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04-23-2007, 06:55 PM
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#1 |
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Registered User
Join Date: Feb 2006
Location: nashville
Posts: 217
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My stomach dropped
I pulled my rear cover off today know that I had a non posi 373 and the numbers read 14:43 stamped could gm had made a mistake cause I know I was runnin over 3000 at 65 have 275/60/15 tires
 when I divide 43/ 14 I GET 307
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1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold
Last edited by paaw; 04-23-2007 at 07:08 PM. Reason: add info |
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04-23-2007, 07:04 PM
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#2 |
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Registered User
Join Date: Feb 2006
Location: nashville
Posts: 217
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Re: My stomach dropped
pic not turning out good but numbers are
3817779 14:43 gm 12-71 2
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1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold
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04-23-2007, 07:07 PM
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#3 |
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Weekend Warrior
Join Date: Oct 2004
Location: CT
Posts: 1,787
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Re: My stomach dropped
What are your trying to ask exactly? -
if you want to know the gear ratio - you have to count the teeth on the "ring" and then on the "pinion" - divide the numbers to get the ratio. over 3k @ 65 would probably be a 3.73 or lower (numerically higher) gear ratio.
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-'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered   
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04-24-2007, 07:09 PM
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#4 | |
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Registered User
Join Date: Dec 2006
Location: Rhode Island
Posts: 602
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Re: My stomach dropped
Quote:
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69 C-10 SWB Fleetside 454/TH400 (For Sale) http://67-72chevytrucks.com/vboard/c...ct=1299&cat=12 70 El Camino 454 TH700 29 Model A 4-DR Sedan Deluxe Last edited by mnunn454; 04-24-2007 at 07:09 PM. |
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04-24-2007, 08:20 PM
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#5 |
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Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
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Re: My stomach dropped
HTML Code:
Or that the tach has been lying to you..........
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'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) |
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04-23-2007, 07:08 PM
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#6 |
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Gone Fishing
Join Date: Aug 2005
Location: Fort Worth, Texas 76135
Posts: 12,361
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Re: My stomach dropped
I run 3200rpm at 70 in my 68 swb 350/350 3.73 posi
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68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop  Frame of resto has been started2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616 |
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04-23-2007, 07:15 PM
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#7 |
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Registered User
Join Date: Feb 2006
Location: nashville
Posts: 217
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Re: My stomach dropped
am I adding wrong or something I keep getting 3.07
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1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold
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04-23-2007, 07:22 PM
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#8 |
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Registered User
Join Date: Mar 2006
Location: USA
Posts: 21,020
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Re: My stomach dropped
14:43 means 3:07,thats the gears you have....Still dont believe?Count the teeth on the ring and pinion.If there is 43 and 14,which there should be,then its 3:07 gears.Period
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04-23-2007, 07:39 PM
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#9 |
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Senior Member
Join Date: Jan 2005
Location: Loveland Co.
Posts: 3,098
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Re: My stomach dropped
Your speedo must be off.
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Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html |
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04-23-2007, 07:45 PM
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#10 |
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Registered User
Join Date: Mar 2007
Location: Rapid City, South Dakota
Posts: 285
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Re: My stomach dropped
not to butt in but how can you adjust speedo mine is off by 20mph at 65it only reads 45, i know for sure because i used gps on a clear day to check it
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,Clint LOUD PIPES SAVE LIVES  69 C-10 short stepside 406 sbc, 02 YAMAHA WR250F, 07 SUZUKI SV650S, 81 Grand Prix 355 sbc, 81 XT 500 YAMAHA |
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04-23-2007, 07:59 PM
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#11 |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,645
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Re: My stomach dropped
-
Might find some info here for the speedo..... http://www.transmissioncenter.net/sp...n_______va.htm Here are the ratio numbers: Ratio 2.56:1 - Tooth Combination 41,16 Ratio 2.73:1 - Tooth Combination 41,15 Ratio 3.07:1 - Tooth Combination 43,14 Ratio 3.08:1 - Tooth Combination 40,13 Ratio 3.08:1 - Tooth Combination 37,12 Ratio 3.31:1 - Tooth Combination 43,13 Ratio 3.36:1 - Tooth Combination 37,11 Ratio 3.42:1 - Tooth Combination 41,12 Ratio 3.55:1 - Tooth Combination 39,11 Ratio 3.73:1 - Tooth Combination 41,11 Ratio 4.10:1 - Tooth Combination 41,10 Ratio 4.11:1 - Tooth Combination 37,9 LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 04-23-2007 at 08:01 PM. |
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04-23-2007, 10:26 PM
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#12 | |
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The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,484
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Re: My stomach dropped
Quote:
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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04-23-2007, 08:00 PM
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#13 |
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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: My stomach dropped
are you goin by the POS 35 year old tach?
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04-23-2007, 08:17 PM
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#14 | |
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Self-proclaimed LED man
Join Date: Nov 2003
Location: Harrisburg, Missouri
Posts: 1,021
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Re: My stomach dropped
Quote:
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My LED Website My Photobucket Album of LED's Ask me about hand-made custom L.E.D brake and reverse lights. <- LINK I also do LED: -Third Brake/Cargo -Brake (truck and burb) -Reverse (truck and burb) -67-68 Front Turn Signals -69-70 Front Turn Signals -71-72 Front Turn Signals -GMC Front Turn Signals I can also do custom lights for other vehicles....i did a set for a AMC Gremlin once  Norwood Survivor |
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04-23-2007, 10:18 PM
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#15 |
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Registered User
Join Date: Feb 2006
Location: nashville
Posts: 217
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Re: My stomach dropped
going by after market tach, I would have know this I would have saved the money on the 700r and bought tires for my 20's, goint to have to count the teeth, cause it used to whine on the highway once I got over 70 with the factory trans in there
__________________
1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold
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04-23-2007, 10:19 PM
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#16 |
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Registered User
Join Date: Feb 2006
Location: nashville
Posts: 217
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Re: My stomach dropped
did 307 come factory 72
__________________
1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold
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04-23-2007, 10:24 PM
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#17 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Re: My stomach dropped
Yeah
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal.  We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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04-23-2007, 10:43 PM
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#18 |
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Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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Re: My stomach dropped
My truck with the same rear gears and tire size pulled right at 75 mph at 3,000 rpm. 65 was around 2,600 rpm, IIRC.
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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04-23-2007, 11:05 PM
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#19 |
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Registered User
Join Date: Feb 2007
Location: yuma arizona
Posts: 448
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Re: My stomach dropped
ive tryed to find my numbers on my axle, cant find.. can someone tell me where they are found and if the numbers are raised or not
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04-23-2007, 11:07 PM
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#20 |
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Registered User
Join Date: Mar 2006
Location: USA
Posts: 21,020
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Re: My stomach dropped
The 14:43,ect numbers are located on the ring gear....inside the differential
Last edited by 1969k10stepside; 04-23-2007 at 11:08 PM. |
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04-23-2007, 11:19 PM
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#21 |
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Registered User
Join Date: Feb 2006
Location: nashville
Posts: 217
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Re: My stomach dropped
how fast should i be running in 3rd gear at 2000 rpms with these gears
__________________
1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold
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04-24-2007, 12:10 AM
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#22 |
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Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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Re: My stomach dropped
Around 50 mph.
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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04-24-2007, 12:28 AM
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#23 |
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EZEKIEL 25:17
Join Date: Oct 2001
Location: Springfield IL USA
Posts: 984
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Re: My stomach dropped
look on the back of your tach it might be set on the 6 cylinder setting.
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68 CHEVELLE(HORSESHOE) 69 LONGHORN 396 70 NOVA 454(FOR SALE) 71 SWB 307 71 EL CAMINO 383 72 GMC JIMMY 350 87 BLAZER 350 WIW? http://blog.360.yahoo.com/blog-r5CJt...9_6Orzim4L5uWM Gun control, the theory that 110lb. women have the "right" to fistfight with 210lb. rapists. The reason animal rights activists are more passionate about fur than leather is because it's safer to harrass rich women than bikers... |
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04-24-2007, 12:39 AM
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#24 |
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It's the air up here
Join Date: Mar 2007
Location: Western Colorado
Posts: 710
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Re: My stomach dropped
speedo gear in transmision? gear change in transmission?
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04-24-2007, 12:40 AM
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#25 |
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Registered User
Join Date: Oct 2000
Location: St. Johns, Arizona
Posts: 2,660
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Re: My stomach dropped
Doing the basic math with the numbers you gave gives the following:
27" tire. IF you have 3.07 gears, and no overdrive, you should be running approx 2400 rpm* at 65. With 700r4 overdrive, about 1700 rpm* IF you have 3.73 gears, and no overdrive, you should be running approx 2900 rpm* at 65. With 700r4 overdrive, about 2000 rpm* IF you have 4.10 gears, and no overdrive, you should be running approx 3200 rpm* at 65. With 700r4 overdrive, about 2250 rpm* * All rpms are rounded Given the information you gave, it would appear someone has swapped your gears for something in the 4.10 range. If you have something other than that, you should check your speedometer against mile posts and a stopwatch, and check your tach against a different tach.
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my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans? Last edited by ckhd; 04-24-2007 at 12:46 AM. |
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