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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: chronos on August 07, 2009, 08:25:16 am

Title: 10 Bolt Posi with 3:90 Gears
Post by: chronos on August 07, 2009, 08:25:16 am

Picked up a 10 Bolt Posi with 3:90 Gears last night

I had never heard of that ratio before but thats what she is

Going to replace my old Open 10 bolt with 3:08's

Title: Re: 10 Bolt Posi with 3:90 Gears
Post by: eventhorizon66 on August 07, 2009, 10:54:59 am

3.90 is a widely available ratio for the 10 bolt and 12 bolt in aftermarket gear sets.  Just not a common factory ratio.  Cool find.

Title: Re: 10 Bolt Posi with 3:90 Gears
Post by: SUX2BU99 on August 07, 2009, 12:49:50 pm

Very nice, you should see a noticeable increase in your acceleration, as well as a decent hike in your highway RPMS  lol


I had 3.92 ratio on my Dakota R/T's and it makes for great in-town acceleration and tire burning!