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Old 05-15-2010, 01:54 PM   #1
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Has anyone swapped from 3.73 to 3.42 with the G56 & a 5.9?

Im tired of RPM's. I drive on the highway too much to enjoy the gearing anymore. My highway mileage can be 16 or 20 depending on speed. the 20mpg was 61mph.

I was talkin to Bodie aka SPEEDSHIFT about this topic. He said that he can get his hands on 3.42's....somebody is making them aftermarket...but it wasn't exactly cheap. I told him to try it and let me know how much MPG's changed and he replied trying to get me to try it first

Has anybody made this swap with a G56 and the 5.9? I can read all day about it on 6.7's but can't find much info concerning the 5.9. if its a proven ~2mpg on the highway, its probably worth the swap.....
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Last edited by 973604x4; 05-15-2010 at 02:00 PM.
 
Old 05-15-2010, 02:01 PM   #2
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depends on how much you drive, those mud tires in your pics actually make you get less mpg, getting the rpms down will help though. have you thoughta about a gear vendors overdrive.
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Old 05-15-2010, 02:15 PM   #3
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i have nitto terra grapplers now.....had pro comp xtreme a/t's.....0 mpg difference. 305/55/20.....speedo is off 1mph at 70mph.

its cheaper to swap to a 3.42 instead of gear vendors.
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Old 05-15-2010, 03:55 PM   #4
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Wouldnt hurt, I had the same issue on my 06 even with 315/70's it drove me nuts, another option would be a g56 from an 08+, much lower OD. But it will probably a more expensive option.
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Old 05-15-2010, 04:51 PM   #5
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is there a way to calculate what my rpm would be at 70mph IF i swapped to 3.42?
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Old 05-15-2010, 05:23 PM   #6
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here you go 3.73 is 2.95 for the first gen G56
http://www.gearvendors.com/4x4ddrive.html
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Old 05-15-2010, 05:55 PM   #7
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Who's carrying those 3.42's?? I'll try it! Is this an option on the newer trucks?
gear vendors will cost you 4 grand when all is said and done!
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Old 05-15-2010, 06:24 PM   #8
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Just search 'AAM 11.5 4:42' google works wonders. And I'm planning on swapping to the 09 g56. I got a deal in it for free. Got one off my car lot I'm gunna swap out. Can't beat that.
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Old 05-15-2010, 06:57 PM   #9
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Quote:
Originally Posted by 973604x4 View Post
is there a way to calculate what my rpm would be at 70mph IF i swapped to 3.42?
divide by 3.73 and multiply by 3.42
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Old 05-16-2010, 04:04 PM   #10
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Who's carrying those 3.42's?? I'll try it! Is this an option on the newer trucks?
gear vendors will cost you 4 grand when all is said and done!
3.42 became an option with a G56 in 08 i believe...ive also read that it was only available on single wheel trucks, not duallys

thank you forrest for that reminder ..............my RPM would be ~2063 at 70mph with 3.42's. I was hopin for a little less but that's still an improvement.

but i still can't decide if its worth the money....

dangerous06...give it a shot, less us know if the gear change really helps mileage in your normal driving.
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Old 05-16-2010, 05:31 PM   #11
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Its not really worth the money, especially since you have two axles to swap gears in. I was wanting to do the swap on my '07 2wd, but at $6-800 for the swap(gears and labor) itll take a while to pay itself off. At least with a 4wd you can also go with taller tires to drop the revs, im limited with a 2wd, I dropped my rpms about 100 just going to the 305/50/20s.

I think the gear set was $450~ last I checked, for one axle. IMO get a tall narrow tire, try the 285/75/17s.
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Old 05-16-2010, 07:57 PM   #12
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the 3.42's would be sweet in your truck Wade...
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Old 05-17-2010, 08:39 AM   #13
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dangerous06...give it a shot, less us know if the gear change really helps mileage in your normal driving.

OK then if we all chip in 20. I think I can do this next week! Send your cash to my paypal account!!
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Old 05-17-2010, 08:59 AM   #14
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Quote:
Originally Posted by 973604x4 View Post
Im tired of RPM's. I drive on the highway too much to enjoy the gearing anymore. My highway mileage can be 16 or 20 depending on speed. the 20mpg was 61mph.

I was talkin to Bodie aka SPEEDSHIFT about this topic. He said that he can get his hands on 3.42's....somebody is making them aftermarket...but it wasn't exactly cheap. I told him to try it and let me know how much MPG's changed and he replied trying to get me to try it first

Has anybody made this swap with a G56 and the 5.9? I can read all day about it on 6.7's but can't find much info concerning the 5.9. if its a proven ~2mpg on the highway, its probably worth the swap.....
I was looking at the 3.42s really hard for a while, but by the time they are in the truck for both front and rear it will be about $2k, with bearing kits, gear sets, oil, and labor. This is the way I see it, the gear swap would be 2k and you would get about a 400rpm drop, a gear vendors is around $4k for 800-1000rpm drop which is great, but twice the cost and you still have a turd trans that you cant get parts for, and are not reliable under high HP. Oooooorrr you can swap in an automatic get a 400rpm drop, and build it stronger than the G56, aaaaannnd you dont have to shift gears.

Yes of course a built auto is more expensive, but for me it is a better solution, I get lower rpm for the better mileage, I make the truck way faster on the track, and I dont have to shift gears anymore which is just something I want now.
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Old 05-17-2010, 09:04 AM   #15
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Who's carrying those 3.42's?? I'll try it! Is this an option on the newer trucks?
gear vendors will cost you 4 grand when all is said and done!
Randy's Ring and Pinion had them on their site, and AAM makes them.
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Old 05-17-2010, 09:51 AM   #16
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Have Joe make you a set of 3.08s Phil
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Old 05-17-2010, 05:51 PM   #17
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Have Joe make you a set of 3.08s Phil
Who's JOE? And yes please may I have one!!
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Old 05-17-2010, 06:03 PM   #18
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Have Joe make you a set of 3.08s Phil
i bet i really can't afford that chit
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Old 05-17-2010, 07:01 PM   #19
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I have 3.42's in my 04.5. Its the best damn all around gear I've ever had in a truck. 80mph is just shy of 2k rpm in od. fuel milage is great. And I have plenty of tack left at the drags
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Old 05-17-2010, 10:02 PM   #20
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the 3.42's would be sweet in your truck Wade...
They would be, but at $600-800, ill be holding out for a while
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