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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Rear Drivelines, Drive Axles and Gearing => Topic started by: F-body Demon on August 13, 2007, 04:25:45 am

Title: 81 K10 Gears?
Post by: 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

Title: Re: 81 K10 Gears?
Post by: Blazin 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.

Title: Re: 81 K10 Gears?
Post by: zieg85 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?

Title: Re: 81 K10 Gears?
Post by: junktruck 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

Title: Re: 81 K10 Gears?
Post by: Captkaos on August 26, 2007, 08:59:00 am

Over 80% of them came with 2.56 on 10bolts and 3.08 on 12bolts.

Title: Re: 81 K10 Gears?
Post by: CHawk on August 26, 2007, 06:14:44 pm

My '85 K10 Silverado came with a 305, 700R4 tranny, and 3.08's.

Title: Re: 81 K10 Gears?
Post by: 81Cheyenne 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.

Title: Re: 81 K10 Gears?
Post by: Captkaos 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.

Title: Re: 81 K10 Gears?
Post by: BILTUP on September 08, 2007, 06:15:51 pm

http://www.chuckschevytruckpages.com/73-87specs.html

Near the bottom.