Johnny_B Posted June 2, 2018 Share Posted June 2, 2018 (edited) I just purchased my first B. The previous owner (2 owners ago) ditched the rear axles and swapped in a Hendrickson suspension. I think it's off of a Freightliner by the looks of it. None of the airlines are hooked up and also the driveshaft needs figured out. Best I can tell is the pinion angle is off from the original carrier bearing. Has anyone ever attempted this conversion? Would it be easier to just go back to the OE setup? Until I get it home and look at it, I'm not sure what the gear ratio is. It's a Spicer rear and definitely heavy. I get the direction the previous owner was heading but with the gas motor and quadraplex, I'm not sure how well that's gonna fly... Thanks for any guidance. Edited June 2, 2018 by Johnny_B Quote Link to comment Share on other sites More sharing options...
Maddog13407 Posted June 2, 2018 Share Posted June 2, 2018 we need more info.need to know the gear ratio of the rear definitely an upgrade but don't plan on turning anything higher than a 5 something gear ratio with a flathead 401 and a quadbox. we stuck a 4.62 in out B42 single axle out of a B61 jus to go to shows so it would have some highway gears and not be screaming but i wouldn't ever wanna hook onto a load with it as it originally had 6.42 gears . most tandem B42's had 7.49 gear ratios or 8.10 's and would do 52 miles an hour 1 Quote Link to comment Share on other sites More sharing options...
Johnny_B Posted June 2, 2018 Author Share Posted June 2, 2018 2 hours ago, Maddog13407 said: we need more info.need to know the gear ratio of the rear definitely an upgrade but don't plan on turning anything higher than a 5 something gear ratio with a flathead 401 and a quadbox. we stuck a 4.62 in out B42 single axle out of a B61 jus to go to shows so it would have some highway gears and not be screaming but i wouldn't ever wanna hook onto a load with it as it originally had 6.42 gears . most tandem B42's had 7.49 gear ratios or 8.10 's and would do 52 miles an hour I'll be able to give more details once it's actually at my place. As of right now my plan is to make the truck either a rollback/ramp truck or maybe a tractor. As soon as it's home I'll update everyone. Depending on how the gas motor runs, I may stick to the original drivetrain. If not, then maybe a diesel/trans swap will be in the future. Quote Link to comment Share on other sites More sharing options...
terry Posted June 2, 2018 Share Posted June 2, 2018 That flathead engine is way underpowered for any kind of work truck. terry 1 Quote Link to comment Share on other sites More sharing options...
Johnny_B Posted June 3, 2018 Author Share Posted June 3, 2018 3 hours ago, terry said: That flathead engine is way underpowered for any kind of work truck. terry If I have my way, it'll be more for conversation and hauling my other true love to car show's. Quote Link to comment Share on other sites More sharing options...
j hancock Posted June 3, 2018 Share Posted June 3, 2018 The Mack looks to have good bones and sheet metal so you can make it into whatever you want. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
Hobert62 Posted June 3, 2018 Share Posted June 3, 2018 I put a single axle airliner air ride from a freightliner under my B and it drives and rides very nice. Mines a 4.30 gear ratio with my diesel and dueplex it maxes out at 65mph at 2300rpm with 12r 22.5 drive tires. Drives nice bobtailing but can definatly tell when it's loaded. You air ride should only take 1 airline to supply it going to the leveling valve then tee-ing off to each air bag. 1 Quote Link to comment Share on other sites More sharing options...
Johnny_B Posted June 3, 2018 Author Share Posted June 3, 2018 4 hours ago, Hobert62 said: I put a single axle airliner air ride from a freightliner under my B and it drives and rides very nice. Mines a 4.30 gear ratio with my diesel and dueplex it maxes out at 65mph at 2300rpm with 12r 22.5 drive tires. Drives nice bobtailing but can definatly tell when it's loaded. You air ride should only take 1 airline to supply it going to the leveling valve then tee-ing off to each air bag. Beautiful truck buddy. What engine are you running? I'm thinking more about ditching the gasser and swapping in something... Either staying true to the era or going newer... Quote Link to comment Share on other sites More sharing options...
Hobert62 Posted June 4, 2018 Share Posted June 4, 2018 Thanks it's the original "to the time anyway" 673 non turbo mack Mine being a b67 the motor leans to the right and is shoved back into the cab due to a 7" shorter hood. I bought it knowing very little about B models other then I like them. If mine would have the standard length hood and the engine standing straight up and down I'd prob look into sticking a 8.3 cummins in it. 1 Quote Link to comment Share on other sites More sharing options...
Johnny_B Posted September 6, 2018 Author Share Posted September 6, 2018 On 6/3/2018 at 12:00 PM, Hobert62 said: I put a single axle airliner air ride from a freightliner under my B and it drives and rides very nice. Mines a 4.30 gear ratio with my diesel and dueplex it maxes out at 65mph at 2300rpm with 12r 22.5 drive tires. Drives nice bobtailing but can definatly tell when it's loaded. You air ride should only take 1 airline to supply it going to the leveling valve then tee-ing off to each air bag. Revisiting this post now that it's finally home. The rear that was swapped in is an Eaton housing with 4:11's. Working on cleaning the mildew off of her yet and learning more and more about her. Got the 401 running. Mechanically it sounds quiet. The carb could definitely benefit from a rebuild though. Everything except the rear appears original to the truck. Quote Link to comment Share on other sites More sharing options...
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