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05-15-2010, 01:54 PM
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#1
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Name: 973604x4
Title: aka landphil
Status: Not Here
Join Date: Sep 2006
Location: College Station/Energy, Texas
Member`s Gallery
Posts: 1,808
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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.....
__________________
2012 Ford 6.7 FX4
SAW 'EM OFF!
Last edited by 973604x4; 05-15-2010 at 02:00 PM.
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05-15-2010, 02:01 PM
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#2
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Name: scott2001
Title: Its never fast enough
Status: Not Here
Join Date: Oct 2008
Location: Alabama
Member`s Gallery
Posts: 1,800
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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.
__________________
2008 6.4 with and the cabs hanging in the air right now
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05-15-2010, 02:15 PM
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#3
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Name: 973604x4
Title: aka landphil
Status: Not Here
Join Date: Sep 2006
Location: College Station/Energy, Texas
Member`s Gallery
Posts: 1,808
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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.
__________________
2012 Ford 6.7 FX4
SAW 'EM OFF!
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05-15-2010, 03:55 PM
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#4
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Name: bh10
Title: Web Wrencher
Status: Not Here
Join Date: Feb 2008
Location: Iowa, now in Georgia, again
Member`s Gallery
Posts: 1,974
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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.
__________________
14 CTD
95 12v
Big Thanks To PURE DIESEL POWER CSnyder @ Snyder Motorsports
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05-15-2010, 04:51 PM
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#5
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Name: 973604x4
Title: aka landphil
Status: Not Here
Join Date: Sep 2006
Location: College Station/Energy, Texas
Member`s Gallery
Posts: 1,808
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is there a way to calculate what my rpm would be at 70mph IF i swapped to 3.42?
__________________
2012 Ford 6.7 FX4
SAW 'EM OFF!
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05-15-2010, 05:23 PM
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#6
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Name: SKYNYRD
Title: "Drunkard"
Status: Not Here
Join Date: May 2007
Location: Harpers Ferry, WV
Member`s Gallery
Posts: 5,665
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here you go 3.73 is 2.95 for the first gen G56
http://www.gearvendors.com/4x4ddrive.html
__________________
Leonard
79 VW rabbit diesel (ALH & 4motion )
04.5 rclb 4x4
01 & 03 VW Golf TDI
05 rcsb 2wd (in progress )
ROSKOE115: "It's ain't avatar material but I'd hit it!"
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05-15-2010, 05:55 PM
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#7
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Name: dangerous06
Title: diesel tech
Status: Not Here
Join Date: Mar 2008
Location: Escondido CA
Member`s Gallery
Posts: 3,564
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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!
__________________
E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built
48RE, 5" exhaust,Carrillo rods, Pacbrake!
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05-15-2010, 06:24 PM
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#8
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Name: Gibson
Title: There's no love in diesel
Status: Not Here
Join Date: Oct 2008
Location: Gonzales, Texas
Member`s Gallery
Posts: 4,076
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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.
__________________
all my trucks are broke down
2003 Dodge 2500 Cummins QC SRW
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05-15-2010, 06:57 PM
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#9
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Name: Scooter's Roofing
Title: Too Much Time
Status: Not Here
Join Date: Oct 2006
Member`s Gallery
Posts: 17,007
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Quote:
Originally Posted by 973604x4
is there a way to calculate what my rpm would be at 70mph IF i swapped to 3.42?
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divide by 3.73 and multiply by 3.42
__________________
that's pretty much all of it
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05-16-2010, 04:04 PM
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#10
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Name: 973604x4
Title: aka landphil
Status: Not Here
Join Date: Sep 2006
Location: College Station/Energy, Texas
Member`s Gallery
Posts: 1,808
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Quote:
Originally Posted by dangerous06
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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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.
__________________
2012 Ford 6.7 FX4
SAW 'EM OFF!
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05-16-2010, 05:31 PM
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#11
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Name: Pooter
Title: MFNG
Status: Not Here
Join Date: Jun 2007
Location: DFW, TX
Member`s Gallery
Posts: 152
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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.
__________________
'12 CCSB 2500 4wd
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05-16-2010, 07:57 PM
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#12
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Name: Scooter's Roofing
Title: Too Much Time
Status: Not Here
Join Date: Oct 2006
Member`s Gallery
Posts: 17,007
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the 3.42's would be sweet in your truck Wade...
__________________
that's pretty much all of it
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05-17-2010, 08:39 AM
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#13
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Name: dangerous06
Title: diesel tech
Status: Not Here
Join Date: Mar 2008
Location: Escondido CA
Member`s Gallery
Posts: 3,564
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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!!
__________________
E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built
48RE, 5" exhaust,Carrillo rods, Pacbrake!
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05-17-2010, 08:59 AM
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#14
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Name: SPEEDSHIFT
Title: Too Much Time
Status: Not Here
Join Date: Jan 2007
Location: San Antonio, TX
Member`s Gallery
Posts: 5,978
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Quote:
Originally Posted by 973604x4
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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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.
__________________
@bodie_armstrong
2003 2500 4x4 auto FOR SALE
2005 2500 4x4 auto Drag Truck
2013 3500 4x4 Aisin Dually Tow Rig
Tenacity Tuning, Longs Machine Shop, BD Diesel Performance
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05-17-2010, 09:04 AM
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#15
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Name: SPEEDSHIFT
Title: Too Much Time
Status: Not Here
Join Date: Jan 2007
Location: San Antonio, TX
Member`s Gallery
Posts: 5,978
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Quote:
Originally Posted by dangerous06
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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Randy's Ring and Pinion had them on their site, and AAM makes them.
__________________
@bodie_armstrong
2003 2500 4x4 auto FOR SALE
2005 2500 4x4 auto Drag Truck
2013 3500 4x4 Aisin Dually Tow Rig
Tenacity Tuning, Longs Machine Shop, BD Diesel Performance
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05-17-2010, 09:51 AM
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#16
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Name: displacedtexan
Title: $500 PREMIUM MEMBER
Status: Not Here
Join Date: Feb 2008
Location: Mobilehoma
Member`s Gallery
Posts: 13,876
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Have Joe make you a set of 3.08s Phil
__________________
I talk loud.
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05-17-2010, 05:51 PM
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#17
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Name: dangerous06
Title: diesel tech
Status: Not Here
Join Date: Mar 2008
Location: Escondido CA
Member`s Gallery
Posts: 3,564
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Quote:
Originally Posted by displacedtexan
Have Joe make you a set of 3.08s Phil
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Who's JOE? And yes please may I have one!!
__________________
E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built
48RE, 5" exhaust,Carrillo rods, Pacbrake!
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05-17-2010, 06:03 PM
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#18
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Name: 973604x4
Title: aka landphil
Status: Not Here
Join Date: Sep 2006
Location: College Station/Energy, Texas
Member`s Gallery
Posts: 1,808
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Quote:
Originally Posted by displacedtexan
Have Joe make you a set of 3.08s Phil
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i bet i really can't afford that chit
__________________
2012 Ford 6.7 FX4
SAW 'EM OFF!
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05-17-2010, 07:01 PM
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#19
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Name: globaltruck1
Title: Too Much Time
Status: Not Here
Join Date: May 2009
Location: FROSTBURG MD
Member`s Gallery
Posts: 634
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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
__________________
04.5 Twined, Big Don M's Roll Caged and ready!
00 DRAGON FIRE VP 6X16'S, SILVER BULLET, MAX SPOOL 2.5++, SBC DD3600 Deceased!!
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05-17-2010, 10:02 PM
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#20
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Name: Pooter
Title: MFNG
Status: Not Here
Join Date: Jun 2007
Location: DFW, TX
Member`s Gallery
Posts: 152
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Quote:
Originally Posted by Forrest Nearing
the 3.42's would be sweet in your truck Wade...
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They would be, but at $600-800, ill be holding out for a while
__________________
'12 CCSB 2500 4wd
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