Popular Post CaptainCrutch Posted March 26, 2019 Popular Post Share Posted March 26, 2019 I was searching through the internet when I found this beauty. It looks like a CA-31 cab on a B that doesn’t have the larger radiator. Just curious if anyone knows about it because it’s quite interesting. 3 Quote Who needs a back yard when you could have a Yard?! Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/ Share on other sites More sharing options...
JoeH Posted March 26, 2019 Share Posted March 26, 2019 It says diesel on the hood, but I don't know anything about B's Quote Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-419062 Share on other sites More sharing options...
j hancock Posted March 26, 2019 Share Posted March 26, 2019 The early B-70 series did not have the larger aluminum radiator so the standard B shell was used. The aluminum radiator came along to allow for higher HP engines to be properly cooled. Production numbers of the standard B shell 70 series, I would speculate, is pretty small. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-419066 Share on other sites More sharing options...
Phase 1 Posted March 26, 2019 Share Posted March 26, 2019 What makes it unusual with the small radiator is the L cab. I don't recall ever seeing that. Quote Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-419071 Share on other sites More sharing options...
h67st Posted March 26, 2019 Share Posted March 26, 2019 Tubeless tires too! That is unusual. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-419077 Share on other sites More sharing options...
CaptainCrutch Posted March 26, 2019 Author Share Posted March 26, 2019 Yes this is an incredibly unusual truck as before it was assumed that the smaller radiator somehow restricted the L cab from being used, but clearly that’s not the case. It’d also be interesting to learn how many of these were made with an L cab. It also begs the question to know if a CA-31 could be put on most other Bs, the only restriction being the size of the motor in relation to the hood of course. I personally prefer Bs with larger L cabs and if it could technically be available on most Bs then that would be a very interesting discovery. 1 Quote Who needs a back yard when you could have a Yard?! Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-419080 Share on other sites More sharing options...
Maddog13407 Posted March 26, 2019 Share Posted March 26, 2019 didn't the aluminum radiator shell come out around 56 57? or was it 58? when were tubeless tires first available?? Quote Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-419081 Share on other sites More sharing options...
j hancock Posted March 27, 2019 Share Posted March 27, 2019 Point of clarification. When I said B-70 series, I meant the 73, 75 and 77 trucks. The B-70 model gasoline equipped truck utilized the same dimensions of the B-61. The B-72 was gasoline powered and utilized the same hood with soft nose as the 73,75, 77. I think the aluminum radiator came out in 1957 and tubeless wheels were introduced in 1955. 2 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-419100 Share on other sites More sharing options...
CaptainCrutch Posted February 10, 2020 Author Share Posted February 10, 2020 Anyone know anything else about this truck? I can't even make out the model number on the hood. It looks like it's a diesel, due to that air cleaner, but I guess anything's possible. Honestly I feel like this is how the B models should have come, it'd certainly help with the space issues with the standard cab. Quote Who needs a back yard when you could have a Yard?! Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-442408 Share on other sites More sharing options...
mattb73lt Posted February 10, 2020 Share Posted February 10, 2020 I'd say it's a prototype, the engineering dep't. experimenting. There's some other pics(2) in the B Model books, showing a B-77 with the same serial number. In the second photo it sports a experimental cab with a one piece windshield. Someone told me that that was a fiberglass cab they were working on, but was never produced. Then there were the export B-81's that had integral sleeper cabs. I don't think any of those were offered on the domestic market. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-442413 Share on other sites More sharing options...
mattb73lt Posted February 10, 2020 Share Posted February 10, 2020 The one pictured here is a diesel. I'd say Cummins powered, B73/77, with that badging(that you can't read). Quote Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-442415 Share on other sites More sharing options...
BOB DINGSDALE Posted February 10, 2020 Share Posted February 10, 2020 quite a few western mack's in the b-73 range with that rad were made in calif for western market. but with the b model cab.i think when they put the bigger power in that rad they just made the core thicker. my friends ltl had a 200 cummin's with narrow core and i seen one with 300 cummin;s but thicker core. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/56372-unknown-b/#findComment-442425 Share on other sites More sharing options...
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