What speedo gears do I need? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Russell · 01-07-2005, 02:22 PM

Hey guys!

I'm converting my truck to 4x4 real quick here, and I need to know what gears to get myself. I've got a set of stock steel wheels from a 2002 Chevy 2500 (8 lug, no idea what size the stock tires are) a TH400, and a set of 4.10 gears in the rear diff. Would anyone be so kind as to tell me what speedo gears I'd need to get to make my speedo accurate?

8t5Silverado · 01-07-2005, 02:25 PM

What was the original gear ratio in your truck and what size tires did it come with?

Russell · 01-07-2005, 02:30 PM

Has 3.73s, and 31" tall tires at the moment. Shes a 3/4 ton, so 8 luggers all around

badone07 · 01-08-2005, 09:46 PM

You can can look them up at any of the following links. The 1st link does the math for you...

http://www.bgsoflex.com/speedo1.html

http://www.transmissioncenter.net/sp...n_______va.htm

http://www.tciauto.com/tech_info/speedo_gears.htm

01-07-2005, 02:22 PM	#1
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	What speedo gears do I need? Hey guys! I'm converting my truck to 4x4 real quick here, and I need to know what gears to get myself. I've got a set of stock steel wheels from a 2002 Chevy 2500 (8 lug, no idea what size the stock tires are) a TH400, and a set of 4.10 gears in the rear diff. Would anyone be so kind as to tell me what speedo gears I'd need to get to make my speedo accurate? __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

01-07-2005, 02:25 PM	#2
8t5Silverado Mudslides 'r my specialty Join Date: Dec 2003 Location: STL Posts: 1,106	What was the original gear ratio in your truck and what size tires did it come with? __________________ Always on the lookout for old cars and parts...(20s, 30s, 40s, 50s, 60s, etc.) http://www.cardomain.com/memberpage/500339

01-07-2005, 02:30 PM	#3
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Has 3.73s, and 31" tall tires at the moment. Shes a 3/4 ton, so 8 luggers all around __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

01-08-2005, 09:46 PM	#4
badone07 Project 2 Resume Join Date: May 2004 Location: Jim Thorpe, PA Posts: 884	You can can look them up at any of the following links. The 1st link does the math for you... http://www.bgsoflex.com/speedo1.html http://www.transmissioncenter.net/sp...n_______va.htm http://www.tciauto.com/tech_info/speedo_gears.htm __________________ John 1984 C30 Chevy Crew Cab Dually 1998 Jeep Cherokee 4x4 2004 Chevy Trailblazer 4x4 (wife's) 1970 Mustang FB fully tubed (getting 521 BBF & powerglide) 1978 Nova 2dr (going BBCaddy & S.P. th400) 1984 Monte SS (circle track car)

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