Monday, Jun 11, 2012 at 16:18
esarby - This is the first time I've ever found an error in Redbooks detailed specs, as they are normally sticklers for precise details.
However, they have obviously erred in this case, by becoming confused at the vast array of transmissions that Chrysler have used in the multitude of Jeep models.
All transmissions are designated by forward speeds only, and always have been.
The problem arises from the fact that your transmission selector only shows three forward speeds - but the 42RLE auto transmission model that your vehicle uses, has a 4th OVERDRIVE gear - and the transmission changes up to this 4th OD gear, automatically, without you having to move the selector lever.
This is a somewhat similar arrangement to the auto transmissions with lockup torque converters (80 series Landcruiser) - whereby the transmission is actually a three speed, but the Overdrive 4th gear appears when the Torque Converter clutch locks up.
However, the 42RLE 4th OD gear in the Wrangler, doesn't involve a Torque Converter lockup - the 4th OD gear is selected automatically via two clutch packs being engaged by oil pressure from the transmission oil pump.
Your transmission is classified on all technical descriptions, as a 4 speed.
Cheers - Ron.
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