Jump to content

Looking For 4.25 Or 4.63 Gear Sets

Recommended Posts

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,


Link to comment
Share on other sites

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

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...