67RModel

I know one thing. Getting assassinated by a sniper while having a conversation about shooters is beyond crazy. Almost like it was planned to happen that way. I hope they can track down and investigate that kid who he was conversing with when he was killed to see if there was collusion with the shooter. Investigators say they found a 30-06 bolt action Mauser hunting rifle in woods nearby. Hmmm. The photos they put of the suspect ascending the stairs presumably to his shooting position doesn’t show a person packing the rifle they describe. I get he was wearing a backpack but I doubt even a break down Mauser action hunting rifle would fit in a normal school backpack. I’m skeptical the rifle they found in the woods was used in the shooting. I think it was placed there to throw off investigators and prolong the manhunt. Why take it with you while fleeing the campus and risk being seeing shlepping a 30-06 hunting rifle the whole way only to discard it once you get to cover? Hmmmm. if he wasn’t packing it in when the photos were taken how did it get up on the roof and who unlocked the doors for him? I doubt the college leaves access to building roofs unlocked for students to go sightseeing. How did he know Charlie would be setting up there and that location would be viable for a shot?

Lots of MS200 manuals and books on Ebay. If I remember correctly the Mack dealer parts system has not supported the midliner trucks for many years. Information on them is all but gone it seems. There is probably a source in France that knows about them and/or can get parts. If you can read/speak the language and do the digging.

Parts are unobtanium for it. Just sayin

Yea he should have stollen the correct duplex 🤣. However, he was not wrong. If you look at the ratios between a direct and over gear triplex the difference is not insignificant at all. If your truck had rears geared for one, then swapping to the opposite transmission would readily apparent.

I wouldn't say that. They just aren't progressive shifts from the next lower sequence of gears. There may be a time when you would be in 5th high cruising and come up on a scenario where you need to grab a slightly lower cog so you could move the auxiliary to direct or low split and then go from there. I think its just a preference if you want to change the main gear to 4th or the auxiliary to direct. But yes going up through the gears in a progressive manner those two are redundant.

Here is the ratio difference between a direct and overdrive triplex.

Yes I think so. If its a double over (TRT-720) then the main is direct in 4th and 5th main is a real small overdrive. Below is the ratios for a TRT-72 non overdrive triplex with the 5th main direct. The only OD is 5th high split because high split in the auxiliary is 0.85:1.

It will probably take some practice as it is somewhat counterintuitive. If your in say, 3rd hi split and want the next incremental gear (4th low split), you would, like you said, take the main out of third and let the rpms fall way down to get it into 4th. Then, immediately take the auxiliary out of high split and bring the engine rpms way back up to just under where you were before you shifted the main, and put the auxiliary into low split. Then the next would be a small, "normal" shift of the auxiliary to direct. Then again, a small, "normal" shift of the auxiliary to high split. Then it starts all over again my shifting the main from 4th with a big rpm fall to 5th then immediately following with a shift of the auxiliary, with a big rev match, from high split back to low split. I was always told to never shift both levers at the same time when learning, which is why there is a huge rpm gap when shifting just the main to the next higher gear but I have seen videos of old timers shifting them both at the same time and seemingly never missing a gear. It looks very laborsome shifting both at the same time as one hand pretty much has to be through the steering wheel with your wrist steadying the steering wheel and one palm on each lever. I'm sure it became second nature back in the day to the drivers who drove these things daily fully loaded. As an antique bobtail or hobby truck I think its easiest to leave the auxiliary in direct and shift the main as a normal 5 speed and then when you get to 5th if your on the open road and want top speed you can move the auxiliary to high split for cruising. Below is a good video of a guy shifting one, one lever at a time as I described. I believe he starts out with the main in 2nd as he is just bobtailing......

Someone with experience driving one can chime in but I think what you’re noticing is correct. Once you catch 4th like that you would immediately shift the auxiliary from hi spilt to low split which would bring you back to about 200-250 rpm lower than where you were before (3rd main, auxiliary hi split) you shifted into 4th…if you were loaded.

Impact of tariffs as it relates to class 8 truck production for US market..... US truck manufacturing is moving off-shore due to steep tariffs From the article specific to Mack: "Sweden’s Volvo and its Mack Trucks unit produce for the US market at plants in Dublin, Virginia, and Macungie, Pennsylvania. But the company says the cost math has turned against U.S. lines. In April, Volvo increased its planned Mexico plant investment by $300 million to $1 billion to support its U.S. operations."

Saw on Hibid. Not mine. Looks like its in Canada. Not sure how big of a PITA it is to get something like this across the border. 1962 Mack B61, sells as is | Live and Online Auctions on HiBid.com

Never in my life have I heard the term but apparently its a piece of oilfield equipment used in the natural gas fracking industry (huge business in this part of the country). It uses a high pressure triplex pump to inject an inert gas into a well bore to stop the flow of natural gas in an emergency. It "kills" the well. I hauled frac sand onto well pads for 2.5 years and never heard the term used. I guess its good I never heard the term because if that truck is needed you probably don't want to be around to witness it....

Did their price include installation or was that just for the part? Mack might be asking double what its worth. Get the part number off of it and see what one can be obtained for from an independent supplier.

Not sure what the end game here is but if you are looking for one to have a functional parking / emergency brake most guys abandon the hand brake and convert the brake chambers to spring chambers. If you need to have it for an exact nut/bolt restoration then that is a different story. Probably be hard to find or may have to buy a whole parts truck to get what you need. Do you have any photos of the one you need?