6.7L Performance Discussion of 6.7 Liter Dodge Cummins Diesels Related To Performance And Longevity

68RFE mods for strength

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Old Jun 22, 2011 | 04:25 PM
  #1  
jpthomso's Avatar
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Default 68RFE mods for strength

What is everyone doing to build up their tranny? I'm new to this, been driving a stick for years. Been thru a few clutches.

H&S mini max has a tranny tuner in it but they sell the Overdrive program for another $300.

I have already ordered a BD deep pan and their Pressure Lock plug-in. I am going to pull a 30' trailer to haul hay and move my dozer around. No more than 1000 mi per year on these though.

My first Dodge cummins (1999 new) had an automatic. Around 8000 miles the torque converter decided to dismember itself and flow thru the rest of the tranny. After Dodge put in a new tranny, I sold the truck. Decided that I didn't need a truck with a weak tranny.

After 4 more 6 spd sticks, I bought this 08 6.7 Cummins with the 68RFE. Have heard great things about it. Plus now into my older years my thought was I'd lose the clutch now that I could get a 6 spd auto.

Reading the forums, I hear about 5th & 6th issues due to the tranny falling into them at to low of RPM, even with a load. I have only driven this truck about 500 mi now and can see how it does work like that. Have not pulled a load yet. I am curious though. If I turn on the load switch, will not the stock program keep it out of 5&6 longer?

Reading up on the H&S Overdrive program, they give you the ability to push 5&6 further out. I just hate spending money on gadgets that are not necessary. I will spend money for good tools that improve longevity and durability. Maybe the H&S Overdrive is better than I think.

I bought the BD stuff only because I know that cooler tranny oil is better and that higher band pressure will prevent slippage especially under a load like hay.

Long thread, sorry. Just curious what everyone else is doing.
 

Last edited by jpthomso; Jun 22, 2011 at 04:28 PM.
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Old Jun 23, 2011 | 09:25 PM
  #2  
08 mega man's Avatar
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From: bluejacket ok
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If you don't wanna throw down the cash for the overdribe you could get a sonnax line psi booster it will do almost as much as the h&s but cheaper fix but eventually you will have to upgrade or if your willing to put down some extra cash the ats co-pilot I've heard nothing but good wbout
 
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Old Jun 24, 2011 | 02:17 PM
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barkrulz's Avatar
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From: Florabama, PCB
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if your only doing 1000 miles a year you could also just us the shift button and drag 4th to 5th out longer and 5th to 6th out longer.
 
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Old Aug 2, 2011 | 02:41 PM
  #4  
ltr450's Avatar
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From: Elimsport, PA
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i was wondering the same thing how are these tranny for towing i haul hay and other big loads. i was looking into getting an auto but i read a lot or tranny issues with these new trucks. mybe i will just get a manual trans. and put a dual dics. or just keep my 12v till the wheels fall off.
 
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Old Aug 27, 2011 | 01:32 PM
  #5  
ICSO9131's Avatar
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From: Wyoming
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If you are leaving your truck stock the 68RFE should last you around 180k if you keep on top of fluid changes.

The failures you're hearing about is from people racing with 500HP engines running the stock transmission engineered to handle 350HP.

If you reduce the HP by 30HP ~10% you have just shortened your transmission life by 50% (Coming from the engineer that designed and builds them).

Only thing you can do is drop in a transmission built to handle the extra ponies.
 
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