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Early Ram 6.4 review

Old 05-15-2020, 07:11 PM
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Default Early Ram 6.4 review

2500, CC, short bed 4wd.Tomorrow will be three weeks. 1800 miles as of today. Almost all in town or country roads, as you can see by the 35mph avg. Havenít hooked it up yet, and I stay out of it unless I am. Hand math said 15.2, 15.6, and 16.2 on the last fill up. Nothing not to like about it yet, but itís early. Knock on wood.



Last edited by REMfish7; 05-15-2020 at 07:36 PM.
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Old 05-16-2020, 01:02 PM
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I just got rid of my lemon 2018 Ram 2500 with the 6.4 and 6 speed transmission and 4.10 gears and picked up a new 2019 2500 mega cab with the 6.4 and 8 speed and 3.73 gears. So far I'm only getting 13 mpg but I only have around 360 miles. I'm hoping it gets better. I'm already regretting not getting the 4.10 rear end again. I shouldn't have listened to the salesman on that.
Old 05-16-2020, 01:29 PM
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Yeah, I have 3.73 and eight speed. I liked the 48re/ Cummins package in my 04, but this is night and day difference with the miles I drive and rarely towing over 6k.
Old 05-16-2020, 01:42 PM
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The 6.4L with the 8 speed and 3.73 doesnt pull well?? Just curious what the actual difference is in performance..

Old 05-16-2020, 01:53 PM
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I haven't actually tried pulling with it yet. I'm hoping it won't be an issue and I'm just over thinking it but on the Ram forums if it's not the 4.10 it's crap. When I pulled my boat out to Oregon last September I was only getting around 5-6 mpg. I never once lacked for power so when I was looking to buy again I thought the 3.73 shouldn't really be an issue. I hope I'm right. The dealer told me that if I went with the 3.73 my normal mpg should be in the 17-18 range for normal driving where my old truck the best I ever averaged was 13.5. I've got to pull my boat over the mountain to my mechanic this next week, (it's a 9% grade for 10 miles to the summit) I'll report back on the performance.
Old 05-17-2020, 05:01 PM
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I find the 3.73s to be adequate although Iím hauling my boat around relatively flat terrain. I figure loaded Iím in the 7500-8000 pound range. Fuel economy is dismal though. Like single digits dismal. Unloaded at 72 Iím averaging 16.8 though, everything is a compromise I guess
Old 06-24-2020, 09:56 PM
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Pulled a 10,000# boat to Salt Lake today and averaged 7.9 mpg. My 2018 averaged around 4.5 to 5 so substantially better. It didn't seem to lack for power without the 4.10 rear end. I'm still only averaging around 13.5 without a trailer though.
Old 06-25-2020, 08:09 AM
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The 66rfe has a 3.23, 1.84, 1.41, 1.0, .82, .62 gear ratio. The 8 speed is 4.71, 3.14, 2.10, 1.67, 1.29, 1, .84, .67. The difference pulling with 3.73 to 4.10 will be negligible. With the 6 speed the spread was soo much further that's where the need for 4.10 or lower gears came from.
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Old 06-25-2020, 08:13 AM
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Originally Posted by Twahl View Post
Pulled a 10,000# boat to Salt Lake today and averaged 7.9 mpg. My 2018 averaged around 4.5 to 5 so substantially better. It didn't seem to lack for power without the 4.10 rear end. I'm still only averaging around 13.5 without a trailer though.
At what speed?
Old 06-25-2020, 08:30 AM
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Mostly between 65 and 70 with a few bursts up to 85 to pass traffic.
Old 06-25-2020, 08:33 AM
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That's better than my ram 1500 with 5.7. I am getting about 13 on that thing.
Old 06-25-2020, 10:31 AM
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My v6 Colorado gets 16-18mpg so not bad.
Old 06-27-2020, 04:50 AM
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Originally Posted by Rubbermade View Post
My v6 Colorado gets 16-18mpg so not bad.
Seems like a reasonable comparison to a Hemi 6.4 in an HD Ram.
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Old 06-27-2020, 05:41 AM
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I had the same setup with motor and transmission. I hope your tranny lasts longer than mine did. 94K and it did a total grenade. Had it rebuilt and sold in a week. Now Im in a 2020 F250 with the 7.3 gas motor and 10 speed transmission. I will never drive anything else. Its that good.
Old 06-27-2020, 05:54 AM
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Originally Posted by Budroe View Post
I had the same setup with motor and transmission. I hope your tranny lasts longer than mine did. 94K and it did a total grenade. Had it rebuilt and sold in a week. Now Im in a 2020 F250 with the 7.3 gas motor and 10 speed transmission. I will never drive anything else. Its that good.
You put 94k on an HD Ram with a 6.4/8 speed combo? Thatís a ton of driving consider it just came out in 2019
Old 06-27-2020, 06:29 AM
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Originally Posted by andyp262 View Post
You put 94k on an HD Ram with a 6.4/8 speed combo? That’s a ton of driving consider it just came out in 2019
Sorry. 2018. I forgot to point out that differentiator. 1200K per week doing equipment sales.
Old 06-27-2020, 06:42 AM
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Originally Posted by Budroe View Post
Sorry. 2018. I forgot to point out that differentiator. 1200K per week doing equipment sales.
That is a lot of driving for sure. Hopefully you have better luck with the Ford
Old 06-27-2020, 10:31 AM
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Originally Posted by Budroe View Post
I had the same setup with motor and transmission. I hope your tranny lasts longer than mine did. 94K and it did a total grenade. Had it rebuilt and sold in a week. Now Im in a 2020 F250 with the 7.3 gas motor and 10 speed transmission. I will never drive anything else. Its that good.
So as someone already asked out how did you put 94k miles on a truck when it just came out in 2019?
Old 06-27-2020, 11:55 PM
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Originally Posted by IcutMetl View Post
Seems like a reasonable comparison to a Hemi 6.4 in an HD Ram.
Considering I'm in a significantly lighter truck, with a small 3.6l engine, getting only 1-2mpg more on average, I'd say the Ram is doing really good.

Last edited by Rubbermade; 06-28-2020 at 04:23 AM.
Old 06-28-2020, 02:45 AM
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Same truck here also. I switched from 2015 RAM 2500 Cummins to 2020 RAM 2500 Gasser.
I would echo the MPG numbers you guys report.
Although I miss the hauling performance of my diesel, it is nice to no longer worry about being on the roadside in limp mode hooked up to 8,500 pounds.


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