuckles.

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"Top expert of 2010" and "2011" at Allexperts. Among top 50 experts for years 2006-2009 at Allexperts.

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