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12-16-2006, 12:51 AM
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The Hammer Man
 
Join Date: Oct 2006
Location: Wilmington, NC
Posts: 864
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Another gear ?
How do you tell what gears you have without taking off the cover? I run 3300 rpms going 80 and she feels good, i get 16mph and I think she's quick off the light. But i would like to know the numbers i have.
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Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T |
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12-16-2006, 12:56 AM
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#2 |
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Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,334
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Re: Another gear ?
sounds like 3.73 what size tires are you running?
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RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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12-16-2006, 01:06 AM
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4 eyed fever
Join Date: Jul 2005
Location: Eureka, Nevada
Posts: 500
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Re: Another gear ?
If you have an non posi rear, jack up 1 back wheel, mark your driveline and tire with a piece of chalk, rotate your tire 2 revolutions and count the number of revolutions on your driveline. A little over 4 revs=411s, 3 3/4 revs=373s, 3 1/2= 342s.....you'll be able to tell what gears if you know which ones are available.
If you have a posi, you have to lift both rear tires, and then one rev on the tire and count the revs on the driveline IIRC. I wish I was getting 16 mpg!
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1971 GMC 2500 4x4 1972 GMC Sierra Grande 1/2 t 4x4-#1 son's truck. Recently completed resto. 4 YO daughter," Daddy, I like your truck better than Mom's." (2000 F350-ranch truck) Smart kid!! |
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12-16-2006, 01:07 AM
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#4 |
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The Hammer Man
Join Date: Oct 2006
Location: Wilmington, NC
Posts: 864
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Re: Another gear ?
Tires: 275/60/15.
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Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T |
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12-16-2006, 01:12 AM
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#5 |
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The Hammer Man
Join Date: Oct 2006
Location: Wilmington, NC
Posts: 864
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Re: Another gear ?
If i have 3.73, and i like the way it is all over town and the highway, but i want posi, what will it effect in the way it drives? Will i notice a difference? will it take away from the easy feel i have no on the highway? Just because i want to smoke both my tires for blocks is not a good enough reason to ruin the quiet and smooth way it handles now.
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Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T |
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12-16-2006, 01:12 AM
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#6 |
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Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,334
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Re: Another gear ?
Well according to here
http://www.1010tires.com/TireSizeCal...?action=submit Your tires are 27.99 make it 28  and go here http://www.angelfire.com/fl/procrastination/rear.html Looks like 3.07 according to this. I am assuming that you have a 350 or 400 turbo tranny.
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RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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12-16-2006, 01:14 AM
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#7 |
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The Hammer Man
Join Date: Oct 2006
Location: Wilmington, NC
Posts: 864
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Re: Another gear ?
YES, TH400 tranny
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Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T |
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12-16-2006, 01:17 AM
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#8 |
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Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,334
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Re: Another gear ?
I cant answer your question on how it would feel since I have never had a posi. All I know is that you will smoke both tires when you stomp on it
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RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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12-16-2006, 01:25 AM
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#9 |
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Registered User
Join Date: Apr 2005
Location: Chula Vista, California
Posts: 495
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Re: Another gear ?
It will not be a true "locked" posi. It will be a limited-slip, meaning there are clutches in the assembly that lock both wheels under load, but allow one wheel to slip slightly when turning corners. Under normal driving you will not notice any difference from a "one-legged" non posi rear end.
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rwgregory 67 GMC 2500 ,2w/d wide box 305 V-6, 4-speed |
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12-16-2006, 02:48 AM
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#10 |
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Senior Member
Join Date: Jul 2006
Location: Blountville, Tn.
Posts: 3,904
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Re: Another gear ?
HAd a Limited slip in a Nova I USED to own. I really couldn't tell a difference from an open diff. to a "posi" diff. but When I dumped the clutch I left two black liiiiiiiine's instead of one.
Last edited by BarryB; 12-16-2006 at 02:49 AM. |
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12-16-2006, 10:21 PM
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#11 |
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laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,128
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Re: Another gear ?
Using the Richmond gear calculator with the given 80 mph and 3300 rpms and 28" tall tire it comes up with a 3.44 gear which would actually be a 3.42. A good all around ratio in a non OD application. 16 mpg is nothing to fret about.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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12-16-2006, 11:10 PM
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#12 |
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Super Trucker
Join Date: May 2005
Location: Newnan, Georgia
Posts: 201
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Re: Another gear ?
i'm turning 3k at 65 with a 28" tall tire. according that i have 3.73's thanks i was curious what my gearing was, i was starting to think i had 4.11's those things are DEEP. well, to me anyway.
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American by birth, Southern by the grace of God. ".. you aint just whistlin' Dixie..." Rebel till I die Last edited by blacktruck; 12-16-2006 at 11:14 PM. |
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12-16-2006, 11:18 PM
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#13 |
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turbo enthusiast
Join Date: Jan 2004
Location: carmichael, ca.
Posts: 1,826
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Re: Another gear ?
is there a link to that richmond gear calculator?
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"But daddy, I didn't hit them all with a stick"...what my 6 year old tells me when I pick him up from school early for fighting  "
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12-16-2006, 11:22 PM
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#14 |
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laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,128
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Re: Another gear ?
Sure. Try this. http://www.richmondgear.com/101032.html It's pretty handy. You can adjust tire size, gear ratio, o/drive or not to come up with a suitable gear.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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