Aisin vs 68RFE - Dodge Cummins Diesel Forum
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post #1 of 39 (permalink) Old 10-18-2015, 12:52 PM Thread Starter
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Aisin vs 68RFE

I looking at used trucks 2013 or 2014 3500 4x4 duallys I can't find many trucks with the Aisin but I find a lot withe 68RFE, I do not pull heavy loads often but when I do it about 15 to 22k 4 or 5 times a month less than 500 miles. Will the 68rfe a good trans or should I hold out for the Aisin thanks.

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post #2 of 39 (permalink) Old 10-18-2015, 01:48 PM
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I'd wait for the Aisin.

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post #3 of 39 (permalink) Old 10-20-2015, 01:59 PM
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Quote:
Originally Posted by bugsy57 View Post
I do not pull heavy loads often
but when I do it about 15 to 22k 4 or 5 times a month less than 500 miles.
Wait, what?
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post #4 of 39 (permalink) Old 11-04-2015, 12:39 PM
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I have the Aisin, and to be honest the reason why I ordered it was because of the extra cooling it has, and the smoothness of the shifts. Keep in mind an Aisin seems more harsh at first, but its because it learns you driving style.
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post #5 of 39 (permalink) Old 11-04-2015, 04:29 PM
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Originally Posted by bugsy57 View Post
15 to 22k 4 or 5 times a month less than 500 miles.
22,000 lbs is the absolute top limit of the 68RFE with the 4.10 gears. Having the Aisin transmission and the 3.73 or 4.10 gears gives you much more towing power.

If it was me, I would spend a couple dollars more and get the Aisin with another 7000 lbs of towing capability and cushion.
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post #6 of 39 (permalink) Old 11-05-2015, 12:17 AM
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Quote:
Originally Posted by bugsy57 View Post
I looking at used trucks 2013 or 2014 3500 4x4 duallys I can't find many trucks with the Aisin but I find a lot withe 68RFE, I do not pull heavy loads often but when I do it about 15 to 22k 4 or 5 times a month less than 500 miles. Will the 68rfe a good trans or should I hold out for the Aisin thanks.
I have zero regrets having chosen the Aisin. The mate with the HO 6.7 makes it pull like a dream. I'm generally around 23,000 GCVW and it will pull a 6% grade at 55 MPH like it was effortless. Even empty I like the shift logic.

All that said it appears that the 68RFE is a very good transmission as well.

2014 4x4 SRW 3500 6.7 CTD, Aisin, 37' Toyhauler
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post #7 of 39 (permalink) Old 11-05-2015, 12:39 AM
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Wait, what?
that's funny.

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post #8 of 39 (permalink) Old 11-05-2015, 02:11 PM
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22,000 lbs is the absolute top limit of the 68RFE with the 4.10 gears. Having the Aisin transmission and the 3.73 or 4.10 gears gives you much more towing power.
I just want to point this out....because I see these kinds of statements a lot......but the Aisin does not give you any power. It is a transmission.

It is a stronger transmission, able to handle larger loads, and more torque input, but it is not providing that power.
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post #9 of 39 (permalink) Old 11-05-2015, 02:20 PM
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I just want to point this out....because I see these kinds of statements a lot......but the Aisin does not give you any power. It is a transmission.

It is a stronger transmission, able to handle larger loads, and more torque input, but it is not providing that power.
In 2014 when I bought mine you got a higher Horsepower and Torque tune with the Aisin. I think it was 370/800 with the 68RFE and 385/865 with the Aisin transmission. That's history now, but at the time Dodge gave you more power with this transmission even though it's not the transmission making the power.

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post #10 of 39 (permalink) Old 11-05-2015, 03:14 PM
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I just want to point this out....because I see these kinds of statements a lot......but the Aisin does not give you any power. It is a transmission.

It is a stronger transmission, able to handle larger loads, and more torque input, but it is not providing that power.
I believe the point was that if you get the Aisin, you also get the high output version of the Cummins. Which everyone knows the following:

68rfe - 370hp 800lb/ft
Aisin - 385hp 900lb/ft (865lb/ft in 2015 and 850lb/ft in 2014)
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post #11 of 39 (permalink) Old 11-05-2015, 04:14 PM
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Ok, good, y'all understand!

I just see a lot of talk (here and elsewhere) that sounds like people are crediting the Aisin for more power.....when it is indeed the HO engine and moreso the lower gear ratio that usually comes with an Aisin.

A typical example would be a discussion of 68 RFE vs Aisin. One guy says he used to have a 68RFE with 3.42's and now has an Aisin with 4.10's (no mention of the HO Cummins). Then goes on to explain how much better it tows yada yada yada and then gives credit to the Aisin, when really, it has nothing to do with the Aisin. I see this type of thing a lot, I now find myself compelled to say something.

See something...say something
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post #12 of 39 (permalink) Old 11-05-2015, 04:19 PM
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The Aisin has a double-down gear and a slip-stall converter that, along with higher internal rotating mass, equates to more power.

The engine tune is, in fact, the same, the extra 15hp and ~50ft-lbs is a direct result of centrifugal force inside the transmission, in addition to superior fluid dynamics and titanium-brazing in the converter, thereby sending more power to the rear wheels.

Pretty technical stuff...

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