The current 3.7 has the 42rle as far as I know, unless they changed it in 2010.

 

Mine has the 545rfe last I recall. I can't for the life of me find the tag where it says it (believe me, I've looked), but I count five gears and TQ lockup in fifth. The only thing is that my truck LOVES to skip gears. The tranny absolutely HATES this motor, and vica-versa. That really is the only reason why I do 80+ on the HWY is because the trans wants to get into overdrive so bad, but the motor only makes power over 2 grand. Hell, It pulled a trailer full of subaru station wagon up a mountain at 80 and didn't complain. The moment you drop below that, and even the wind can make the trans panic. Either I'm gonna have to get some gears and build the tar out of a 3.7, or I'm gonna have to bolt in the new v6 when I blow this one to smithereens!

 

From everything I've read the only auto w/ the 3.7 Ram has been the 42rle, that's what shows up when you build a new one on dodge's site.

 

the 45rfe and the 545 rfe have been behind the 3.7L only in the ram since 2002.

Applications:

45RFE
1999–2000 Jeep Grand Cherokee (4.7L)
2000-2002 Dodge Dakota (4.7L)
2000-2002 Dodge Durango (4.7L)
2002 Dodge Ram 1500 (3.7L and 4.7L)
545RFE
2001– Jeep Grand Cherokee (4.7L, 4.7L H.O., 5.7L Hemi)
2002-2007 Jeep Liberty (2002-early 2003 3.7L, and all diesel applications)
2003– Dodge Ram (3.7L, 4.7L, 5.7L Hemi)
2003– Dodge Dakota (4.7L, 4.7L H.O.)
2003- Dodge Durango (4.7L, 5.7L)
2006- Jeep Commander (4.7L, 5.7L Hemi)


Link:
http://en.wikipedia.org/wiki/Chrysler_RFE_transmission

i can find more proof if you need it.

the 42rle is only behind the 3.7L in the dakota, nitro, liberty, 3.5L 3oom, 3.7L durango, 2.7L,3.5L magnum, 2.7L,3.5L charger, 3.5L challenger and the 3.8L in the wrangler. all in the v-6 application

 

okay after more research we are both right.

the 45rfe,545rfe came behind the 3.7L ram from 2002 through 2005.

2006 to present the 42rle was put behind the 3.7L ram.

 

OK, I thought they only used the 42rle.

 

only from the years 2006 to present.

which would make the 2002-2005 3.7L ram have a stronger drivetrain with the bigger transmission.

 

on cape cod you enter exit 6 at a 34% grade then go downhill off the cape, coming back on cape getting over the bridge to a 41% grade ive learned one thing, put the truck in the power band, 2800 rpm and let it fly!you need to work the engine thats rediculously underpowered for a vehicle of the rams weight. Although the little stuff i put on my truck seems to have freed up RPM's the truck as a v8 still doesnt like hills. Face it guys, its not your dads kinda truck from the 70's and 80's with a manual and a straight six designed with moving houses in mind.

 

Wrong! Heres part of my build sheet from Dodge, my 06 V-6 was factory equipped with the 42rle. Build sheet is all the proof you need.

According to our records, your vehicle was equipped from the factory
with the following:
*P9 Cloth 40/20/40 Split Bench Seat
-D5 Med Slate Gray
AGR SXT Appearance Group
APAS Monotone Paint
A62P 3.7L Eng(EKG)/4Spd A/T VLP(DGV)
BAZS 136 Amp Alternator
BCES 600 Amp Maintenance Free Battery
BRRS 4 Wheel Disc Rr Anti-Lock Brakes
CBEP 40/20/40 Split Bench Seat
CFMP Rear Folding Seat
CGDS Front Height Adjust Shoulder Belts
CG3S Advanced Multistage Front Air Bags**
CKEP Front Seat Area Carpet
CLEP Front & Rear Floor Mats
CSPS Passenger Assist Handle
CUES Rear Underseat Compartment Storage
DGBS All 4-Speed Automatic Transmissions
DGV 4-Spd. Automatic VLP 42RLE Trans
DHAP Lock-Up Torque Converter
DMH 3.92 Axle Ratio
DRBS Corporate 9.25 LD Rear Axle
EAGC All Gas Engine
EKG 3.7L V6 Engine

 

Oop jumped the gun. Sorry!