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I have been off the chats on B model for some time, but I am interested in rebuilding one in my retirement.  Iput myself through University hauling logs out of the mountains of British Columbia, so I have a soft spot (and a callused ass) for these old beasts.  There was a lot of info on cab dimensions, styles etc on a website www.oldmacksrus . but I can't find it.  DOes anyone know where all those production stats went??  Many thanks,  Barry

Thanks Glenn. "...all the parts" kind of scares me though.

cheers, BArry

I am thinking of restoring a Mack B model that has plunger brakes. I would like to convert it to "S" cams and would like to know if that is a BIG job? I actually want to work the truck when she is restored. MAny thanks.

I don't know if you are still referring back to this post, but a good many years ago I was driving a B61 hauling logs out of the mountains on the West coast. My boss & I put the truck in the shed and mounted spring brakes using offsets. Monday morning They worked like a damn along the highway and up the mountain. Loaded her up and started down to the mainline. Withing 100 yards I couldn't keep air up, so I stopped and all four air lines were broken off right at the spring brake. I had to put rivets in the air lines and cap them so I could get down the mountain watering the trailer brakes. Make sure you take in to account the position of the frame & axle under load!!!

cheers

If you are trying to downshift, you shouldn't be using a Jake - you want to raise the RPM's, not lower them. Use the clutch to slip it out of the overdrive, raise the RPM's about 400 and if you hold the gear lightly against the direct gear, it will just slip in - clutch or no clutch. You can go from 3rd direct to 2nd over the same way - slip both sticks out, hold them with slight pressure against the target gears, raise the RPM's and both sticks will slip in (called split shifting). I have only driven the quad box in a B Mack, so my RPM range might be off for a Duplex. But the quad transmission would go from 1st under to 4th over shifting on RPM's only-no clutch.

it looks to be a six speed which has a 1 to 1 last hole. if you can post the 11kb number that is on the case then we can identify it.

The KB #'s are on the right rear of the pic of the stick mounts.

408 KBA ?32

408 KB 57

RC

Does that help identify it.

cheers

barry

Good Morning All,

Can anyone tell me why on my R-400 there's a dash tag that says " Do not use 1st or 2nd underdrive in the aux. trans. when in 5th in the main trans". It is a quadraplex 18 spd.. Is the jump from 4th direct to 5th direct possible without taking a nap waiting to get into 5th gear ?. Just a question from a Roadranger person, never owned a married Mack type transmission. The only trans. iv'e had that even comes close is a 5X4 in a 1974 Paystar Tri Axle log truck with a 400 Cummins. Thanx E.S.D.

The usual shifting sequence was to go 4th direct - 4th over - 5th over. That works best with the ratios. If you hit a rise, you can drop down one on the aux.; less of a drop than going back to 4th over. have fun - that is the sweetest trans I have ever driven without using a clutch.

cheers

All the big block Cummins motors-H,NH,NTC,NTA are the same size externally, and will fit, may be some minor differences in accessories, that's all.

Thanks for the help. While you are thinking about it, do you think a TRT trans and camel back rears would stand up to 400 hp. In the old days they always said the camelbacks were indestructible - but they hadn't seen 400+ hp in those days either. I have driven a quad box with NTC 335 hp, so I know the drive line will take that much. Thanks again

barry

Does anyone know if an NTC cummins block will drop-in to an old mack. It is a B735 with an NH 220 hp Cummins inher now. I think all these blocks were the 855 c.i. block so I thought it might be an easy re-power without moving the firewall. Any info would be appreciated.

barry

Does anyone have any idea if I could get a Cummins NTC (855 block) into a Mack B735??? It currently has an NT 220 hp engine behind a TRT transmission., but I need more power. I was hoping to re-ower with a big cam 400. I don't want to have to move the firewall. Thanks for any help, or ideas. cheers, barry

hi, i am the new kid on the block i love old internationals and ford truck

Rookie, that is admitting blasphemy on this site. Hang around though, you'll see the error of your ways.

blegh