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#1
10-20-2007, 06:02 AM
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Gear Ratio
I just bought an 83 GMC Sierra and I'm trying to find out what the gear ratio is but i cant seem to find the matching code. I know they usually start with a G but the only G codes there are: G50 GQ1 G80 i tried to google it but couldnt find it. Here are all of my codes:
A01 A28 CD4 D45 E63 F59 F60 GQ1 G50 G80 J50 LE9 MX0 NL2 N41 N67 TT5 U35 U37 O58 V22 V31 V42 WB4 XBJ YBJ YE9 ZBJ ZY1 Z49 18D 29L Also wondering if my stock 3.73 gears from my 2001 Silverado will fit in the 1983? They're both 10 bolt diffs.
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 NEW - 2004 Chevrolet Silverado 5.3L RCSB Z71 Hooker AeroChamber - Black Bear Tune - Welds - 33" Mickey Thompsons 01 Silverado 4.8L ECSB 4x4 True Flow - Magnaflow - Black Bear Tune - 35" BFG A/T - 4.56 Auburn SOLD  83 Sierra RCSB 2wd 350 Under construction 
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#2
10-20-2007, 10:04 AM
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Re: Gear Ratio
Pull inspection plate and the gear ratio should be stamped on ring gear.
If not count ring gear and pinion teeth and post back or divide ring gear teeth by pinion teeth.
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Remember proper testing gives us the answer to many problems. MT
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#3
10-20-2007, 01:50 PM
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Re: Gear Ratio
Quote:
__________________
NEW - 2004 Chevrolet Silverado 5.3L RCSB Z71 Hooker AeroChamber - Black Bear Tune - Welds - 33" Mickey Thompsons 01 Silverado 4.8L ECSB 4x4 True Flow - Magnaflow - Black Bear Tune - 35" BFG A/T - 4.56 Auburn SOLD 83 Sierra RCSB 2wd 350 Under construction
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#5
10-20-2007, 02:45 PM
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Re: Gear Ratio
GQ1 is "Standard Ratio". According to the post http://www.hotrodders.com/forum/rear...ing-82449.html this meant 2.73 except when MM3 tranny was installed. This info is for 81 so it may not apply to yours.
You should post the ratio when you verify what it is. //2000CAYukon
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