Jump to content


Welcome to BigMackTrucks.com

Welcome to BigMackTrucks.com, the best resource on the Internet for Antique, Classic and Modern Mack Trucks!  

 

Please login or register to take advantage of everything BMT has to offer.  Memberships are Free and offer many benefits:

 

  • Start new topics and reply to others
  • Subscribe to topics and forums to get automatic updates
  • Showcase your trucks in our Garage
  • Photo Gallery, Member Blogs and much more...
  • Add events to our community calendar
  • Create your own profile and make new friends
  • Customize your experience!
  • Mack Dealer and Corporate personnel can contact the ADMIN after registration for access to the Dealer Forums.

If you are having trouble logging in or haven't received your validation email, you can post as a guest in the Guest Forum.


login  register
Guest Message by DevFuse
 

Photo

B-model Contour Cab


  • Please log in to reply
7 replies to this topic

#1 OFFLINE   LocomotiveBreath

LocomotiveBreath

    BMT Veteran VIP

  • Big Dog
  • PipPipPipPipPipPipPipPip
  • 165 posts
  • Make:Mack
  • Model:B20
  • Year:1953

Posted 06 October 2008 - 12:54 AM

How can you tell the difference in the contour cab vs. the std. cab ?

#2 OFFLINE   vanscottbuilders

vanscottbuilders

    BMT Forum Guru

  • Pedigreed Bulldog
  • PipPipPipPipPipPipPipPipPip
  • 656 posts
  • Location:Fishers, NY
  • Make:Mack
  • Model:B73ST
  • Year:1957

Posted 06 October 2008 - 01:34 PM

If you are a big guy - get in the truck.
You will know immediately!!

Seriously, the concave cab was built to allow a longer trailer
to legally be pulled in the Eastern states, where length laws
were more restrictive than Western states.
The concave back panel is very obvious by its' curvature that
extends into the cab area, and therefore makes the cab interior
a little smaller. (about 6 or 8 inches smaller)
The concave panel was available as an option on most B models,
but was most common on the B-67 and the other shorter length
tractors.
A quick look will readily reveal a straight back panel vs. the concave panel.
Hope this helps.
Paul Van Scott

#3 OFFLINE   LocomotiveBreath

LocomotiveBreath

    BMT Veteran VIP

  • Big Dog
  • PipPipPipPipPipPipPipPip
  • 165 posts
  • Make:Mack
  • Model:B20
  • Year:1953

Posted 06 October 2008 - 02:46 PM

I was looking at B67 pictures trying to see the difference in my B20's cab and could not tell much from the photos, most photos of them are from the front. I'm 6ft. / 240 lbs. and the B20 cab is kinda cozy. Is the difference in the curvature of the sides where it makes the transition to the back of the cab?

#4 OFFLINE   sbrem

sbrem

    BMT Veteran VIP

  • Big Dog
  • PipPipPipPipPipPipPipPip
  • 174 posts
  • Location:Guilford Vermont
  • Make:Mack
  • Model:B70, B61
  • Year:1957, 1965

Posted 06 October 2008 - 04:56 PM

Take a look at this picture. The green one has the contour cab and the blue one has the regular cab
Posted Image

#5 OFFLINE   LocomotiveBreath

LocomotiveBreath

    BMT Veteran VIP

  • Big Dog
  • PipPipPipPipPipPipPipPip
  • 165 posts
  • Make:Mack
  • Model:B20
  • Year:1953

Posted 06 October 2008 - 10:31 PM

I see said the blind man, a picture is truly worth a thousand words. I appreciate everyones help.

I'm getting ready to order a complete glass kit for my 1953 standard cab B20 from this place.

http://www.classicflatglass.com

Is the standard cab designated a CA30 model?

#6 OFFLINE   vanscottbuilders

vanscottbuilders

    BMT Forum Guru

  • Pedigreed Bulldog
  • PipPipPipPipPipPipPipPipPip
  • 656 posts
  • Location:Fishers, NY
  • Make:Mack
  • Model:B73ST
  • Year:1957

Posted 08 October 2008 - 07:35 PM

Pretty interesting picture -
I don't think I have ever looked at both cab backs
in the same photo before.
Everyone else might already know this, but I never realized that
the window in the concave panel is actually mounted
higher in the cab than the flat back window. (Look at the
body lines and seam roll between the roof panel and the cab corner,
and compare the two trucks.)
Thanks for posting the picture.
Paul Van Scott

#7 OFFLINE   theakerstwo

theakerstwo

    BMT Certified Know-It-All!

  • Pedigreed Bulldog
  • PipPipPipPipPipPipPipPipPipPip
  • 2,390 posts
  • Location:mounds okla
  • Make:mack
  • Model:b61
  • Year:1957

Posted 08 October 2008 - 10:32 PM

Paul i am the same way i never knew there was a difference and that looks out of place next to the other cab. glenn
glenn akers

#8 OFFLINE   Rob

Rob

    Bloated Dieselholic

  • Pedigreed Bulldog
  • PipPipPipPipPipPipPipPipPipPip
  • 10,191 posts
  • Location:Mack Paradise-Farmington, Illinois
  • Make:Mack
  • Model:A-40H, B-61T, B-61ST, B-67ST, B-61S, RL-797LST, RL-797LST, RL-755L, R795, R612ST
  • Year:1951 1957 1958 1962 1964 1973 1974 1978 1977 1980

Posted 08 October 2008 - 11:38 PM

Pretty interesting picture -
I don't think I have ever looked at both cab backs
in the same photo before.
Everyone else might already know this, but I never realized that
the window in the concave panel is actually mounted
higher in the cab than the flat back window. (Look at the
body lines and seam roll between the roof panel and the cab corner,
and compare the two trucks.)
Thanks for posting the picture.
Paul Van Scott


I've driven both and the concave back cab is easier to see out of to the rear for me. This is because of the elevation of the glass as you mention. I have to "duck" a little bit to comfortably view out the rear window of a standard cab. The one I drove was a B65 with a wrecker bed installed. You had to keep a eye on the winch drum to ensure proper spooling of the cable until tension took over.

Rob

Going through life knowing considerably more about nothing than the next person.

ParadeRain.gif
Raining on your parade





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users