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I am going to buy a Mack B-77 with a 335 Cummins mated to a quadraplex trans and it looks like a 5:08 rear end ratio but that may not be a Mack rear end? I will post pictures but I do not have much info on this very rare Mack with serial number B-77LS1004. I would appreciate any comments or info. Mack made 113 units between 1958-64 but I am not sure why they made this model. Would not a B-73 or B-75 do the job? I will call the Mack Museum on Monday AM to see what they have on the truck but I would appreciate any and all comments.

Best regards,

John

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I am going to buy a Mack B-77 with a 335 Cummins mated to a quadraplex trans and it looks like a 5:08 rear end ratio but that may not be a Mack rear end? I will post pictures but I do not have much info on this very rare Mack with serial number B-77LS1004. I would appreciate any comments or info. Mack made 113 units between 1958-64 but I am not sure why they made this model. Would not a B-73 or B-75 do the job? I will call the Mack Museum on Monday AM to see what they have on the truck but I would appreciate any and all comments.

Best regards,

John

John,

The B-77 came with either a cummins supercharged or turboed like the 335. Dave Strickland of VA has the finest example of a B-77 with a charger motor. I have one with the early 335 and big 590 turbo. As for the rear ratio that would be a later 50's drop in as I believe 5.77 was the fastest in the early models. I keep thinking that it was 5.13 but maybe there was a 5.08. But if it is a drop in most definetly Mack. It is a single axle? and the serial number would have be believe it was one of the earliest of that model built.

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John,

Is the engine original??It was always my understanding that the B-77's had the supercharged engine like Dan said,and the B-773's had the 335.

5:08 is a Mack ratio,my '58 B-73 and 'one of my '60 B-61's both have 5:08's.

Please post some pics ASAP,can't wait to see it.

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OK, here are some pics including the rear end ratio.

post-1471-0-11066800-1306027022_thumb.jp

post-1471-0-57023400-1306027067_thumb.jp

post-1471-0-79711600-1306027130_thumb.jp

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Judging by the way the numbers for the ratio are stamped I would say that the rear axle ratio was changed at some point. It looks to me like the original numbers were crossed out and the new numbers were stamped below. Definitely a Mack rear axle.

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Hey one good thing about your Mack is......it's on top. That's a good bulldog. Stay on top baby stay on top.

mike

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We could not figure out what the real rear end ratio was because of the two stamps on the axle housing but it would seem to be 5:08. That would put top speed at about 70mph+?

John

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I figure with; 41" diameter tires (22" - 24.5")

5.08 ratio

Quad direct @2100 RPM appx.65 MPH, @1600 RPM 49 MPH

Quad over @2100 RPM appx.82 MPH, @1600 RPM 63 MPH

Either way a good setup.

A cummins will drop RPM's slower than a mack engine this makes for smooth shifting.

FW

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John,

Is the engine original??It was always my understanding that the B-77's had the supercharged engine like Dan said,and the B-773's had the 335.

5:08 is a Mack ratio,my '58 B-73 and 'one of my '60 B-61's both have 5:08's.

Please post some pics ASAP,can't wait to see it.

[/qu

Mikr, you got me on that one........ I forgot the 3 meaning turbocharged. I had a G-77 and it had a unique frame modification at the factory so that the charger would sit down in it.

It looks like a treasure chest inside that garage? Why not fix up that LT first?

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That is a good question. I am rethinking a few things and I may alter the bid. The LT is a good ole truck-spent most of its years on the pipelines in Washington state. There are 2 winches on the truck and it is powered by a 275 Cummins with a quadraplex and 44,000 rears. As for the B-77, I believe the engine is original and I'll confirm that just as soon as I get the build sheet from the Mack Museum. In any event, I will keep you posted.

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I did buy the truck you are talking about the 1958 Mack B77 which as a 335 cummins in it

Edited by Red 460

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What would you like to know about my 1958 B77 I am new to this site 

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Well I bought it from a friend of a friend and I when to go a see it and it runs he asked me if I could run a 2stick and I laughed so I took it for a run and it shifted well so I bought it I bought a take of Mack air ride suspension and single axle and this truck is going to pull my travel trailer when it is done I plan to have a really proud looking Mack B77 when I am done but I am finding it hard to find parts for the LJ cab maybe you people can help I don't know how to put pictures on this I am selling the set of drive axles and camel back susp as one piece do you know any one that would like this set

Edited by Red 460
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What sort of parts do you need?  

I have a pair of floor/door thresholds and a lower cab back panel that were reproduced years ago. 

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11 hours ago, Red 460 said:

I don't know how to put pictures on

After typing in your text go to the bottom of the reply box and click on "choose files". Go to your picture library, highlight the photo you want and click on open. After it downloads at the bottom click on insert. It is easy just play with it a little.

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That will be a nice truck I have a B773Ls w/335 turbo cummins but some one but A Rto-9513 roadranger in it I to am new to the site an have already gained a wealth of information on finding parts I will be posting new picture soon on my restoration good luck on that Alsome truck

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Ok I will give it a go and I am looking for B77 badging and mirror brackets for a LJ cab and other parts this is my project 

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I am looking for window crank parts for both doors for my L J cab ca any one help 

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Thanks beaver dam my B77 as a 335 cummins with a quad pled 5x4 transmission in it

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I called watts Mack the other day the man I talked to told me he thought they had some b77 badges I haven't called back yet to see 

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