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Chrysler Repair/'97 T&C tranny codes: speed sensor

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Expert: - 10/8/2011


Question
You helped me fix the overhead OAT no workee a couple months ago, so I knew
where to come for the new issue.
Auto trans has started bucking/hard shift, when car is cold, followed by no shift from 2nd.  Codes 700, 715, 731.  
TUrn car off, restart, all same until it reaaches operating temp OR I clear codes, then OK for some inconsistent period, then it happens again.  (limp mode??).
Sometimes,foot off gas, coast for 10-15 seconds and it will go ahead and shift half the time.  Verified same codes, 700, 715, 731.  
From what I read seems I need to start with replacing the input speed sensor, as
the speedo is fine.  You agree?
I think I see two sensors screwed into the FWD side of the tranny
bellhousing/case.  
1.  Is the input the one closer to the engine?  
2.  Can I change the sensor without losing fluid?
3.  Any other traps I should watch out for?
4.  Should we drive the car?
What size socket/wrench?

Answer
Hi Lee,
The input is the one closer to the engine and the 715 point to it, along with the 731. No fluid loss should occur. Lift the tab to release the plug, be sure that the weather seal isn't lost or retained with the old unit. You are in 'limp-in mode' when it won't shift out of second and that is designed to avoid damage due to the failed part. You will not want to drive it unnecessarily if for no other reason than fuel economy. I don't know the size of the socket. The torque spec is 20 foot-pounds, similar to a spark plug.
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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