i have looked around and cannot find exactly what im looking for so here we go, i have a 2001 Durango 4.7 2WD and all of a sudden the trans is going into limp in mode. codes are P0732 P0734 and P0733, no other codes...... reset and test drive later on to see what it is doing, has a delayed shift into drive and then is ok, will go up to 3rd gear and then have a shift flare into it and will try to go into 4th gear and then the check engine light comes on and limp in mode........ car has 100k on it.... fluid is full and red and not burnt, slight leak at pan. just wet, no drip.... never had an issue until this morning.... only thing that changed was the weather, we went from 65 plus yesterday to 20 this morning here in Big D....... the speedo operate correctly, im down to possible speed sensors or internal trans issue.... pan has not been dropped and i took out one sensor to look and seemed ok. little debris on it... any help would be great.......
45RFE issue
Two Durangos
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51 Posts
there was a write up about it..... really good and that's where i found it
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6,435 Posts
Thats not where the extra gear comes from.. the 45RFE does already make use of both 2nd gears. "2" is used during normal shifting, while "2 prime" is used during hard acceleration and kickdown.
The extra gear is a 2nd overdrive. It does NOT kick in when OD is off or if the speed does not go above 48mph. This is a major concern if the truck is driven mostly in the city becuase it will actually hurt your mileage a bit.
Because it is a 3 planetary transmission with no bands, the 45/545RFE are actually capable of producing 10 forward gears and 2 reverse gears. some are unused because they are overlapping or not wide enough gap.. but thats how you are able to "program in" the extra gear by doing the TCM swap.
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51 Posts
yeah, what he said!!! ^^^^^^^^^^^^
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