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4 hours ago, tjc transport said:

 73 was the change over year. i have seen early made 73's with steel "round" dash, and later builds with the plastic dash.
by 74 all macks i have ever seen had plastic dash.

I have seen early 73’s with the steel dash.  terry:MackLogo:

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13 hours ago, mrsmackpaul said:

According to Wiki Google, 1973 the cab was given a extra few inches (wouldn't mind a few extra inches myself 😉) and a plastic dash 

Mack R series - Wikipedia https://en.m.wikipedia.org/wiki/Mack_R_series

The big shock was it says the Superliner was released in 77

 

Paul

we call that a plus 3 cab over here paul,,,,,but in some applications,,,,they continued the straight cab,,,,i had an 87 U model that had the straight back,,,,was the first thing i noticed when i was looking at it for sale,,,,besides the fact it had factory AC,,power steering and a stereo woohoo 

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Bob

Legend has it the plus cab was a Australian invention, sort of

According to legend or urban myth as it's called today

Australia had trouble sourcing R model cabs so Mack in Australia got locally made fiberglass cabs of the R and F models 

To give a smooth inside and outside appearance the cabs were double skinned 

This resulted in the cabs been several inches longer than normal 

Apparently (like who would really know) this is were the plus 3 cab idea came from

I'm thinking it is more coincidence than what actually happened 

But it makes for a good yarn

 

Paul

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14 hours ago, tjc transport said:

 73 was the change over year. i have seen early made 73's with steel "round" dash, and later builds with the plastic dash.
by 74 all macks i have ever seen had plastic dash.

thanks for the memory refresh . I left Mack in '75 ; couldn't recollect  when green steel left and brown plastic came to be. another one of those change-over ; your on your own to figure out the mechanics of this new cab.  and Don't think the "new kid on the block "couldn't  just walk over to the well learned old timers and ask a question. they just laughed at you (me).they could resight every torque/ spec on a B by memory : a new R forget it. LOL

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