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02-11-2009, 11:54 AM
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#1 |
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Registered User
Join Date: Apr 2008
Location: Monroe, La
Posts: 42
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what rearend do i have?
i need to know what gears are in my rearend. the truck is a 86' gmc 2wd longbed if you need any more info let me know.
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02-11-2009, 12:13 PM
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#2 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: what rearend do i have?
jd. Only 2 ways to tell. one is try to get the numbers off the top of the right hand axel tube and take them to or call a dealer parts dept. Second, pull the cover off the rear end, rotate the ring gear and look for a series of numbers. There will be a series of 4 numbers seperated by a ":". Example 15:42 ect. OK, now divide the 42 by 15 and thats your ratio. Jim
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1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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02-12-2009, 01:18 AM
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#3 |
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Registered User
Join Date: Aug 2006
Location: Mesa, Arizona
Posts: 136
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Re: what rearend do i have?
Mine has a RPO sticker in the glove box. It says the ratio with all of the other options.
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79 Blazer Cheyenne, 2wd 305 3.42 stock 85 Caprice, TBI converted, new 350 crate motor, Monte Carlo SS Wheels, Bilstein shocks, |
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02-12-2009, 02:04 AM
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#4 |
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70+ ( Old Skool Club )
 
Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,107
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Re: what rearend do i have?
On the RPO Sticker in the glove box you need to find the codes that begin with the letter "G".
GU4 3:08 Ratio GU6 3:42 Ratio GT4 3:73 Ratio If you have the "G80" code as well then you have positraction on the truck.
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 Last edited by Already Gone; 02-12-2009 at 04:53 PM. |
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02-12-2009, 04:14 AM
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#5 |
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Go Hard or Go Home!
Join Date: Dec 2008
Location: quitman, tx
Posts: 261
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Re: what rearend do i have?
count the teeth on the ring gear and divide that by the number of teeth on the pinion gear. thats a sure fire way of KNOWING what gear ratio you have.............
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75 short wide 350, some mods, scare the piss outta ya quick. 2008 Dodge crew cab. YEAH, it's got a hemi, your ass is going to jail quick.  Some day's, it's just not worth chewing through the restraints................................ |
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