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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. |
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. |
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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) |
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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) |
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.
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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 |
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angela |
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 |
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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