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04-09-2009, 07:22 PM
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#1 |
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J'ville Junkman
 
Join Date: Mar 2006
Location: Pomeroy, Ohio
Posts: 572
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Gear Calculator Help
I've just spent the first week tooling around in my new rig, a 72 3/4 ton Suburban, Curious about my rear gears. I have a TH400, running 2600 rpm at 55 mph, tires are 265/75-16.
Any help is appreciated. Thanks
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72 3/4t Suburban 402BB (Daily driver for 8 years)  68 GTO (never ending proj) 91 Kawasaki ZX-7R 57 Chevy 210 Wagon - 9 Passenger (Wife's project-working on floorpans) 73 Corvette (17 yr old daughter's: Another project - what's wrong with me?)  53 Willys M38 |
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04-09-2009, 07:23 PM
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#2 |
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Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
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Re: Gear Calculator Help
I bet 4:10
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04-09-2009, 07:30 PM
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#3 |
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J'ville Junkman
Join Date: Mar 2006
Location: Pomeroy, Ohio
Posts: 572
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Re: Gear Calculator Help
Yeah, I was thinking it was on the high side!!!
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72 3/4t Suburban 402BB (Daily driver for 8 years) 68 GTO (never ending proj) 91 Kawasaki ZX-7R 57 Chevy 210 Wagon - 9 Passenger (Wife's project-working on floorpans) 73 Corvette (17 yr old daughter's: Another project - what's wrong with me?) 53 Willys M38 |
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04-09-2009, 07:50 PM
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#4 |
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Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Gear Calculator Help
This gear calculator says its closer to 3.73 http://www.rocky-road.com/calculator.html
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69 Chevy 4x4 383 Power 
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04-09-2009, 07:46 PM
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#5 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Gear Calculator Help
__________________
The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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04-09-2009, 08:47 PM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Gear Calculator Help
2600 is VERY low... esp for a 3/4 ton. 3.54 in a dana is what it should have come with, but even then, that sounds a bit low for that even.
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04-09-2009, 08:51 PM
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#7 |
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J'ville Junkman
Join Date: Mar 2006
Location: Pomeroy, Ohio
Posts: 572
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Re: Gear Calculator Help
I have been wondering if my speedo is off?
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72 3/4t Suburban 402BB (Daily driver for 8 years) 68 GTO (never ending proj) 91 Kawasaki ZX-7R 57 Chevy 210 Wagon - 9 Passenger (Wife's project-working on floorpans) 73 Corvette (17 yr old daughter's: Another project - what's wrong with me?) 53 Willys M38 |
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04-09-2009, 09:12 PM
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#8 |
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Registered User
Join Date: Apr 2006
Location: Pacifica CA
Posts: 66
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Re: Gear Calculator Help
You could always get under it and count, It's a PITA but it works.
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04-09-2009, 09:41 PM
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#9 |
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J'ville Junkman
Join Date: Mar 2006
Location: Pomeroy, Ohio
Posts: 572
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Re: Gear Calculator Help
So I have only done that once, remind me. By memory: I turn the tire two complete turns and count the revolutions of the drive shaft???
__________________
72 3/4t Suburban 402BB (Daily driver for 8 years) 68 GTO (never ending proj) 91 Kawasaki ZX-7R 57 Chevy 210 Wagon - 9 Passenger (Wife's project-working on floorpans) 73 Corvette (17 yr old daughter's: Another project - what's wrong with me?) 53 Willys M38 |
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