Mack458 Posted October 11, 2010 Share Posted October 11, 2010 I have a 1965 B Model Mack pumper with a Mack RAS 508 rear and a CR 84 carrier assembly. The current gear set is 5.14 and I would like to get a little more speed, better economy, and let wear on the motor. So I am looking for a 4.25 or 4.63 gear set.If anyone has a suggestion I would greatly appreciate your input.Many thanks in advance,Mack458 Quote Link to comment https://www.bigmacktrucks.com/topic/16092-looking-for-425-or-463-gear-sets/ Share on other sites More sharing options...
mattb73lt Posted October 14, 2010 Share Posted October 14, 2010 I converted a B-42 to diesel power and used the original RAS 508 axle. I replaced the original CRS 84 carrier with a CRD 117 (4.64 ratio) out of an R model. I was worried about going from from a single reduction carrier to a double carrier with the single reduction axle. I had no issues at all with installation or operation. The CRD 117 will probably be easier (more plentiful) then the B model and give you more ratio options. Plus parts will be easier. Matt Quote Link to comment https://www.bigmacktrucks.com/topic/16092-looking-for-425-or-463-gear-sets/#findComment-65304 Share on other sites More sharing options...
vanscottbuilders Posted October 20, 2010 Share Posted October 20, 2010 I have a nice clean set of 4.53 gears in the carrier for the 508 axle.They are stored inside, and are in a wood shipping crate ready to go.Contact me here on BMT by Personal Message if I can help.Paul Van Scott Quote Link to comment https://www.bigmacktrucks.com/topic/16092-looking-for-425-or-463-gear-sets/#findComment-65601 Share on other sites More sharing options...
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