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chris
Dodge Dakota
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1/13/2003
20:34:15
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 Subject: 4.10's or 4.56's
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02 dakota, I have done all of the basic mods. 20's to come in a few months and I think the last and final mod will be gears. More dakotas have upgraded to the 4.10's but being that I am not lifted, but lowered, how would it be if I was to drop 4.56's in the rear end?
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kota on 20s
GenIII
1/13/2003
20:40:07
| RE: 4.10's or 4.56's
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if it is a auto trans, go for it!! i know a few RT guys who put 4.56's in, and they love them.
if its a 5 speed, its a toss up between the 3.92's and 4.10's it just depends on what size tire you are running.
~Eric
Superdupercharged, M-1, 1.7 RR's, 52mm TB, PPH Ceramic Headers & Y-pipe, 3" carsound cat, 3" dumped gibson
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chris
Dodge Dakota
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1/13/2003
20:51:52
| RE: 4.10's or 4.56's
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Falken 294/45/20 tires will be the size tire im running. I'm an auto!
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kota on 20s
GenIII
1/13/2003
22:54:52
| RE: 4.10's or 4.56's
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4.56's all the way dude!
~Eric
Superdupercharged, M-1, 1.7 RR's, 52mm TB, PPH Ceramic Headers & Y-pipe, 3" carsound cat, 3" dumped gibson
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smittyt2
Dodge Dakota
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1/14/2003
08:08:16
| RE: 4.10's or 4.56's
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Just remember you will be taching around 3 grand at 70. I am at 2500 with the 4.10's which isn't too bad. It does take away from your top end power too, or it did on mine, but is probably the most impressive mod, for the money, that you can really feel.
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R/Truck
Dodge Dakota
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1/14/2003
11:59:23
| RE: 4.10's or 4.56's
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It depends on the engine/tranny too. The 360/318 guys will see 3000rpm at 80mph, which is not a huge jump from stock (approx. 400)
I think the 4.10 is the max to use in the 4.7L and V6 trucks.
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xplikt
GenIII
1/14/2003
12:01:54
| RE: 4.10's or 4.56's
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The 4.7L is a big revver, all the more reason to use 4.56s in it.
-Mike
http://www.dodgetruckworld.com/xplikt/
2002 2WD RC SLT 4.7L 5spd 3.92 LSD
MBRP Single in/out, straight piped 3rd cat, turndown tip
Hotchkis swaybars and springs
Bilstein custom tuned shocks
Roadmaster Active Suspension
Shaved emblems and antennae
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Timid
Dodge Dakota
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1/14/2003
12:09:17
| RE: 4.10's or 4.56's
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Have 4.10's, used to have 3.92's, difference is not all that noticable. I wish I would have went with 4.56's. I Have 01 RC R/T.
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ME 111
R/T
1/14/2003
12:10:48
| RE: 4.10's or 4.56's
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Message:
We are running about the same diameter tires on the rear and with my 3.92s my rpm is at 1850 at 65mph. The new rears dropped my gear ratio down to about a 3.60 so I can only guess that by going to 4.56s it will actually give me around a 4.20 or so. Another guess on my part is that they will put me at about 2400rpms at 65mph and no more than that....but I could be off.
Flame Red '99 R/T CC
52mm TB - HomeBrewed K&N Intake, 3923 AutoLites, Taylor 8mm wires, TPS @.73 , 180 TStat , Falken 285/60/R17s on Rear, RoadMaster Active Suspension, SS rollpan, XTang soft Tonneau, Mopar Bra
And one Heavy Foot
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Grant
Dodge Dakota
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1/14/2003
13:18:04
| RE: 4.10's or 4.56's
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Message:
Hey, i was wondering how different diameters of tires change the gear ratios??? Kota, you said if you have a 5-speed its a toss up between the 3.92 or 4.10, just depends on tires size. Im planning on droping my dak, and the diameter of tire will probably end up being smaller, butI only have 3.55 right now. How can i figure out which gear ratio i should be wanting??
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R/Truck
Dodge Dakota
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1/14/2003
16:16:31
| RE: 4.10's or 4.56's
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Message:
www.4lo.com has lots of stuff to figure that out.
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jaggy
GenIII
1/14/2003
19:52:22
| RE: 4.10's or 4.56's
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I made a little spread sheet that might come in handy for some of you guys. I used one of the free gear ratio calcs on the web so take it with a grain of salt.
I have 265/70/16 tires.
but alas I have a 4x4 and no one makes an after market gear set for the front diff.
I hope this helps you decide.
I have a 4.7 so I ran the revs up to 6K.
I think optimal shift point is about 5800 but I am no drag king (or queen for that matter)
1st gear
3.55 3.92 4.1 4.56
1000 8 7 7 6
2000 17 15 15 13
3000 26 23 22 20
4000 34 31 30 27
4500 39 35 33 30
5000 43 39 37 33
6000 52 47 45 40
2nd gear
3.55 3.92 4.1 4.56
1000 13 12 11 10
2000 26 24 23 20
3000 39 36 34 31
4000 53 48 46 41
4500 59 54 51 45
5000 66 60 57 51
6000 79 72 69 62
3rd gear
3.55 3.92 4.1 4.56
1000 19 18 17 15
2000 39 36 34 30
3000 59 54 51 46
4000 79 72 68 61
4500 89 81 77 69
5000 99 90 86 77
6000 119 108 103 92
4th gear
3.55 3.92 4.1 4.56
1000 25 23 22 19
2000 51 46 44 40
3000 79 69 66 59
4000 102 92 88 79
4500 115 104 99 89
5000 128 116 111 99
6000 153 139 133 119
5th gear
3.55 3.92 4.1 4.56
1000 35 32 30 27
2000 70 63 60 54
3000 105 95 91 82
4000 140 127 121 109
4500 158 143 136 123
5000 175 159 152 136
6000 210 190 182 164
The formatting looks kinda crapy so if anyone wants it in excel just let me know your email and I will shoot it to you.
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POWER HUNGRY
Dodge Dakota
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1/14/2003
22:31:06
|  RE: 4.10's or 4.56's
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Message:
215/75/r15 Or equivalent size(27.7)
4.56s in OD 2290 rpms@60mph
4.10s in OD 2059 RPMS@60MPH
OD off 3.55 gears 2584 rpms@60mph
A change in tire size can cut the difference between gears or even correct the speedo after a gear change.
Example:
215/75R15(27.7")/3.55s in OD=1782rpms@60mph
32" tire/4.10 gears in OD=1782@60mph
If your going to go to a smaller tire choose the lower# gear 4.10s over the 4.56s. A change from 215/75r15(my stock size) to 255/45r17(26"dia.) will make the 4.10 gears feel like 4.36s.
A good comparison calculator for tire/gear changes can be found at
http://www.dakota-truck.net/TIRECALC/tirecalc.html
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HSKR
Dodge Dakota
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1/14/2003
23:49:49
| RE: 4.10's or 4.56's
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The '97 and newer daks will automatically correct the speedo after a gear change, but won't for tire changes. As far as gears and which to buy, I bought a set of 4.10s for my '00 R/T. Mainly due to the fact I will be running a 27" tire(1" shorter than stock) on my truck which will give me a 4.2x final gear ratio, and also the fact that I just bought 26" slicks right bwefore the gears and 4.56 gears with 26" sicks woudl give me a final rear gear of 4.76 which woudl be way to much and require me to shift into OD before the end of the 1/4 or bounce off the rev limiter. For a good source for determining the difference tire sizes make, go to www.dakota-truck.net and scroll down toards bottom to the Tire and wheel calculator. You can convert metric to inch sizes, and also compare different tire sizes to each other to see how it will effect speedo error, RPMs, and gear ratios.
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teamfast
Dodge Dakota
JOIN HERE
5/14/2003
18:43:23
| RE: 4.10's or 4.56's
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Message:
thanks to jaggy i have plugged those numbers in to excel and graphed the results for all the gear ratios. If anyone wants a copy dont hesitate to email me. Later
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