Dodge cummins 5.9 or 6.7 ?
I'm looking to buy a newer truck for hauling a 5th wheel. For those who have had both 5.9 & 6.7 engines, which do you think is better and why? Right now I'm leaning towards the 5.9, because it has a l...
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up2nogood wrote:Bedlam wrote:
I think when GM started using the Allison around 2001 for its pickups, it made the others up their game. Ford brought out the 5R110 with the 6.0 PSD in 2003 and 6R140 with the 6.7 PSD in 2011 while Dodge held out until 2007 with the introduction of the 6.7 CTD and 68RFE (although still weak compared to the competition)and finally started using the Aisin in 2013.
Explain weak compared to the competition :h
Stock for stock, it doesn't have as much holding power as the other two transmissions. However, for our typical duty cycle for towing RV's and other typical trailers for a class 3 vehicle, it's adequate. The 68RFE (stock) is pretty much limited to 800 lbft of input as per RAM, which is why they don't offer a hotter tune stock for that transmission and why they went with the AS69RC Aisin transmission for the high output 3500's (which are pushing 900 lbft of torque at this moment). However, the 68RFE can be beefed up significantly to handle much more power as is the same case with other transmissions.
