question for you guys w/ 35 inch tires - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hilljob26** · 07-24-2005, 09:10 PM

i have a 72 4x4 w/ 35's,i think i need to change the speedometer gear in the transfer case,where exactly do i find one and what do i ask for,i took the truck on its first road trip to get the bed done at the body shop,and the speedometer just didn't feel like what i was really driving,like it said 40 when i felt like 50-55,or was it the other way around,oh well,can anyone help

tedfrk · 07-24-2005, 09:12 PM

i am pretty sure you can get the gears from any gm dealer but i forget how to decide which one you need

a28doc · 07-25-2005, 04:51 AM

here is a great site to figure out what gears you need it tells you the formula to use to figure it out gl Doc

http://www.novaresource.org/speedo.htm

**special-K** · 07-25-2005, 06:56 AM

You`re about 10% off with those tires.So 40mph is 44.If you run Swampers you just get to know the pitch at a certain speed.Then you don`t even need to look at the speedo.It`s a kind of cruise-control/speed-warning thing in your head.lol

**hilljob26** · 07-26-2005, 05:21 PM

thanx guys,that great info will help

07-24-2005, 09:10 PM	#1
hilljob26 Registered User Join Date: Dec 2004 Location: Gypsum Kansas 67448 Posts: 1,681	question for you guys w/ 35 inch tires i have a 72 4x4 w/ 35's,i think i need to change the speedometer gear in the transfer case,where exactly do i find one and what do i ask for,i took the truck on its first road trip to get the bed done at the body shop,and the speedometer just didn't feel like what i was really driving,like it said 40 when i felt like 50-55,or was it the other way around,oh well,can anyone help __________________ 21 2500hd duramax 58 apache HILLJOB GRAPHIX--for all your graphic needs My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=542497 LS ENGINE SWAP INFORMATION THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=377348 4l60 to an NP205 http://67-72chevytrucks.com/vboard/s...43#post3697343

07-25-2005, 04:51 AM	#3
a28doc '87 V20 4x4 Join Date: Jun 2004 Location: South Western Ohio Posts: 1,073	here is a great site to figure out what gears you need it tells you the formula to use to figure it out gl Doc http://www.novaresource.org/speedo.htm __________________ '86 K5 Blazer 4x4 FOR SALE '87 v20 4X4 '99 S10 Blazer 4X4

07-25-2005, 06:56 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	You`re about 10% off with those tires.So 40mph is 44.If you run Swampers you just get to know the pitch at a certain speed.Then you don`t even need to look at the speedo.It`s a kind of cruise-control/speed-warning thing in your head.lol __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 07-25-2005 at 06:58 AM.

07-26-2005, 05:21 PM	#5
hilljob26 Registered User Join Date: Dec 2004 Location: Gypsum Kansas 67448 Posts: 1,681	thanx guys,that great info will help __________________ 21 2500hd duramax 58 apache HILLJOB GRAPHIX--for all your graphic needs My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=542497 LS ENGINE SWAP INFORMATION THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=377348 4l60 to an NP205 http://67-72chevytrucks.com/vboard/s...43#post3697343

07-24-2005, 09:12 PM	#2
tedfrk Registered User Join Date: Feb 2005 Location: forked river nj Posts: 147	i am pretty sure you can get the gears from any gm dealer but i forget how to decide which one you need



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