My brother has a 03 HEMI Ram 1500 RCSB 2wd. He has 3.92 gears in it right now, but wants to swap in 4.56s. I think these are too low for daily driving, but he says that with his tire size (smaller than stock) he'll be at 2600 rpm at 75 mph.

What do you guys think?

What size tire is he running? There are tons of dakota guys using 4.56 gears with 27-28" tall tires and they work very well. Tho with 28" tires they are turning 2850 @ 75mph. With a ram he likely has at least 31" and be running between 25-2600 @ 75, not bad at all IMO.

I think its 255/55/18.

that won't be too bad

Thanks man. He ordered them, so we'll see how they do.

How do your trucks stack up now?

How do your trucks stack up now?

We've never actually lined them up, but when they were both stock and new I'd say they were pretty even. As he put more miles on it definately got stronger. With all my mods I'm faster than him now.

Now he has a Borla catback, Dynatech longtubes, and a K&N FIPK. Plus these gears and a HPP3 to correct his speedo on the way.

Sometime when TTPerformance has a dyno day we're going to strap them down and see how they stack up.

What an interesting test it would be to line them up now and again after the gear change.MY guess would be he would pull harder 0-70 and you would pull away harder than before after that.I am not a believer in 4:56 in light 2wheel drives.4x4 with 35" yes .The lower gears feel snappier but its a placebo effect when it comes to the 1/4 mile.


BTW
If you had a stall you'd be dialed

What an interesting test it would be to line them up now and again after the gear change.MY guess would be he would pull harder 0-70 and you would pull away harder than before after that.I am not a believer in 4:56 in light 2wheel drives.4x4 with 35" yes .The lower gears feel snappier but its a placebo effect when it comes to the 1/4 mile.


BTW
If you had a stall you'd be dialed


I agree 100%, seen it many times, good off the line but what you gain down low you will lose in the upper end of the 1/4, and it basically isn't an improvement at all, unless you like street racing from stop light to light.

BTW
If you had a stall you'd be dialed

Boy don't I know it. I just can't decide which to use.

4.56 gears are awesome! Especially with a high stall converter!!! DIZAM!!!!

If awesome means snappy and easily roast'em OK. Quickest hemi SWB have what gears? H777 and density others?

Depends on what rpm your motor turns and tire height as well. If your going to spin 7k and the truck pulls strong up to that point you would be at an advantage giving the truck the strongest mechanical advantage possible.

You really think a truck with 3.55's is going to run the same 1/4 time as one with 4.56?? Your completely out of your mind. Only situation where that would be true is if the truck was running out of gear in the 1/4 which is HIGHLY unlikely.

28" tire (pretty average)
4.56 gears
1:1 3rd gear tranny ratio.
110mph is only turning 6000rpm

Last I checked most trucks that will run 110 have nooooo problem spinning 6k.

Yes it's all dependant on your setup and some motors like to lug lower gears, but with the tire height most rams are running 4.56 are great.

in a 1/4 mile 3.90s will spin less out of the hole and pull harder on top in a RCSB 2x4.It will stay in the torque curve longer.

I agree with ShaknBak my 4.56's are in my top 5 mods. I gained 2/10 in the 1/8 and right at 4/10 in the 1/4. It pulls great all the way through and that's with the 22's.

Do you think H777 would have been .4 quicker over his best N/A times?I bet he would say no.

I didnt say my times were na and I'm not comparing to anyones times but my own.

Hate to tell ya gonz but your wrong in this instance. 4.56 gears are great for 1/4 times as have been proven by numerous hemi rams, 5.9 dakotas, SRT-10's etc. Heck the QC SRT-10 comes with them stock... go figure. If your a lead foot and don't know how to launch then yes you'll smoke them easier, but as for staying in the torque curve, pffft. Last I checked most trucks run much better if you let them pull through the lights at more than 4200rpm.

Not all will drop .4 in the 1/4 but thats a very common number for mildly modified setups. Yes some that make monster power won't see a gain b/c they have the power to pull huge gears to redline anyway.

Whos this 777 guy you seem to be :hump: what are his mods? what does his truck run?

It's a hemi, not a cummins, they don't like to be lugged with tall gears at all.

777 runs 3:92s in the old truck and I assume thats what he is running now. Seems all the dodge sites are having controversy over the gear swap, so I'll add my experience with them. A few guys I know have done them, one being Hemifever and another being Rampant, the only two that I personally know myself, but others on the different sites have swapped as well. Hemifever got very little gains with his swap, like around a tenth, but he feels as if gave him some more power to spin the heavy 22s he is running a little better than the 3:92s. Rampant, now I was directly involved with his swap, but running the truck after the swap to 4:56s from the 3:92s yeilded about 2 one hundredths of a second gain, which is less than a tenth, test were done the same week, same track, so the conditions were about equal. So I say, its a waste of money if you are expecting a big gain in the 1/4 mile. Now, off the line and thru the 1/8 there was increases that were noticable, but who in their right mind wants to stop at the 1/8 when you have the 1/4. But for street racers or ricers, how ever ya wanna look at it, it might be worth it from light to light. I would spend my money on a programmer or a NOS kit before I went to do gear changes myself, but thats my opinion, and you know the old saying, everybody has one, some have two.

in a 1/4 mile 3.90s will spin less out of the hole and pull harder on top in a RCSB 2x4.It will stay in the torque curve longer.


Gonzo, that is my exact findings as well. 4:56s had a better hole shot and gained in the 1/8 but died flat after the 1/8, you guys need to run a before and after at the same track and about the same conditions, or as close as possible.

Depends on what rpm your motor turns and tire height as well. If your going to spin 7k and the truck pulls strong up to that point you would be at an advantage giving the truck the strongest mechanical advantage possible.

You really think a truck with 3.55's is going to run the same 1/4 time as one with 4.56?? Your completely out of your mind. Only situation where that would be true is if the truck was running out of gear in the 1/4 which is HIGHLY unlikely.

28" tire (pretty average)
4.56 gears
1:1 3rd gear tranny ratio.
110mph is only turning 6000rpm

Last I checked most trucks that will run 110 have nooooo problem spinning 6k.

Yes it's all dependant on your setup and some motors like to lug lower gears, but with the tire height most rams are running 4.56 are great.


It might work that way with the dakotas, but you are so far off with the new gen hemi powered rams its funny, not trying to flame here but I haven't seen a 2003 and up ram turn 7,000 rpms yet, not even really 6,000, you can get close with a programmer, but not many of these guys are running one. Average tire size is about 30.5 inches on the rams running here with factory 20s.

Hate to tell ya gonz but your wrong in this instance. 4.56 gears are great for 1/4 times as have been proven by numerous hemi rams, 5.9 dakotas, SRT-10's etc. Heck the QC SRT-10 comes with them stock... go figure. If your a lead foot and don't know how to launch then yes you'll smoke them easier, but as for staying in the torque curve, pffft. Last I checked most trucks run much better if you let them pull through the lights at more than 4200rpm.

Not all will drop .4 in the 1/4 but thats a very common number for mildly modified setups. Yes some that make monster power won't see a gain b/c they have the power to pull huge gears to redline anyway.

Whos this 777 guy you seem to be :hump: what are his mods? what does his truck run?

It's a hemi, not a cummins, they don't like to be lugged with tall gears at all.

I dont remember what he runs but his NA times maybe close to yours.What are your times?

I believe in his 2003 hemi ram he ran like a 13.9 N/A.

The quickest hemi RCSB rams run stock gears

Well lets look at the power band of a mildly modified hemi. Anyone have a dyno sheet handy?

As stated most hemi rams run 30.5" tires.

We'll cover a good spectrum here.
4.56 gears, 30.5" tire:
100mph=5028
105mph=5279
110mph=5530

That sure does seem like a pretty optimum rpm range to be pulling through the lights.

3.92 gears, same tire:
100=4322
105=4538
110=4754

Unless your rev limiter won't let it spin over 5200 the deeper gears will be a big advantage. Now on nitrous motors with all the torque they build instantly you can get away with a taller gear, same goes for turbo motors, lug them a bit and it spools a lot harder.

Personally I have to say untill you drive a truck with 4.56 gears, and preferably a stall converter to go with it ya really can't talk. I run a 29" slick with 3.92 gears and it's HUGELY over geared. I've never been a big fan of 4.56 with a short tire cause I drive a lot but i'll likely be gearing it very soon. Right now it goes 88mph in the 1/8th and doesn't even hit 3rd gear, but has only pulled 106 in the 1/4 at 4800rpm N/A, LOL.

Oh and those rpm figures are assuming the TC is lockedup.

But just to say oh the fastest trucks around run X gear is a very very bad way to choose parts. It's all about the overall combination, There are guys in the deep 11's with 4.56, soon to be 4.88's, then there are guys with stock 3.92 gears. It's all combo based. But as you start adding cams, pcm, etc your always moving the power UP the rpm range, in which case you can spin lower gears, giving the motor more leverage and thus accelerating faster.

At any rate he ordered them and we'll see how it goes once they are installed. I'm NOT an advocate of super low gears, but with a tall tire they aren't bad at all. (duh) I'd never run them on 27" tires like some of the dak guys tho.

It might work that way with the dakotas, but you are so far off with the new gen hemi powered rams its funny, not trying to flame here but I haven't seen a 2003 and up ram turn 7,000 rpms yet, not even really 6,000, you can get close with a programmer, but not many of these guys are running one. Average tire size is about 30.5 inches on the rams running here with factory 20s.

haha so lets see here with a 30.5" tire running 4.56 gears... he's turning 5300@ 105mph and a hair over 5500 @ 110. That sure does seem to be right about the sweet spot for a hemi.

with stock gears it's turning 4500 @ 105, WAY too low in the power band. Anyway you guys do as you feel right.

And if he's running 13.9 N/A, i've got over a sec on him N/A and I haven't even done a gear change yet either. And I know for a fact mine will drop a good bit when I do. sooooo :drive:

When talking about trucks I am always refering to fullsize trucks for comparisons I consider the mini truck to be a whole different topic.

Whats a "mini" truck? We're not talking about S-10's, tacomas and such. If your talking about my dak well last time I checked it still has a V8, and is longer/heavier than a RCSB silverado so not exactly a "mini" truck. If you have some useful info to add please do so, but crying about truck size seems like your compensating for something.

The Dakota is refered to as a mid size truck, not a compact or full size, kinda in its on class, even the R/Ts.

The Dakota is refered to as a mid size truck, not a compact or full size, kinda in its on class, even the R/Ts.


Well,myself and friends have always called them mini trucks

2002 V-8 Dakota sport has a curb weight of 3645Lbs.

Magazine quote:
"The 2002 Dakota Regular Cab 4X2's closest competitors include the Chevrolet S-10, the Mazda Cab Plus 4x2, and the Toyota Tacoma 4X2. Upon introduction, both trims are equipped with a standard 3.9-liter, V6, 175-horsepower engine that achieves 15-mpg in the city and 21-mpg on the highway. A 5-speed manual transmission with overdrive is standard, and a 4-speed automatic transmission with overdrive is optional. The 2002 Dakota Regular Cab 4X2 is a carryover from 2001."

They class them with the other mini trucks

My brother has his gears, but won't put them in yet because his Hpp3 apparently does not correct the speedo for gear tire changes on 03 hemi trucks. How would one fix that?

I thought because the speed sensor is in the diff. you dont need to calibrate the speedo,check into it further.

Well,myself and friends have always called them mini trucks



I guess they are called mini or however ya wanna look at it, not full sized anyway right......LMAO!

You do not need to adjust for gear changes. Only tire changes.

Wow I wanna know where they got those curb weight figures. All the RC's i've heard are in the high 3900's and CC around 4200. They are smokin some good shit at 36xx.

Yeah the speedo sensor is in the diff, nothing to worry about with the speedo sensor.

Here's some stats,I need to back off and quit being a dick.
http://www.autoweb.com/content/research/vir/index.cfm/vehicle_number_int/1009934/Action/StandardFeatures#specs

That is good news on the speed sensor. Thanks guys.