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03-11-2009, 10:44 PM
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#1 |
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I really hate wet sanding!
 
Join Date: Dec 2008
Location: Brookfield, MO
Posts: 601
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Any idea's on what rear end gear I have?
I have a 69 chevy with 327 and newly rebuilt th350 and the tire size is 255/70R15. Running down highway at speeds of 65 mph, motor is turn 3200 rpms, making me a little uncomfortable to take it very far. I can find no markings on my rear end and the glovebox decal is unreadable. Any ideas? Am thinking it must have 3.73's or higher. By the way great site here!
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03-11-2009, 10:54 PM
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#2 |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Any idea's on what rear end gear I have?
Unless your axle was changed there should be a number stamped on the passenger side on top of the axle. It may take some sand paper or wire brush to make it out. If you do happen to locate it, go to GMC Pauls site below.
Scroll down to locate your info. http://www.gmcpauls.com/67-72_chevy.htm |
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03-11-2009, 11:00 PM
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#3 |
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Insert Title Here
Join Date: Feb 2006
Location: Dyer, Indiana
Posts: 5,679
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Re: Any idea's on what rear end gear I have?
I have the same size tires with 4:56 gears and its running about the same RPM's as you
__________________
BOBBY _69 SWB_ 1000 pics of 67-72's>> http://s193.photobucket.com/albums/z...-72/?start=all << |
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03-11-2009, 11:13 PM
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#4 |
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Senior Member
Join Date: Nov 2001
Location: Rapid City, SD
Posts: 2,281
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Re: Any idea's on what rear end gear I have?
tire size is 255/70R15 (= 29 inch tall)
speed of 65 mph motor is turn 3200 rpms Well that figures out to be about a 4.25 gear (probably not) But... I figured out a few because tire sizes vary brand to brand: tire size is 255/70R15 (= 29 inch tall) speed of 65 mph motor is turn 3096 rpms rear gear = 4.11 ratio OR tire size is 255/70R15 (= 28.5 inch tall) speed of 65 mph motor is turn 3150 rpms rear gear = 4.11 ratio OR tire size is 255/70R15 (= 28 inch tall) speed of 65 mph motor is turn 3200 rpms rear gear = 4.11 ratio Hope that helps...
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My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White Last edited by 67 cst swb; 03-11-2009 at 11:15 PM. |
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03-12-2009, 03:31 AM
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#5 |
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I really hate wet sanding!
Join Date: Dec 2008
Location: Brookfield, MO
Posts: 601
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Re: Any idea's on what rear end gear I have?
thanks everyone for the info!
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03-12-2009, 06:12 AM
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#6 |
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resident oilfield trash
Join Date: Jan 2009
Location: Lubbock TX
Posts: 1,465
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Re: Any idea's on what rear end gear I have?
get you a 700 no more worries
__________________
1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada 
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03-12-2009, 11:43 PM
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#7 |
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I really hate wet sanding!
Join Date: Dec 2008
Location: Brookfield, MO
Posts: 601
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Re: Any idea's on what rear end gear I have?
Yeah I know, but just put in a fresh 350 and it will not be daily driven so fuel mileage not that big an issue. Was more concerned about destroying my engine....lol, thanks all for the help!
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