Is 68RFE limiting tow capacity? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 02-12-2007, 10:10 PM Thread Starter
 
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Is 68RFE limiting tow capacity?

I have been expecting Dodge to increase the tow rating on the new powertrain. In the old brochure they spec the 5.9/manual/3.73 at 15,400, but the 5.9/4sp/3.73 at 13,500. So with all of the lower gears on the 68RFE, I expected it to jump in line with the 4.10.

Well I just got a new brochure, and it says 6.7/6 spd/3.73 at 13,400, a loss of 100! But the 4.10 will get it back up to 15,400. Dodge is the only maker with a 3.73 towing so little. Surely the 6.7 can't be the problem. So does this mean that the 68RFE is a lot weaker than they have been marketing?

The 68RFE has lower gears in 1st, 2nd and 5th than the Allison. And on a GMC/Chevy there is no penalty for 3.73 like this.

I was getting ready to order a truck. Now I don't know. I really do not want to order 4.10 gears.
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post #2 of 6 (permalink) Old 02-12-2007, 10:35 PM
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If you are going to be towing, and towing heavy, get the 4.10's. They will not compromise mpg as much as some would have you believe. If I get another Dodge instead of a Ford, I will get the 4.10's auto and go with 285 or 295/70 17 tires.
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post #3 of 6 (permalink) Old 02-14-2007, 10:04 PM
 
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4.10's are the only way to go. Put bigger tires to bring down rpm's. If you need to tow something heavy put the stockers back on and your set.
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post #4 of 6 (permalink) Old 02-15-2007, 01:18 PM
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If you get the 4.10 and put larger tires on it is the same as getting the 3.73 with the stock tires. the two trucks will tow almost the same. With larger tires you loose the towing advantage you gained with the 4.10. Now don't get me wrong. The truck will tow a 15k trailer with the 4.10 and the 3.73 with no problems.

:bow: 2005 Ford F-350 CC 4x4 Dually. Of course :agreed: 6.0 PSD with Torqueshift Tranny.
Big Black Beast. :evil:
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post #5 of 6 (permalink) Old 02-28-2007, 01:34 AM
 
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from what i have read about the new tranny, it has two over drives and the highest one is .6??? to 1, this is much higher than any other i have seen, meaning a person that tows a lot, could get the 4.10s, use the gear selector option and stay in 5th, which would be like the "dork-shift" and then when empty the tranny should easily go into 6th gear giving the near effect of 3.73 or maybe even better. i am wrong on this?? i am anxously waiting to se and drive one when they finally get here to test this. if this tranny does this as i described, then this is the only reason to get an auto, IMO.
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post #6 of 6 (permalink) Old 02-28-2007, 03:37 PM Thread Starter
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I drove a CC with no bed which is geared a lot lower, and it was not as sluggish as I expected. I didn't get on it in order to try and judge the lower weight. Never got it over 2000 rpm. The 68RFE with 3.73 is a lot higher gear. It should do just fine.

Including tires in the calculation, the 68RFE/3.73 is geared slightly higher than the Allison/Chevy/GMC, except for 5th. The 5th gear is actually somewhat low, so it must be intended for hauling in that gear and to extend range before downshifting into 4th. Or looking at it differently, when empty, it should upshift into 6th earlier.

Anway, I'm putting in my order today.
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