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06-02-2009, 05:22 AM #1
I have a 06 silverado. single cab, it has a leveling kit on top of a 6 inch suspension on top of a 3 inch body lift. so around 11 inches all together. im currently running 35's . i know to small for the amound of lift. but im going to be putting some 37's on when i get back from deployment. i still have my stock 3:42 gears in there from when i bought it. its not to bad on driving around anymore but i wanna get a lil bit of that power back like it was when i left the lot 3 years ago. i am having my family put it in the shop for me so its ready when i get back. i was thinking about running 4:56's but the guy at the shop is recomending 4:88's. everything i ever read suggest 4:56's. my truck is a 4.8 with an automatic tranny. the tire and wheel combo im looking at are some black pro-comp alloys with 37 inch X- terrains. any help would be greatly appreciated.
06-02-2009, 05:30 AM #2
in my opinion 4.56 should be fine.thats what id go with.then again with 11ins of lift and 37s 4.88 may not be a bad idea.sombody else may be able to help you a little more.i was running 38s with about 10"s of lift on my f250 with 4.56 gears and never had a problem-Dylan
2004 Silverado 4x4
1986 K5 Blazer
8" Superlift w/39.5 super swampers
1992 GMC Jimmy "Blue Bomber"
06-02-2009, 05:45 AM #3
thanks man. so your in the army or was in the army?
06-02-2009, 06:21 AM #4
yea still am.ive been in for about 2 1/2 years
06-02-2009, 06:46 AM #5
4.56's are going to compensate real well for the tires up to 37's. Anything bigger then you should look at 4.88s but you'll probably get the improvement you want power wise with the 4.56s.
The fool learns not from the wise man, but the wise man from the fool.
2004 Silverado 4x4 (Suzie)
6" Fabtech Suspension Lift
35" NITTO Terra Grapplers
18" MB Wheels Predators
Thrush Turbo Series Mufflers
on true dual exhaust
Grille by Option Racing
Finally getting torn down to the frame.
06-02-2009, 09:39 AM #6
According to the charts going from a 31" tire to a 37" tire with a 3.42 axle you should change to 4.08. So a 4.10 is the recommended ratio and if you want a little more low end and a little less mileage 4.56 would be optimal.
Here's a calculator if you want to check it out for yourself. Click HereJim
2004 SILVERADO 2500HD LS
Pro Comp Leveling Kit
285-75-16 Cooper ST All Terrains
Pro Comp Programmer
Linux Bed Liner
1967 Landcruiser <350 Chevy>
1990 Geo Metro Convertible
2007 FJ Cruiser
06-02-2009, 04:42 PM #7
ya 4.56s are a good choice, my buddy runs 4.56s in his 02 sierra and its a good combo.
06-02-2009, 11:21 PM #8
Look, I have basically the same set-up as you. 4.56s are perfect for 35" tires. If you decide to go to 37s, go with the 4.88s. I have the 5.3L, 35s and 4.56s. They are perfect. You have the 4.8L, you should really consider 4.88s since you have a smaller engine. Think about the long run...35s & 4.56s would be ok. You go to 37s, you are going to be right back down to a doggish start like you have now with your 3.42s. Believe me, I lived it just like you have. 4.88s FTW.2005 Chevy Silverado Z71 in Black
6" BDS Suspension Lift | 3" BDS Body Lift |17" Rock Crawler Stellies | 35" Cooper STTs | 4.56 Yukon Gears | AirAid CAI and TBS | Flowmaster 40s | HyperPAC Programmer
2001 TJ Sahara in Sienna
3.5" RE Suspension Lift | 33x12.50 Baja MTZs | D30/44 | ROKMEN Merc Front Bumper | Warn Rockcrawler Rear w/ Carrier | Warn M8000 Winch
06-03-2009, 01:09 AM #9
i have an 07 Classic with a 5.3 with a Rancho Suspension lift and 35 in Super Swamper LTBs. if i was looking for better fuel milage would a 4.10 or a 4.56 gear ratio be more beneficial?
06-03-2009, 12:04 PM #10
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