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-   -   Truck differentials: 3.73 vs 4.10 (http://forums.pelicanparts.com/off-topic-discussions/587037-truck-differentials-3-73-vs-4-10-a.html)

Jim Bremner 01-21-2011 07:52 PM

Quote:

Originally Posted by Rednine11 (Post 5799777)
i dont claim to be an expert at anything but I'd stay with 3:73's
4.10 makes the engine wind pretty tight and kills fuel mileage'

Had 4:10's in HEMI Cuda

Bet you wish you still had it!

That and your 4:10 rear gear hemi had a 1.1 tranny

The truck will have about a .68 overdrive so the rear gears are like 2.78 add in taller tires and the rear gears drop to around 2.50 to 1


I had a 4:11 rear gear in my Mustang with a .68 overdrive 5,200 rpm was pushing it down the road at 152mph.

billybek 01-22-2011 04:21 AM

My 6 liter GMC 2500 HD also has 4:10s.
I upped the tire size from LT 245s to LT 265s.
It does a little better on fuel consumption on the highway and dropped the RPM at 70 mph by a couple of hundred RPMs.
I haven't put the camper on the truck since the tires were changed out, so I can't comment on how it handles the weight.

mpeastend 01-22-2011 01:35 PM

Quote:

Originally Posted by kaisen (Post 5800153)
What type of data? I have all the data you'd need on the truck to do the math.

The L96 (6.0L) motor with VVT is pretty amazing in that it makes 380 ft-lb peak @ 4200 rpm, but makes over 300 ft-lb from 1200rpm to 6000rpm, and more than 350 from 2500 rpm to 5500 rpm. So for a gas NA motor, it's a pretty flat torque curve.

Well it was the type of info you just posted. I knew the max hp & tq but not what the curve looked like. I needed to know that based on what both you & Angela posted...where would I be in the powerband with the different gearing. I know it's nitpicking, I just had no idea the torque & hp band were so fat on that motor! It's like a diesel! Thanks Eric! I appreciate the info! BTW, how would you know that? The power usually isn't graphed and posted on the manufacturer websites. I see from some of your other posts that you're involved in selling cars so I assume you have access to more info. I guess they might post info like that on a magazine writeup of the pickup.

Thanks to all for helping me with my question...a 4.10 it is! (a diesel just isn't in the cards right now, unfortunately)

kaisen 01-22-2011 01:40 PM

Quote:

Originally Posted by mpeastend (Post 5801430)
BTW, how would you know that?

Thanks to all for helping me with my question...a 4.10 it is! (a diesel just isn't in the cards right now, unfortunately)

Well, for one I ran a GMC dealership. Two, I have some media access from pieces I've done under my nom de guerre. Three, I'm a car geek like that.

http://archives.media.gm.com/us/powertrain/en/product_services/2010/gmna/HPT%20Library/Gen%20IV/Gen%20IV%20Truck/2010_60L_L96_Sierra%20HD%20less%2010.pdf

Variable valve timing really helps the L96 produce a flat torque curve. Ford uses a similar system in their 2005-up 5.4L (but much less power)

masraum 01-22-2011 01:45 PM

I bet someplace like Car and Driver or Motor Trend would have that info in an article. You might even be able to find some dyno chats posted on the net somewhere.

kaisen 01-22-2011 02:16 PM

Here's the 6L90Es spec sheet:

http://archives.media.gm.com/us/powertrain/en/product_services/2010/gmna/Spec%20Sheet/Transmissions/2010%20Automatics/10_6L90_MYD_n.xls

Do the math in each gear based on engine rpm, rear end ratio, and overall tire diameter and you'll see the overall speed versus engine speed and where the next gear up/down correlates to engine rpm.

If you don't want to use the link:

4.03 1st
2.36 2nd
1.53 3rd
1.15 4th
0.85 5th
0.67 6th
-3.06 R

Laneco 01-22-2011 05:21 PM

Quote:

Originally Posted by kaisen (Post 5800084)
FYI, a Duramax diesel's ONLY gear choice is 3.73. Think about it. If a 4.10 were automatically 'better', wouldn't they offer that choice? And if 4.10 is great, why not 4.56? Etc, et al. It's a system. And there's a lot more involved than just the final gear ratio.

If you have 600 lbs of torque in a street truck (Duramax - bone stock) you can probably run an even taller than 3.73 - way taller - and get away with it. The Duramax is simply beastly. Love that engine.

angela

afterburn 549 01-22-2011 06:13 PM

with out getting into a High School argument..ant diesel will be beter then a gas pot...4:10 will help you take advantage of some situations...and ..it all depends what transmision you ar married to...a Auto has a magig thing called Torq multipcation.....I have a standard 6 speed..I can pull 30,000 with almost no effort
A gas pot would die
Like I said B4 real trucks need 4:10 with over drive

mpeastend 01-22-2011 10:03 PM

Wow, Eric, that's great info! Thanks so much! Man, glad I posted my question. I was searching and just would get for & against without any real substantive answers! Awesome!


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