3.91 Gearset for Type O 12 bolt

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February 17th, 2014, 12:10 PM

twjoyce

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Join Date: Nov 2011

Location: Sturtevant, WI

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3.91 Gearset for Type O 12 bolt

I have a new, never opened Richmond 3.91:1 gear set that was bought for a '68 442 with the 12 bolt cover, (10 bolt 8 1/2 ring gear). Also have a new, never opened installation/bearing kit for same. Fits '68-'70 (some say '67 also). As far as I know these are not being made any more and may not ever be again. $350.00 for all including USPS Parcel Post to the lower 48. Tom Joyce (OCA #013935) Sturtevant, WI. joycebrosrest@wi.rr.com

February 17th, 2014, 12:21 PM

71 455x

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Posts: 25

Hi can You put richmond part # off gears and bearing Kit#.

February 17th, 2014, 01:53 PM

joe_padavano

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Are these the thick gears for the three-series carriers?

February 17th, 2014, 03:06 PM

oldsmobiledave

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Location: Delta BC Canada

Posts: 3,688

Fyi

Quote:

Originally Posted by joe_padavano

Are these the thick gears for the three-series carriers?

If they are Richmond gears they have to be for the 3.08 - 3.23 carrier.

February 17th, 2014, 05:50 PM

montvaleplace

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Posts: 464

gears

Pm sent

February 18th, 2014, 08:39 AM

507OLDS

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Location: Erie,PA

Posts: 3,814

They will fit the 588 and 672 carriers by milling .100" off the backside. I have done this numerous times without any issues. You are basicly making them like the original GM's when you do this.The Richmonds have deeper bolt holes,so there is not the issues of bottoming the bolts out.

February 18th, 2014, 02:23 PM

BackInTheGame

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Join Date: Jul 2009

Location: Colorado - Front Range

Posts: 2,367

Milling .100"

Brian, I found and purchased last year a NIB set of 3.42:1 Richmond Gears. Can I assume that the same .100" will have to be milled from the back side of my 3.42 ring gear to fit on a 588 carrier?

Rich