heavyhauler Posted May 21, 2011 Share Posted May 21, 2011 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 Quote Link to comment Share on other sites More sharing options...
mackdaddy Posted May 21, 2011 Share Posted May 21, 2011 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,JohnJohn,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. Quote Link to comment Share on other sites More sharing options...
Superdog Posted May 21, 2011 Share Posted May 21, 2011 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. Quote Link to comment Share on other sites More sharing options...
heavyhauler Posted May 22, 2011 Author Share Posted May 22, 2011 OK, here are some pics including the rear end ratio. Quote Link to comment Share on other sites More sharing options...
heavyhauler Posted May 22, 2011 Author Share Posted May 22, 2011 Here are some more pics.John Quote Link to comment Share on other sites More sharing options...
rhasler Posted May 22, 2011 Share Posted May 22, 2011 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. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment Share on other sites More sharing options...
Mike Posted May 22, 2011 Share Posted May 22, 2011 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 Quote Link to comment Share on other sites More sharing options...
heavyhauler Posted May 22, 2011 Author Share Posted May 22, 2011 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 Quote Link to comment Share on other sites More sharing options...
fifth wheel Posted May 22, 2011 Share Posted May 22, 2011 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 Quote Link to comment Share on other sites More sharing options...
mackdaddy Posted May 22, 2011 Share Posted May 22, 2011 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.[/quMikr, 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? Quote Link to comment Share on other sites More sharing options...
heavyhauler Posted May 22, 2011 Author Share Posted May 22, 2011 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. Quote Link to comment Share on other sites More sharing options...
Red 460 Posted October 22, 2016 Share Posted October 22, 2016 (edited) I did buy the truck you are talking about the 1958 Mack B77 which as a 335 cummins in it Edited October 22, 2016 by Red 460 Quote Link to comment Share on other sites More sharing options...
Phase 1 Posted October 23, 2016 Share Posted October 23, 2016 Please tell us the whole story and everything about it. Quote Link to comment Share on other sites More sharing options...
Red 460 Posted October 23, 2016 Share Posted October 23, 2016 What would you like to know Quote Link to comment Share on other sites More sharing options...
Red 460 Posted October 25, 2016 Share Posted October 25, 2016 What would you like to know about my 1958 B77 I am new to this site Quote Link to comment Share on other sites More sharing options...
Popular Post hurstscrambler Posted October 25, 2016 Popular Post Share Posted October 25, 2016 We want to know anything and everything and we want pics! Seriously, we are truck nuts, so for some odd reason we want to know how you came to own it and what your plans are with it. Did I mention pics? Andy 3 Quote Link to comment Share on other sites More sharing options...
Red 460 Posted October 27, 2016 Share Posted October 27, 2016 (edited) 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 October 27, 2016 by Red 460 1 Quote Link to comment Share on other sites More sharing options...
j hancock Posted October 27, 2016 Share Posted October 27, 2016 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. Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
Brocky Posted October 27, 2016 Share Posted October 27, 2016 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. Quote Brocky Link to comment Share on other sites More sharing options...
Popular Post Red 460 Posted October 27, 2016 Popular Post Share Posted October 27, 2016 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 6 Quote Link to comment Share on other sites More sharing options...
Beaverdam Posted October 29, 2016 Share Posted October 29, 2016 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 1 Quote Link to comment Share on other sites More sharing options...
Red 460 Posted October 29, 2016 Share Posted October 29, 2016 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 Quote Link to comment Share on other sites More sharing options...
Red 460 Posted October 29, 2016 Share Posted October 29, 2016 I am looking for window crank parts for both doors for my L J cab ca any one help Quote Link to comment Share on other sites More sharing options...
Red 460 Posted October 29, 2016 Share Posted October 29, 2016 Thanks beaver dam my B77 as a 335 cummins with a quad pled 5x4 transmission in it Quote Link to comment Share on other sites More sharing options...
Beaverdam Posted October 29, 2016 Share Posted October 29, 2016 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 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.