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Discussion Starter · #1 ·
I sent an email to usgear asking about an overdrive unit for the 6.7 and in specific the 6spd auto, here is reply

Thank you for your message about the Dual Range Auxiliary Transmission. I
do not anticipate an application being developed for the 6.7 Dodge.

Thanks for your inquiry,
Tom - U.S. Gear Customer Service
[email protected]
 

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Do you really need one with the auto? They are double overdrive and already have a pretty cruise rpm don't they.
 

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I don't think you would need it with the auto ? kinda waste of money wouldn't it be? maybe with a stick it might help some but I haven't seen a need for it yet on my 08 .
 

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Mr. Vehicle Destroyer
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the overdrive ratio on the 6.7 is much lower than my 5.9 because of the extra two gears you guys get. I think there is a lower rear end ratio available too right? 3.42? don't know. If you have a manual trans, the gear vendors unit for any 3rd gen 5.9 manual should work.
 

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gear vendors.
 

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Discussion Starter · #8 · (Edited)
Do you really need one with the auto? They are double overdrive and already have a pretty cruise rpm don't they.
No, I don't but there has been considerable talk about people wanting them to increase their mileage. So to put an answer to an often asked question I emailed both companies. I am quite happy with how my truck pulls. :)
 

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Discussion Starter · #9 ·
gear vendors.
I sent them a request also but they have not responded as of yet. I would bet money their reply will be the same. Both companies seem to be stuck in the we have enough units no sense developing more. Sad but true, cause there are certainly enough trucks sold to make it worth while I would think.
 

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4wd? What t case does it have?
 

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I would be interested in this for a 6 speed manual. I have 4.10's and at 75-80 mph I am at nearly 3000 rpm
 

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Si vis pacem, para bellum
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the overdrive ratio on the 6.7 is much lower than my 5.9 because of the extra two gears you guys get. I think there is a lower rear end ratio available too right? 3.42? don't know. If you have a manual trans, the gear vendors unit for any 3rd gen 5.9 manual should work.
the 3.42 rear end ratio option was only available for the G56-equipped trucks. With the final gear ratio differences between the G56 and the 68RFE, the 3.42 gears behind the manual make the final drive RPM's about the same as the 68RFE with 3.73 gears.
 

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at 70mph with my 68rfe i am right around 1900-2000 rpms and looking at either doing the pdf delete or getting rid of the 4.10's and go with 3.73's looking to see what will get me the better mileage gain
 

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Si vis pacem, para bellum
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at 70mph with my 68rfe i am right around 1900-2000 rpms and looking at either doing the pdf delete or getting rid of the 4.10's and go with 3.73's looking to see what will get me the better mileage gain
I would say the DPF delete coupled with the EGR delete will yield you far more positive results in the long run than a gear swap, though unless you are towing REALLY heavy i can't see any need for the 4.10's either. I have 3.42's behind my manual (which I think almost equals the same final drive ratio as a 68rfe with 3.73's) and i haven't hooked up to anything yet that the truck struggles to pull, to include a 19000lbs. power swivel. Aside from the mileage gains deleting the DPF and EGR will also prevent your turbo from going south over and over again until you are out of warranty and replacing them on your own dime or sooting up your motor so it will choke and die long before it's time. The 6.7L CTD was not intended to have an EGR system on it; the EGR is a cancer for the engine. My advice is to surgically remove it ASAP.
 
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