6.4 hemi, 4.56 gears, speed and RPM's

14RAM4X4 · Jan 9, 2018

Subscribed! This is on my list.... but saving the coin for it is KILLING me! About 1/3 the way there and all these damn nice rifles are coming up for sale in my area !!!

RoadRamblerNJ · Jan 10, 2018

14RAM4X4 said:
Subscribed! This is on my list.... but saving the coin for it is KILLING me! About 1/3 the way there and all these damn nice rifles are coming up for sale in my area !!!

Damn guns are worse than trucks. $$$ just flies out of my wallet.

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theviking · Jan 10, 2018

With the Dems back in charge of NJ you may not have to worry about spending $$$ on guns for much longer....

http://www.nj.com/politics/index.ssf/2017/10/here_are_some_of_the_gun_control_measures_murphy_w.html

RoadRamblerNJ · Jan 12, 2018

theviking said:
With the Dems back in charge of NJ you may not have to worry about spending $$$ on guns for much longer....

http://www.nj.com/politics/index.ssf/2017/10/here_are_some_of_the_gun_control_measures_murphy_w.html

Oh, mine are already bought. That $$$ flying out was in the past. Now just trying to figure out if I like TN or VA better. I'm thinkin' TN. I do not belong here.

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jaflowers · Jan 17, 2018

RoadRamblerNJ said:
Damn guns are worse than trucks. $$$ just flies out of my wallet.

Not 1st, 2nd or 3rd? No Trophy!

Been seriously thinking of doing the gears too but I'm a gun guy too. Bought a rifle late last year that would have covered the gear change and then some. Nice toys are expensive.

68PowerWagon · Jan 17, 2018

Guys... guys! You are all looking at this wrong! Both are NOT toys & they both are justifiable. Buying big guns & big trucks is simply preparing for the zombie apocalypse! :laughing1:

RoadRamblerNJ · Jan 17, 2018

jaflowers said:
Been seriously thinking of doing the gears too but I'm a gun guy too. Bought a rifle late last year that would have covered the gear change and then some. Nice toys are expensive.

Must be a helluva rifle.

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RoadRamblerNJ · Jan 17, 2018

68PowerWagon said:
Guys... guys! You are all looking at this wrong! Both are NOT toys & they both are justifiable. Buying big guns & big trucks is simply preparing for the zombie apocalypse!

Love that '68 Power Wagon. Got some real pics?

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RoadRamblerNJ · Jan 20, 2018

[email protected] said:
Your killing me. I'm going to talk to the shop doing it and see what he thinks now you got me seriously considering the 4.88. Thank all you guys for the input and help it is very appreciated. I'm going to the shop on Monday to have them order the parts I'll keep you guys posted.

Ok, we hijacked your thread from rears & gears to rifles. Lets get back to OP's dillema. Did you decide/get your gears yet? If so, which ratio?

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brandonc1884@gmail.com · Jan 20, 2018

I went with 4.56 lmao. Go ahead lay into me. Haven't got them installed yet either this week or next week I'll let u know

brandonc1884@gmail.com · Jan 20, 2018

And I spend money on guns lol

RoadRamblerNJ · Jan 21, 2018

[email protected] said:
I went with 4.56 lmao. Go ahead lay into me. Haven't got them installed yet either this week or next week I'll let u know

I can't say sht. I have 4.10's. I also don't have anything to tow yet and I go 90 miles a day to/from work, about 1/2 highway. When I retire & get a trailer I'll put the 5.13's in. Wheelie city then.

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68PowerWagon · Jan 22, 2018

[email protected] said:
I went with 4.56 lmao. Go ahead lay into me. Haven't got them installed yet either this week or next week I'll let u know

I will be interested in what kind of fuel mileage you will get & what your rpm's are at 65mph. And of coarse will want to know how much more tug power you have.

tuffy · Jan 26, 2018

I can't wait to hear how you like the 4.56 but in My case I am staying with the stock 33's and I am debating on 4.56 or 4.88 for towing a 12k# trailer, I absolutely HATE the 3.73's

brandonc1884@gmail.com · Jan 26, 2018

I drop it off Monday. I'll keep you guys up dated have to baby it for the first 500 miles or so for break in. Then i will be able to tell how much of a difference it will make.

RoadRamblerNJ · Jan 26, 2018

tuffy said:
I can't wait to hear how you like the 4.56 but in My case I am staying with the stock 33's and I am debating on 4.56 or 4.88 for towing a 12k# trailer, I absolutely HATE the 3.73's

Tuffy, I did a little math. Remember, You HATE 3.73:1. The jump from 3.73s to 4.56s is approx 22.3 %. The jump from 3.73s to 4.88s is approx 30.9 %. The difference btwn the two is roughly 8.6 %. Only you would know how you drive and how often you tow. Hills? Just thought this would help.

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tuffy · Jan 27, 2018

Here is a little comparison chart I made, don't look at the first and second gear so much I know this thing won't do 12000 RPM i am just too lazy to take that out.
Anyway with my '16, 6.4L, 3.73 diff and stock 18" wheels/tires when I am pulling my 12,000# trailer I have a hell of a time staying in 4th gear (2400- 2600 rpm) any wind or slight hill at 65 to 70 mph and I am screaming along in 3rd gear and dropping into 2nd on hills.
So to me it looks like if I went from 3.73 to 4.56 I would have the same problem in that 2400 to 2600 rpm range just in 5th not 4th. of course 4th gear would be higher RPM around 3000 which it should stay in.
4.88 on the other hand would be 2600 to 2800 rpm in 5th and might be enough of a bump to keep it there. The downfall of course is unloaded going 80 down the highway. the difference is only 160 rpm's though between the 4.56 and 4.88.
Anyone have 4.88's that has any real-world data loaded and unloaded?

So I am leaning towards 4.88 but haven't quite pulled the trigger yet.
Any advice would be greatly appreciated.
Hope this chart helps those of you that are in the same situation I am.

RainDesert · Jan 27, 2018

Keep in mind, by going to a 4.56 you are gaining a significant leverage advantage that might be enough to use a lot more 5th. That's exactly how it went for me going from 3.73 to 4.30 in my 6.2.

RoadRamblerNJ · Jan 27, 2018

tuffy said:
Here is a little comparison chart I made, don't look at the first and second gear so much I know this thing won't do 12000 RPM i am just too lazy to take that out.
Anyway with my '16, 6.4L, 3.73 diff and stock 18" wheels/tires when I am pulling my 12,000# trailer I have a hell of a time staying in 4th gear (2400- 2600 rpm) any wind or slight hill at 65 to 70 mph and I am screaming along in 3rd gear and dropping into 2nd on hills.
So to me it looks like if I went from 3.73 to 4.56 I would have the same problem in that 2400 to 2600 rpm range just in 5th not 4th. of course 4th gear would be higher RPM around 3000 which it should stay in.
4.88 on the other hand would be 2600 to 2800 rpm in 5th and might be enough of a bump to keep it there. The downfall of course is unloaded going 80 down the highway. the difference is only 160 rpm's though between the 4.56 and 4.88.
Anyone have 4.88's that has any real-world data loaded and unloaded?

So I am leaning towards 4.88 but haven't quite pulled the trigger yet.
Any advice would be greatly appreciated.
Hope this chart helps those of you that are in the same situation I am.

View attachment 118944

For what it's worth, when I save up the $$, I am going with 5.13s, but I'm a little nuts that way. I've always been a short gear fan. Ever since I put a 72 tooth back sprocket on my 1972 Hodaka Ace 100 dirt bike. Stock was like 48T. Haha

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RoadRamblerNJ · Jan 27, 2018

Also, I'm Ret. LEO. I've been to 2 really nasty truck/trailer flip overs. REALLY NASTY. Once you see that, you will never tow 12k lbs at stupid speeds ever again. Short gears kinda act like a watch dog.

Not 1st, 2nd or 3rd? No Trophy!

6.4 hemi, 4.56 gears, speed and RPM's

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