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Author Topic: 81 K10 Gears?  (Read 14910 times)

Offline F-body Demon

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81 K10 Gears?
« on: August 13, 2007, 04:25:45 AM »
Cant really find the info guys, so I was hopin yalls might know.

What are the common gear ratios for a Chevy axle on a 1981 K10 that came with a 305?

Just wondering if I need to upgrade the gears or not. Looking for like a 3.2-3.5 ratio, nothing crazy.

Thanks
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Offline Blazin

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Re: 81 K10 Gears?
« Reply #1 on: August 13, 2007, 08:07:21 AM »
being an 81 it could have been 3;08s or 3:42s. 81 is about the earliest I have ever seen with 3:42s.
 I have an 84 K10 factory 305, SM456, and 2:73s.
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Offline zieg85

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Re: 81 K10 Gears?
« Reply #2 on: August 13, 2007, 09:57:45 PM »
Quote from: F-body Demon on August 13, 2007, 04:25:45 AM
Cant really find the info guys, so I was hopin yalls might know.

What are the common gear ratios for a Chevy axle on a 1981 K10 that came with a 305?

Just wondering if I need to upgrade the gears or not. Looking for like a 3.2-3.5 ratio, nothing crazy.

Thanks

Is your sticker still inside the glovebox?
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Offline junktruck

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Re: 81 K10 Gears?
« Reply #3 on: August 25, 2007, 10:51:35 AM »
I have an 81 k10 and it had 2.56 gear in it, i had to change to a 3.08
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Offline Captkaos

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Re: 81 K10 Gears?
« Reply #4 on: August 26, 2007, 08:59:00 AM »
Over 80% of them came with 2.56 on 10bolts and 3.08 on 12bolts.
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Offline CHawk

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Re: 81 K10 Gears?
« Reply #5 on: August 26, 2007, 06:14:44 PM »
My '85 K10 Silverado came with a 305, 700R4 tranny, and 3.08's.
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Offline 81Cheyenne

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Re: 81 K10 Gears?
« Reply #6 on: September 03, 2007, 03:23:58 PM »
Quote from: F-body Demon on August 13, 2007, 04:25:45 AM
Cant really find the info guys, so I was hopin yalls might know.

What are the common gear ratios for a Chevy axle on a 1981 K10 that came with a 305?

Just wondering if I need to upgrade the gears or not. Looking for like a 3.2-3.5 ratio, nothing crazy.

Thanks

According to a sales catalog that I found online the standard ratio for a k10 in 1981 is 3.73. The optional ratios are: 2.56,2.73,3.08 and 3.42.
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Offline Captkaos

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Re: 81 K10 Gears?
« Reply #7 on: September 05, 2007, 03:45:21 PM »
Everyone I have ever seen or owned the standard axle ratio was 2.73 or a 10 bolt 4x4.
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Offline BILTUP

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Re: 81 K10 Gears?
« Reply #8 on: September 08, 2007, 06:15:51 PM »
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