Rob

I'll look as I believe there is one in the "pile". Will be tomorrow night. Rob

Thanks Mike, mine do use the 5/8ths studs which are the same size as the front spiders. Rob

Hi Herb, no this one is cracked up between where the spring end box and tube meet from impact with something as the area is really pushed in too.

The guy has done some wonderful work on building up and turning down my obsolete S cams for the brakes. He also made me a mandrel to push the bushings from the brake adapters but I've not progressed to that point yet. They are to be replaced also so when all is said and done the driveline should be close to new. Have ordered all new slack adjusters too but haven't seen them as of yet. After hurting my back I've lost a little momentum but still progress slowly. All the brake parts and hardware are now clean and grease free and hopefully I'll get the bushings out, and ordered this week. Still haven't picked up my spokes, drums, and several other things that are at the blaster, but that stuff is done and being stored inside, and the engine/trans is still in the truck but close to ready to pull. The new wedges for the rears came in wrong and another set has been ordered. I have 5/8ths studs, and the received parts were for 3/4" studs so the holes were much too large. I also removed the rear crossmember from the frame. It is the only one I noticed with any rust buildup behind it. Best to get ahead of it now while the truck is apart cause it isn't going to correct itself. Progress is slow at this point but when you can't get out of bed to go to work, you kinda know you've overdone it. This was the first time in over 35 years that I've missed a day of work. Rob

Hi Herb, I'm going to assume this earlier depiction was inaccurate due to your experience. The six spoke design must be for strength I would think. Would you think the bearing sizes would be the same given an R model and B model if the suspension rating were the same? I have an R model with 34,000# suspension and no bends in the reservoir bowls so would like to keep them if useable. My 58 B model has a caved in bowl, but doesn't leak. Otherwise I was planning on knocking it back out sometime. Rob

I remember that post but thought it was a 3406 engine of some sort. Rob

Through the years I've read where the 34,000 pound tandem Mack rears were of the five spoke design, and the 38,000 pound rears had six spokes. Well, upon cleaning my B67 rears I noticed the stamping into the rear rear housing of SWDL56 denoting the series of suspension under the truck. This, suspension according to my service manual that resides right next to my bible, equates to a 34,000 pound rated suspension. I then march across the shop to look at another B61 series and it to is stamped SWD56, (minus the "L"). These too, according to the good book is also a 34,000# rears. Both of these have six spoke hubs so I'm thinking the earlier analogy of the number of spokes is misdirected to identification. Both of these trucks have the same brake setup installed with aluminum brake shoes and shoe mounting adapters. Even the same Mack part numbers are cast into the aluminum brake shoes. Both suspensions look identical to me so I can't figger our why the "L" designation is not stamped into the second trucks' axle housing. I know stranger things have been solved but I know both suspensions are original to their respective chassis. Does anyone know how wide an R model axle housing is and if it will readily go under a B series truck? I've never actually measured this dimension from axle tube end to axle tube end and do not have an R model apart. One of my B model has a busted housing and it has been poorly welded back up, (I didn't do it) and leaks. Rob

It be there. Haven't heard much outta you so thought you may have received some work. That's good. Rob

Never a good feeling. Sorry to hear this. Rob

Happy this has been so well received. I've had that chart many years. Rob

Yes they all do. But, some folks prefer 300 pound grain fed heffers. Rob

One of my Mack service manuals covers the two speed rears. It only covers Mack built differentials and nothing vendored. I would say Mack built one themselves if it's in this book. Rob

No Brakes but you don't necessarily need to stay with Mack for the brakes. Those spindles and brakes are used on a multitude of trucks. Pull the hubs and get the bearing numbers, and spindle numbers, then hit a "Hollander" manual for conversions. If the spindle is the same from another truck, the brakes will work. Be sure to change the treadle valve to something that will limit front brake application pressure or run a limiting valve. I've got a couple of 700 series parts needing to come this way. As you get closer in time, I'll let you know. Rob

Been several discussions lately about what engine will mate with what transmission so I'll post this chart to hopefully help someone in their quest: Rob SAE Flywheel Housings.pdf

Thanks for the reply. Both vendors I use had it listed as: N/A, or NLA. Appreciate the guidance. Rob

Do these exist any longer, or has RTV taken their place? Getting ready to pull the differentials to blast/clean/paint and wondering. Rob

There are many variants to the basic cab structure. My 56 B62 had an EN-464 series engine and does not have the air plenum hole in either the firewall, nor the cowl panel and did use an underhood air cleaner assembly. The Rt. side vent panel is conventional as with an air scoop, (door) as the driver's side is. My diesel B61 series trucks use a functional door under the air cleaner bracket to let air in. I don't have anything with hydraulic brakes and haven't looked close enough at a light duty, or fire apparatus truck to ascertain the difference in the floor pan. Rob

They tend to "find" things at significantly higher cost a couple days after they inform you they sold the last parts in existence you needed just last week. I've been very vocal to keep people from getting taken if I can help it; But only when I know for sure. The above example is from my own experience, with a strong second by another party. Rob

Hi there, the basic cab structure is virtually identical with minor differences. The main differences from the limited mental capacity I posses is the diesel powered trucks, (such as the B61 series) used an external mounted air cleaner where the gas powered trucks did not. There is a hole in the cowl panel, and the firewall for the ducting to pass through on the diesels. The gasoline powered trucks used an underhood mounted air cleaner and did not need this plumbing so there was no hole in the cowl panel, nor the firwall from what I've seen. Other than that there were minor differences but not really significant such as no series/parallel switch through the floor on a gasoline powered truck and some of the lighter varients such as B20, B30 series used hydraulic brakes so there were some plumbing differences. You could use a gasoline powered trucks cab on a diesel and vice versa with a little work. All the basic arrangements are near identical. Rob

Nothing wrong with that. I just vow to save as many as I can. Rob

With the exception of the cams back from the machine shop, and the associated bushings they will ride within, I've got all the brake stuff rounded up. New friction surfaces attached to the aluminum shoes in the rear, new brake hardware for the shoes, new 24/24 spring brake chambers for the drives, new quick release valves for these new chambers, new type 16 service chambers for the steer, new oil seals for all the hubs on the truck, new "Stemco" hubcaps for the steer, (in chrome shop now) new rim wedges for the rears, new studs, nuts, and retaining pins for the wheels. I've ordered the frame bolts and fasteners but have not received them yet. Also have not been able to pull the driveline out due to hurting my back but am feeling a little better, so getting back to it. Have had to stall picking my stuff up from the blaster too cause I sure as hell wasn't going to try to move any of that heavy stuff myself. I'm planning on hitting this one hard to get it through the shop as I need something to drive. Many things are progressing in the background and once I clear an obstacle, another pops up. I've met the challenge, (so far) and hope to keep progressing. Rob

You make a great choice. You will be hard pressed to find a B model with a 4-71 screamer engine unless someone particularly wanted it that way. I don't believe they were ever offered that way as built from Mack. I could be wrong however. Not all B model Mack trucks had air brakes. The lighter variants, (B-20, B30) series trucks used vacume over hydraulic brakes. The EN-401/402 series gasoline engines were very good in their respective timeframes but are obsolete to obtain parts for easily. Anything that has air brakes if operated commercially will require a CDL drivers license. If the truck is licensed as an antique it may not be required depending on local laws which seem to differ from state to state. Rob

Great engine that is hard on fuel, underpowered, and a bitch to get hard parts for, new. There are a few still out there but they are long obsolete. There have been recent posts on the board and a quick search will answer a lot of questions you present. I have one and like it a lot but I'm never far from the shop, (neither is a Pete, but that's a whole nother matter)............ Rob

There is more blue and black, in the IH red intermix formulas than Mack red which contains slightly more yellow also. Rob

Very smooth and fast if the pressure regulators are working correctly. Rob