What gears should I run? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shenk10 · 11-28-2010, 12:57 AM

I figured I'd post this here since my plans are to have a 6.0. I am either going to have a 4l80e or 4l90e depeding on whether I buy an engine I'm looking at or not. I'm not sure there would be a difference since they are both 4 speeds. I have the same rear wheel set up that Dennis has on silver's build which I'm assuming everyone looking at this has seen. I have a 12 bolt that I am re-doing and basically changing everything. 3.73 gears seem to be popular on this kind of engine swap so I was thinking about going with them. This isn't my every day drive but hopefully it will be someday. Thanks for any information anyone can provide.

**scotts62** · 11-28-2010, 10:09 AM

3:73 is a good all around gear and its good for playing around and towing, I put them in my DD and love them.

60apache · 12-02-2010, 12:26 AM

Quote:

Originally Posted by scotts62

3:73 is a good all around gear and its good for playing around and towing, I put them in my DD and love them.

x2

usmcchevy · 12-02-2010, 10:51 AM

Here is a spread sheet for gear ratios. Just experiemnt with different rear ratios until you get what you want. I'm going 3.73.

http://67-72chevytrucks.com/vboard/s...d.php?t=274314

Jacfourteen · 12-03-2010, 02:06 PM

My 01 tahoe has 5.3, 4l60e, and 3.73's it is heavier than your truck and has 32"x12.5" tires and it is a good all around gear. I've towed a 6000 lb. trailer with no problems before. When cruising down the highway at 70 MPH I'm spinning right at 2000 RPM.

11-28-2010, 12:57 AM	#1
shenk10 Registered User Join Date: Feb 2009 Location: New Park, PA Posts: 312	What gears should I run? I figured I'd post this here since my plans are to have a 6.0. I am either going to have a 4l80e or 4l90e depeding on whether I buy an engine I'm looking at or not. I'm not sure there would be a difference since they are both 4 speeds. I have the same rear wheel set up that Dennis has on silver's build which I'm assuming everyone looking at this has seen. I have a 12 bolt that I am re-doing and basically changing everything. 3.73 gears seem to be popular on this kind of engine swap so I was thinking about going with them. This isn't my every day drive but hopefully it will be someday. Thanks for any information anyone can provide. __________________ Jordan 1972 Chevy K5 Blazer, 6" Lift, 35x13.5R15, 6.0/6L80E/NP205 1982 Chevy C10 SWB, 2006 LS2/4l70e In progress.... http://67-72chevytrucks.com/vboard/s...d.php?t=439860

11-28-2010, 10:09 AM	#2
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: What gears should I run? 3:73 is a good all around gear and its good for playing around and towing, I put them in my DD and love them. __________________ Scott 93 crew cab build Project 62 Last edited by scotts62; 11-28-2010 at 10:09 AM.

12-02-2010, 10:51 AM	#4
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: What gears should I run? Here is a spread sheet for gear ratios. Just experiemnt with different rear ratios until you get what you want. I'm going 3.73. http://67-72chevytrucks.com/vboard/s...d.php?t=274314 __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

12-03-2010, 02:06 PM	#5
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: What gears should I run? My 01 tahoe has 5.3, 4l60e, and 3.73's it is heavier than your truck and has 32"x12.5" tires and it is a good all around gear. I've towed a 6000 lb. trailer with no problems before. When cruising down the highway at 70 MPH I'm spinning right at 2000 RPM. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's



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