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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Medina2928 on December 31, 2012, 09:42:44 am

Title: 83 GMC K 1500 ring and pinion 10 bolt
Post by: Medina2928 on December 31, 2012, 09:42:44 am

What is the biggest gear ratio I can go with on my truck without having to change rear ends.  I would like to buy a ring and pinion set and drop in. The truck has 3.08 gears now but I  putting 33 inch tires on.  Thanks.

Title: Re: 83 GMC K 1500 ring and pinion 10 bolt
Post by: zieg85 on December 31, 2012, 11:04:51 am

http://eastcoastgearsupply.com/i-127197-gm-10-bolt-8-5-ring-pinion-yukon-gear.html says 5.13...  But remember you have to change the one up front as well...

Title: Re: 83 GMC K 1500 ring and pinion 10 bolt
Post by: Captkaos on December 31, 2012, 11:28:06 am

What transmission do you have?  For 33's I would go 3.73 or 4.10 depending on what transmision you have.

Title: Re: 83 GMC K 1500 ring and pinion 10 bolt
Post by: Medina2928 on December 31, 2012, 11:44:23 am

I have the 700r4. Which is being overhauled right now.  And yes I know you have to change both.  Thanks again.

Title: Re: 83 GMC K 1500 ring and pinion 10 bolt
Post by: bake74 on December 31, 2012, 12:42:29 pm

Quote from: Captkaos on December 31, 2012, 11:28:06 am

What transmission do you have?  For 33's I would go 3.73 or 4.10 depending on what transmision you have.

     Anything taller and it will have the opposite effect you want.  Your engine sped will be higher when at freeway speeds you will end up burning more gas just keeping up with traffic.