steve s.

You are really asking a lot here. Over the 40 year time span you ask about, Mack made literally dozens of different transmissions. The number of speeds each transmission had just begins to tell the story. There were multiple gearboxes within each series of transmission, and often different series of transmissions offered in each truck model.

Glenn Akers often said that every time the injection pump came off the engine it needed to b re-timed. Are you going to have the pump redone and set up for 2100 rpm? or leave it as it is?

To fix my leaks I used a MIG welder. My tank had a bunch of tiny leaks under the tank straps. Of course the tank was off the truck and empty. I ran compressed air through the tank for a few minutes first. None of the small short welds made enough heat to do any harm. I kept putting air to into the tank after each spot was welded and eventually I found all of the pinholes and welded them up.

Sorry Larry, I don't have any information on your serial number. The Mack Museum could probably tell you more.

E- Mack diesel engine. T- trubocharged. A-single stage aftercooler. Z-maximum 10 grams per bhp/hr emissions level. Certified in California 1975-1976. 673- approximate engine displacement. C- variation of the basic engine unit, or(obsolete) emissions standard. Your engine was rated at 295 HP and governed at 1800 rpm. If there was a B in the engine number it would indicate a Dynatard engine brake.

The first question is what transmission do you have? Next question is which lever gets stuck in high? The H has no linkage for the shifters, just very long shift levers. Are your shift levers worn and sloppy?

Matt, that was me who spoke to you in Macungie. Your truck turned out great. All of your time and effort paid off in a big way. We are glad you were able to make it to the show and that your trip went well. We would be happy to have your "follow up" story on the B73 in Double Clutch. I recall that your B42 was a feature story in DC years ago, too. Steve

I have some old Brockway gas jobs with Fuller overdrive transmissions that use that same 5 speed pattern. It's a long way from 1st to 2nd. As for your other lever, I recall hearing old-timers refer to it as the "mud stick". It is a real lo hole that is really only meant for something like on/off road dump truck use. It was ok with a gas engine, and it might work well with your Cummins, but that transmission was never meant to be used with a Mack Thermodyne diesel. It just doesn't have the gear splits you'd need to stay in the narrow power band.

The short answer is no. But your 510 undoubtedly has a standard SAE flywheel housing. Do a google search for SAE sizes and measure yours. You probably won't have any trouble finding another transmission to bolt up, but the throw out bearing /collar might give you a bit of a challenge.

Since you had the air cleaner off with the truck out in the weather, you might have something other than a hydraulic lock. It is possible that some critter found your air intake to be a good place to stash seeds or nuts or something like that. As your truck sat idling it sucked them in and compressed them as much as it could until it killed the engine. I actually had a similar problem with a Thermodyne once. I would suggest that you pull the valve covers and check to see if your valves move freely (the ones that should be free). I found thin pancakes of cherry pits on top of the pistons in my engine, just enough to keep it from turning. Strange, but true. Good luck.

I just came across the receipt for the clutch I put in my B some years ago. The truck has a 673P and TRQ7220. The replacement part is identified as UQ M4106-15200VBS, reman clutch. It came from a Mack dealer, but I' not sure if it was a Mack part. I also looked up my Mack build sheet, and here are some numbers for the CL28 Clutch : assembly 101HBA 4116D, Clutch Disc Assy 101HBA 3144B-P9, clutch pressure plate 597HBA 416B Good luck!

According to my information your 128 is a 1960 and your 148 is a 1957. If you want to get the original build records, contact the Mack Trucks Historical Museum. Give them your serial numbers and a donation, and they will send you whatever they have on your trucks. It looks like you are pretty serious about the 148. Are you planning to keep the flathead 6 for power? My guess is that as an oil truck it was probably built with a straight 5 speed and a slow rear axle. I have an older 148 myself, and the 427 flathead is an excellent engine, but it doesn't like hills at all. It has an overdrive transmission and a 2 speed rear, which make it fun to drive, but it is still geared for about 52 mph.

It's always good the hear of another Brockway that has a chance at a new life. There is a very strong following for Brockways, and you will find a lot of helpful people once you get in touch with them. That FB place is where a lot of them hang out. You should plan right now to be in Homer NY the second Saturday in August for the 25th anniversary Brockway truck show. This event should be on every old truck fan's bucket list even if they don't own a Brockway. And if you do have a Brockway, there is no better place to be on that day. If you'd care to share your serial number, we can probably nail down the year of your truck. It looks like it has potential. There is a lot of interchangeability between the different models. many parts from an 88, 146, 147, and 148 among others will fit your truck. Even your fuel tanks are the same used on some larger models. Any more pictures?

There were two different ten speed transmissions available in the H63, the TR -67 series, and the TR-72 series. The 67 series would have two shift towers, the 72 series would have one shift tower, and a shaft that the other shifter pivots on.

What transmission do you have, or want? I have a triplex that would fit, but you have to have the right shift levers to make it work.