ohh ok i must have misunderstood between the 5.9 and 6.7

 

Personally,.....I think the 5.9 engine is a better choice simply because it does not have all the emissions garbage on it. Our two Dodge Dealers down here in southeast N.C. have been seeing alot of problems with the 6.7 engines. With that being said,..... no offense to anyone here that owns or likes their 6.7.

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John_P

 

If you want an engine that has a proven track record, is super reliable, and has all the power you need, get the 5.9.

If you want to take a chance, get a 6.7. I had one, and I got rid of it. I got tired of the "check engine" light coming on, I hated it when I opened the hood and saw tons of emissions garbage, and I also disliked that it was so "quiet". It doesn't even sound like a diesel truck IMO. On the plus side, I loved the 6 speed auto, and I liked the jake brake.

The 5.9 with the 6-speed auto and the jake would be my perfect truck. Unfortunately, to get the 6-speed auto you also have to get the 6.7 emissions monster. Life ain't fair. Good luck with your decision. It's not easy.

 

yeah it is definitely a hard decision, as of right now i am leaning towards probably a 06 or 07 5.9L. how is the 4 speed? and what on average do you get for your mpg?

 

I've got no real issues with my 48RE, other than the 1-2 shuttle shift. My commute daily round trip to work is 50 miles, about half highway at 60 - 65 mph and the other half in town. I consistently get 18 - 20 mpg, hand calculated (the overhead liar will read 22 to 24 mpg).

 

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My 2006 Dodge CTD CR gets about 16-16.5 MPG in town and about 17.5-18 MPG on the highway. That is with the TST and Smarty turned down some though.

I have made aftermarket upgrades to my 48RE transmission going with a full ATS Transmission and have had no problems at all with shifts or anything.

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John_P

 

My 48RE just bit the bullet, but that was due to poor maintenance on the previous owners part. I'll be picking my new "built" truck up today. Before it bit the bullet though, city was right around 16 and as high as 21 on the highway. I'd imagine with a good transmission again, the city mileage may go up a fair amount.

I bought the truck chipped though, so I should have seen it coming as far as the transmission goes. No need to worry anymore though, now it's time to mod!

 

wow those aren't bad numbers either for such a heavy rig, this is a dumb question but can u explain what a tst and a smarty are?

Thanks for all the responses this is really helping me understand a lot more that i cant read about

 

test drove both.2mpg diff.on highway(in favor of 5.9).and the 5.9 w/ 48re tached 200 more rpm.I bought 5.9 because of the 2 mpg better.It was at 1700 at 60mph v/s 1500 for 6.7.

 

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Jagsfan:

Yes Sir, I will try to explain the "TST PowerMaxCR" and Smarty to you.

The TST PowerMax CR Module is a power module designed to increase power and torque by intercepting signals from various sources and then "modifying them" to add more power. In other words, the truck thinks everything is normal from the signals but in reality it is putting out more power due to a change or "modification" of these signals. The TST module does this by changing signals in various areas including connections to: injector harness, map sensor, camshaft sensor, crankshaft sensor, rail pressure sensor and on some models, the pyrometer. With the TST module, the ECM is involved, in
in that it "calculates" all the signals we talked about above, but is being "lied to" by the TST module.

Where the TST PowerMax CR Module connects to the injector harness, camshaft sensor, crankshaft sensor, map sensor etc., the Smarty works differently. The "Smarty Programmer" connects DIRECTLY to the ECM itself,
which is the most powerful computer in our trucks, and basically "reprograms" the ECM to put out more power through changes in the ECM. There are different "levels" and programs for the Smarty from "mild-to-wild", but some of the areas it can change is: rail pressure, timing, etc. Because the Smarty is connected right to the ECM, you also have the capability to clear "Diagnostic Trouble Codes", change top speed limiter settings, and also adjust for different tire sizes which affects the speedometer readings. The TST module is unable to do these things.

IMO,....working together, the Smarty and TST gave my 2006 MUCH MORE bottom-end power and take-off.

Hope this has helped you some and that I explained it O.K.
There is alot to it, for sure.

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John_P

 

5.9l - for sure!

 

ya that really made it easy to understand, thanks , i would assume that by increasing the smarty and the tst that it would affect the mpg for the worse?