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Author Topic: 10 Bolt Posi with 3:90 Gears  (Read 3445 times)

Offline chronos

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10 Bolt Posi with 3:90 Gears
« 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
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Offline eventhorizon66

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Re: 10 Bolt Posi with 3:90 Gears
« Reply #1 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.
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'85 C10 SWB 350 700R4 TKO600

Offline SUX2BU99

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Re: 10 Bolt Posi with 3:90 Gears
« Reply #2 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!
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85 Chevy Silverado C10 short, wide, yellow, 2wd. Lowered, 60-over 350 with Dart Iron Eagle heads and Comp Cams XE268 cam, TH350 w/ shift kit, 3.40 Gov-lok 12 bolt.
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