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034x4qc4.7
Dodge Dakota
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10/17/2005
17:43:22
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 Subject: performance gain from 3.55 to 4.10
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hey who has switched from 3.55 to 4.10. how big was the differenc in eccleration. im thinkg of getting 4.10 but im curious if it made a big deiffernece.
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Kowalski
GenIII
10/17/2005
18:09:51
|  RE: performance gain from 3.55 to 4.10
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No hard #s for you; but seat of the pants the difference is significant. You'll be pleased.
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GraphiteDak
GenIII
10/17/2005
18:15:58
| RE: performance gain from 3.55 to 4.10
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Has anyonw found a complete set of 4.56 gears for the 9 1/4 AND the 8" IFS dour our trucks?
I see 4.10's everywhere. But 4.56's seem scarse.
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Kowalski
GenIII
10/17/2005
18:39:01
| RE: performance gain from 3.55 to 4.10
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One source would be Accuautoparts.com. While they list 4.56 rear gears from Precision and Richmond for the rear, they only list front sets from Motive or Yukon. Maybe not avilable for the front from those companies ? Available from some companies anyway. The 4.10s are pretty nice, don't think I'd go 4.56 unless dragging a 2x or going to 33s on a 4x. I was tempted; but very pleased with the 4.10s
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Adam
Dodge Dakota
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10/17/2005
19:23:26
| RE: performance gain from 3.55 to 4.10
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Just want to get something straight...going to a lower gear is going to put me at higher rpms all the time right?
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ScojoDak
Dodge Dakota
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10/17/2005
19:39:54
| RE: performance gain from 3.55 to 4.10
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Yes, your rpm's will higher from what they were before.
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Adam
Dodge Dakota
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10/17/2005
19:43:23
| RE: performance gain from 3.55 to 4.10
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That's why you get better performance right? Since your running higher rpms it just puts you closer to your peak?
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daddio
Dodge Dakota
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10/17/2005
20:04:02
| RE: performance gain from 3.55 to 4.10
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going to a higher numerically gear ratio basically gives the engine more leverage to move the truck.
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8banger
GenIII
10/17/2005
21:57:51
| RE: performance gain from 3.55 to 4.10
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G.D.
My buddy just lifted his 04 Ram QC and is running 35" mudders. He went with 4.56's and I got a ride in his truck. The length of the gears seems really short even with 35's. I think if we go with 4.56 on our 30" stockers we would be in trouble. Even 32's might not be enough. Now that I rode in his truck I am leaning more towards 4.10's
03 Dakota 4X4 QC SportPlus 4.7L 3.55 LSD AWD
Superchipped, 2Chamber Flowmaster Dumped, K&N Drop-in, 2"Torsion Lift
MY 4X4'S BAPTISM
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toolfan
Dodge Dakota
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10/17/2005
22:27:32
| RE: performance gain from 3.55 to 4.10
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the gears will keep you in the upper power band and you will have quicker shifts. it will make a good difference as long as your not worried about gas mileage.
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95V6
GenII
10/18/2005
00:03:04
| RE: performance gain from 3.55 to 4.10
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It'll also reduce your top speed at given rpm.
95 3.9L 4WD V6, K&N, Gibson exh, JBA hdrs, JET stage II, MSD 6A and more..
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Fed
Dodge Dakota
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10/18/2005
12:20:47
|  RE: performance gain from 3.55 to 4.10
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question...
what does gas mileage have to do with any of this gear changing
i can understand the way the gears are technically shorter or
smaller, leading to less mphs in each gear but why would all this
affect the gas mileage??
thats why they made O/D right?
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Mark
Forum Moderator
10/18/2005
14:37:10
| RE: performance gain from 3.55 to 4.10
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I went from 3.55 to 3.92 and feel the difference. MPG is also reduced because your engine is running at a higher rpm for any speed.
-Mark Hryckiewicz
1993 Sport RC SB 5.2L Auto
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chris4x4
Dodge Dakota
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10/18/2005
16:12:10
| RE: performance gain from 3.55 to 4.10
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I switched to 4:10's (32" tires) from 3:55's and my mpg went up.Was getting about 14mpg city, now get between 15 and 16 city. The 4:10's seem to be a perfect match for the Dakota's with the 4.7. Much quicker than stock, even when passing on the highway.
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95V6
GenII
10/18/2005
17:22:31
| RE: performance gain from 3.55 to 4.10
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That's because you also switched to bigger tires. If you stay w/ smaller tires and switch to 4.10 ratio, then engine makes more turns for each yard you travel. Bigger tires compensate for this.
95 3.9L 4WD V6, K&N, Gibson exh, JBA hdrs, JET stage II, MSD 6A and more..
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Kowalski
GenIII
10/18/2005
17:53:57
| RE: performance gain from 3.55 to 4.10
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While conventional wisdom would be that a swap to lower gearing would lead to lower milage due to higher revs, this is not always the case. Several of us have found we got slightly better milage going to 4.10 with the 4.7 - likely because of better engine efficiency at the higher revs (same sized tires). Depending on your set up, it might even raise your top speed, since top speed is often limited by power, not just revs. Lower gearing gives you higher torque, similar to the principle of leverage, as daddio says. I would suspect my top speed is now higher, but I won't be checking that with a raised 4x4. Some of you may have noticed this on street bikes - your going as fast as you can in top gear, but you're not at redline because speed is being limited by your wind resistance - so you drop a gear and find you are going faster with that lower gear - it is putting more poiwer to the ground that way.
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toolfan
Dodge Dakota
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10/18/2005
18:52:57
| RE: performance gain from 3.55 to 4.10
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with lower gears in city drive you are likely to get better mileage. both have there up and down but lower gears are more suited in a truck.
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FLDak
Dodge Dakota
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10/19/2005
11:05:42
| RE: performance gain from 3.55 to 4.10
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I'm with Kowalski on this!
Here is an old link when I first got my 4.10s installed. Close to the bottom of the thread I posted my MPG on a trip.
Oh and it did not change my speedlimiter back then either.
http://www.dodgedakota.net/boards/per/7666.html
Hope this helps someone...
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04 Dak
Dodge Dakota
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10/19/2005
11:48:52
| RE: performance gain from 3.55 to 4.10
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I have a 04 dak QC 4.7 on 33's with 3.55's my uncle has the same truck but a 00 and on 35's with 4.56's we raced the other day and I thought he would smoke me being his overall gear is still lower than mine. But when we raced I smoked him bad he had me till about 30mph then I pulled him to 100mph and we did this 5 times from a stop from a rolling start and I always got him. The only difference was the exhaust I have a 3" system and he has a 2.5" with a glasspack. This was before I put my H.O. cams in now I want to race him agian and see how bad I beat him now. But he has deep pockets and is taking his truck to KRC and having them put 206 cams in it and exhaust and program the pcm so we will see who wins now.
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Fed
Dodge Dakota
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10/19/2005
12:07:56
| RE: performance gain from 3.55 to 4.10
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wow that would be interesting to read about
please let us know how that race goes!
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Kowalski
GenIII
10/19/2005
12:51:01
| RE: performance gain from 3.55 to 4.10
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04 Dak - in your example there is another difference beyond the exhaust. Your uncle's 35 inch tires will be harder to accelerate because they are heavier; and if they are wider or more agressive, they will have more rolling resistance too.
Good luck on your next race !
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