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Discussion Starter · #1 ·
I have only had my Ram for a short while. It goes fine but the 3:55 axles gears seem a little tall on the highway. Anyone running 4:10 and a 5 speed? Thoughts on the combo?


I stumbled upon a diesel owner with the same axle combo with 4:10s that might want to do a straight swap.

I probably won't go bigger on the tires for at least a little while. I'm very familiar with axle ratio swaps and have done many in Jeep axles. Just curious on driving impressions with the V10 as I'm still getting familiar with it.
 

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Torque monster gas hog (but underpowered for anything but towing) in stock form. Lots of potential to be had, but not much in the way of speed parts, especially since the truck and Viper engine parts aren't interchangeable.
 

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Discussion Starter · #3 · (Edited)
I bought it as a wheel barrow and maybe a fun Expedition build truck.

Want to keep the ultimate functionality with it. (not going to run 37s on this one.....)


No overly concerned with the power. I tows fine like it is(had 10,500lbs behind it a few weeks ago) Already has headers, full dual exhaust, MSD wires, etc.....and honestly it's the least powerful thing I own. If I want to go fast I'll simply take one of the other vehicles.

Just don't want to do the swap and feel like I'm spinning too high on the highway all the time. Since I have not driven it that much I'm just not sure how an extra 400 rpm would feel at highway speed on the V10
 

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It would feel like a kick in the wallet. You already get about what, 14 hwy? on a good day? with 4:10's that would drop to around 11. Towing would get easier, acceleration would be better, but without running bigger tires, there really isnt a need.


Wow...3:55 is really tall for that truck. Might I suggest a 3:73 or 3:92?
 

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I am original owner of a 1995 std cab with that very set up (4:10 5spd V10) but most of my seat time was spent on 33x12.5’s which are slightly taller than your 285's. On 33's I got ~10mpg unladen and ~ 8mpg towing but I loved how it drove. It never felt tortured at fwy speeds and as for the characterization that it’s gutless, I couldn’t disagree more. I totally spanked my buddy in his heavily tuned 5.9L CTD in straight line acceleration. His CTD had 3.50's or 3.70’s in the diff's but still, he couldn’t believe it! He was sorely disappointed. Anyway, I don’t think you’ll regret the change, and if you feel you’re a little short just go up to 33’s or 35’s, but it has never felt too stretched to me.
 

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Im not understanding why people say the v10 is underpowered...my 01 quadcab has 80k on it with an automatic and 265-75-16s and has plenty of power...hell, it cuts out sideways at 30-35 miles an hour on dry tar... I guess I got lucky. Oh, and if your worried about gas mileage, buy a v6....
 

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Discussion Starter · #7 ·
Thanks for the input guys! Keep it coming.


Fuel mileage is not a huge concern. The truck is a 9th vehicle for the 2 of us:4-dontknow:

Always liked these trucks and needed one to do truck things with. But not really a daily driver thing. (though I have been driving it a lot and enjoying it)
 

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I have the 5 speed with the 4.10 gears in the differential, ran 285's for the past year. It runs 60 mph at 2000 rpm, so your highway overdrive is gone with that setup. The engine makes 450lb of torque at 2800 rpm, the curve starts a little over idle, and it pulls all the way up. I get about 10 mpg, I personally would be much happier if the Highway speed was running about 1300-1500 rpms. It's an over drive gear it should drive like one. The truck will pull in 5th without downshifting all the way down to 25mph. I'm going to go with bigger tires in the future, somewhere between a 35 or 38. if I need a creeper gear, it's got a wicked 1st gear, and if I really need it there's always 4 low. Hope this helps.
 

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I ran 33's the whole life of the truck (~80k miles) and I just went up to 37's and now I'm really wanting more power. My engine is bone stock and it now struggles to maintain highway speed in 5th on even modest grades unladen where it had no trouble on 33's (mine is the lighter std cab, not the extended cab). So 35's are the max I'd personally go w/out engine mods on 4.10 gears based on what I'm now getting although it's possible my cats are plugged so next wk I'm getting relieved exhaust (Magnaflow cats + flowmaster muffler) and I'll post an update once I see how that does. After that I'm going straight to a massaged throttle body and cold air intake, then 1.7:1 roller rockers if I need it but I wouldn't trade the 37's for anything so I may ultimately go to 4.56 or 4.88 gears depending on how much difference the engine mods make.
 

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Not exactly sure. I'll take some exact readings on my way to the muffler shop next wkend and post on both rpm's and what the exhaust did for me.

Off topic but I love my IROK 37's. I was able to navigate 1 ft of snow at 30psi with ease, so no more airing down and back up as I traverse the snow line on my way to work. The only problem was that I needed goggles to run with the window down :D
 

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Jury's in: I don't think it was the cat's. As it stands with the 37's it runs best when I keep it ~ 2000rpm. Much lower and it labors to accelerate in 4th and 5th.

I ended up w/ magnaflow cat's (P/N 39006) and a double-in, single-out magnaflow big block muffler w/ a 3" madrel-bent exit pipe routed over the axle, behind the pass-side rear tire. I don't want the hassles that come with headers so I stuck w/ the OEM 2.25" pipes to the cats. The cats themselves are 2.5" in & out. My butt dyno says maybe 5% gain, maybe, but there is a noticeable gain in throttle response and torque coming off idle, making it easier on the clutch coming off a stop, but harder on the tires ;) Note: Here in California we are forced to run cat’s or I would’ve ditched them long ago. Engine note is throaty but barely louder than stock and most importantly, no drone!

Re: rpm’s – I’m hitting 50mph at 1600rpm and at 65mph I’m turning 1900rpm in 5th gear. My spedo is reading 55mph when I'm actually doing 65mph so when I think back to how it ran before I think it's just a matter of running out of hp necessary to overcome the added wind drag of the higher profile stance, plus overcoming the increased mass & inertia of the bigger tires.

I’m hoping my fastman throttle body and cold air intake will make good use of these exhaust mod’s to give me more muscle to turn these tires. I’ll likely post a new thread summarizing the combined results when I finish the whole setup.
 

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Thanks for the info on the rpm's I have finally used my to tow with and it pulls like a train, 7k down the highway, like it was empty. if it weren't for stopping I wouldn't have known I had a load. Then I also got to use in in some mud, it's ok there, not enough rpm for me, just ran out of gear real fast. Might change my mind and go with a 35/36" inch tire then.
 

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Gunfighter,
You said earlier you were running 285's but listed no second or 3rd #'s so assuming you're currently running 285/75/16's, then the 35's would put you ~10% lower in rpm from where you are now. Any more than that and I think you might be disappointed in the towing performance pulling a 7k lb load. I'm 18% lower in rpm from my 33's and wouldn't be at all happy towing this way. You can always run the mud a gear taller if you're short without topping out (unless you're goin' bonzai!) but being too tall towing puts too much spacing between gears resulting in more frequent up/down shifts, adding to fatigue on long distance tirps which could leave you wrung out once you arrive at your fun spots, to say nothing of the wear and tear on your clutch and drivetrain. Just my humble opinion.

FWIW, I'm contemplating going to 4.88:1 gears after doing the math. This will get me back to where I was w/ the 33's, and in fact I may go one step lower (5.38's I think) depending on how the throttle body and cold air intake do. But this is my ranch truck so my days of running significant highway miles are over.
 

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I just put a set of 4.56 in my pickup and so far love it. My acceleration has improved immensely and I have been able to keep a consistent speed on the highway with out having to shift down every time a hill comes up. Going at about 75 my rpm's are about 2500 but thats with 35 inch tires.
 

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Update: I finally caught a break in the weather so put my tuned throttle body on and it runs much better now, however in the process I found a rats nest up against the air filter, blocking the flow! Several months ago I had a rogue rat that ate thru some wiring on my other car and I caught it in a trap so thought my problems were over but I guess he had been into my V10 engine as well. Anyway, it runs much better so the motivation to go to lower gears ins't as urgent now. I still need to install the K&N cold air kit but the hang up has been the customization necessary to get it to clear the aux battery. Hope to complete this upgrade in a couple wks after which I'll reassess the whole performance issue. I'll post again after that.
 

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Update II: I said I'd post again after the cold air intake is installed so here it is.

It runs pretty well now. I'm actually pretty pleased with the improvement. It's still not as quick as it used to be on the 33's but it's actually pretty close now on 37's so for now at lesat I'm inclined to stay with the 4.10's. I'd go to 4.88's if I go up in tire size again (beyond 37's) but for now I'm staying pat.
 

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Thanks for the update on your truck, sorry to hear about the rats nest. I'm working on getting a set of 37"s. Can't wait!
Update II: I said I'd post again after the cold air intake is installed so here it is.

It runs pretty well now. I'm actually pretty pleased with the improvement. It's still not as quick as it used to be on the 33's but it's actually pretty close now on 37's so for now at lesat I'm inclined to stay with the 4.10's. I'd go to 4.88's if I go up in tire size again (beyond 37's) but for now I'm staying pat.

Any new updates??? Enjoyed reading this thread...
 
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