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Is there rear end for a B67 Mack I can interchange to run 65 MPH at 1700 RPM, or does the truck have the power to do it ?? Thanks Richard

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I just finished swaping the rear in my B42 this week, I went from a 7.85 (35mph) to 4.60 I've only had her out once since the swap but I pushed to 61-62 and still had a lot of room to climb before reaching the govener. I had the good fortune to find a mack rear end out of a B67 here on the forum and after a little research here we were able to determain that my axle housing would hold the hogshead from the other axle so I just swaped that and had the drive shaft shortened to fit.

Your top speed will also depend on whether you have an overdrive transmission or not. I've got a 10 speed duplex with over drive when I'm in 4 hi which is direct I top out at 55 on 22" rubber.

My posts from this whole swap are here in the antique section and are with in the last 2 months.

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You forgot to say it was 70 in reverse.

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my 613t will do 75 on 11R24.5's a single over triplex and 4.00 rears just bobtailing but try to pull anything with it and it falls on its face with a 711. it was originally specked with a 673t, a single over triplex and 4.66 gears on 22'' rubber and in the spec sheet it said must go 65mph. like they said it all depends what you wanna do with it and what tire size and if you have an overdrive trans. you can get higher speed out of on but don't expect to pull much weight with it. I believe my B613 was specked to go 65mph with 22 inch rubber and a single overdrive but I bet the overdrive in 5th was ''go home empty gear' only

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