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I have a 1999 3.9 magnum with an automatic transmission.....does anyone know what model transmission it is or could be?
 

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Yes is the simple answer. Starting in I think 96, the trans' went from RH to RE and GenII Dakotas with the 5.2 seemed to have the 46RH. Bottom line though, GenIII Dak and GenI Dur were 3.9/5.2/5.9 with 42/44/46, respectively.

You'll also see 5-45RFE thrown around, the 45RFE and 5-45RFE are identical. The difference is programming that allows a second overdrive gear. Hemi Rams also use this transmission, among others...
 
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