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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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24,483 Posts
Definitely change the fluid and filter. Use ATF+4 only. Dropping the pan will give you a look at how much or what kind of debris is at the bottom of the pan. Hopefully the varying tach and speedometer aren't signs of slipping converter or transaxle clutches.
Check the magnetic tips of the speed sensors for iron filings. This can distort the TCM's sense of true input or output speeds.
If you are sure that the fluid loss isn't from an external leak, then check the radiator for a possible ATF cooler leak into the antifreeze?
 

·
Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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24,483 Posts
As long as it meets Chrysler MS-9602, it is ATF+4.
http://www.valvoline.com/pdf/atf_+4.pdf
The input speed sensor is next to the dipstick tube. The output speed sensor is the one that drives the speedometer and is the one on the drivers side, front of the transaxle.
 
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