Geoff Weeks

If you look at the White, the steer tires stick out further than the doors on the conventional, on the cabover the doors are out further than the wheel. I drove the later Volvo-Whites. Some narrowing but not much. Much more room inside when compared to a Pete or R model cab

Ok, you don't know how many people I have run into, that say "its a 8 bolt, so will bolt right on" not realizing that every PTO is more or less custom to the application. Yeah, most Eaton roadranger PTO's will interchange (speed may change some). If your guy is a PTO specialist, than he will know what is needed.

You do realize that all 6 bolt and all 8 bolt PTO's are not the same? the input gear on the PTO must match the PTO gear in the transmission and there are 100's of different gears. I highly doubt the Mack and Eaton share the same pitch gear. Get with a PTO shop and see if it is cheaper to re-gear yours or start new. It is highly unlikely that both transmission PTO gears turn at the same speed compared to engine speed. If your present one is driven off the rear box on the Mack, it will not be anywhere near correct for the front countershaft speed.

buyer may have paid more, but the seller didn't get it, so is a moot point. If the truck in question was in THAT auction, it might bring more than the KW, but sold in a private sale, alone I don't think you'll see $15k. Most assuredly not $25k-$30k. The KW was the closest in spec's and year to the truck in question, had a generator and living 1/4's which may or may not be something of value to the buyer.

no chance of me bidding, just the one vehicle in the lot that raised my interest, that is all

My pick would have been the 6-71 powered motor coach.

Another thing that gets lost when people see what auction results bring. That was at a specialty auction with enough vehicles and other stuff to bring in collectors. That is not the same as trying to sell a single vehicle. True, you can consign to an auction somewhere, but you have to bring it there, and hope that the rest of the stuff generates enough interest to bring in the "right" buyers. Otherwise it may bring far less than you expect. Many of those (all?) were not road registered so would have to be trucked to an auction if sold individually. Big enough collection to have an auction of its own, can make all the difference in price.

I think some see the quad headlights, small sleeper and twin sticks, and go all to pieces. I was surprised on what the LTL brought, but it was a nice truck in good condition, with all the modern powertrain.

closest analogous truck didn't break the $10g's, more than I thought but less than others thought. I guess we are all wrong. https://bids.aumannauctions.com/auctions/40500/lot/6124817-1966-kenworth-w925a

Yeah, well he had to do it in snow!

boy, did we get "off in the weeds" on this thread.

I just put my numbers into Spicer's driveshaft calculator and it spits out what I need to know. Critical and 1/2 true critical.

Got to be careful not to run driveshaft speeds into critical range when using a lot of OD in the front and high reduction in the back. Ran into that a while back with my K-7, had to redesign the driveshaft to keep it out of critical.

That is the factory correct way, PDL only in low range, locked out in high range. Since mine was a retrofit, I could do as I wanted. I get PDL in both ranges. Mine are electric over air, not full air, where the air lines go up the stick and then back down the the frame, back to the rears, That can be the cause of some slow shifts. Mine has full air pressure to an electric solenoid on the frame and electric on the stick that controls both the solenoid and the speedo correction.

They don't have to, In fact 3 spd rears, were one in low, one in high for intermediate speed. Just have to be careful when you lock the PDL that they are both on the same page. Mine are plumbed to shift together, both on the same air feed, so they self sync more or less. I love the set-up, but don't often split many gears, I use it more as another range shift. I start in low, run though 10th hole (15 speed) and then downshift the main and up shift the rear for the remaining gears. I tend not to run max speed in low as it drives the driveshaft into or close to critical speed, and there is nothing to be gained by doing so. 15 in deep reduction, rear in low and you almost don't need a clutch!

My CPL 676 with a little extra fuel would make 26 psi boost all day long and hit 30 on a good day. Factory it is 400, I don't know what it was putting out when I had it.

No, I fixed it, that is the problem. I built my own DT402's from cores. Still in my Marmon.

We really need a whole lot more info to be of help. How the PTO is set up and what engine exactly is in it. I know we got a bit off topic, but there are all points to consider.

Believe it or not, Eaton 2spd cores can (or could a few years ago) cheaper than used single speed drop-ins. 2Spd's have bolt on ring gears so easy to re-ratio. None of it is helpful if it is on Mack rears.

Found this: If you need to drive off the rear case PTO and select front trans ratio to get the speed you need, the Eaton may be a problem in matching the PTO needs to the available options.

You have a lot to weigh and make choices. From the sounds of it this is your sole means of support. Down time can bankrupt a business or individual. Can you rent a truck to service your customer base? If not down time may trump other considerations. Always faster to go back "like for like". I have no info/thoughts on the Mack 18 as I have no experience with them. In an ideal world, building the truck from a clean sheet of paper, I would have 2spd rears and a 13 up front. Keeps the overall reduction at the back and allows for a smaller and less stressed driveline. That said you have to start with what you have. Even the most simple looking swap is going to kill you on the details, new PTO, has to match the operating range of what you have now. It will be in a different locale and require building a driveline for unless all hydraulic. Main driveline will require replacement of at least a section, and then there are the controls and air plumbing. All totally do able, but all take time and most can't be started until the lump of the transmission is in place. The are downtime killers. It may be desirable in the long run to do the swap, but unaffordable in terms of downtime at present. In an ideal world, you'd have a parts truck just like yours with the Eaton that you could rob all the little in consequential, but time consuming parts you need to buy to complete the change over. everything always takes much longer than planned. one little part that is un-obtainable can grind the whole operation to a standstill until found. quick search online shows that trans has PTO on both the front and rear case, the Eaton will only have on the front case (in most all of them) and so you are limited to a single speed from the engine, if you need more than you'll need a multi speed PTO $$$$

This post is where the confusion starts!

here are eaton's ratios https://www.eaton.com/content/dam/eaton/products/transmissions/vehicle-transmissions/eaton-transmission-specifications-catalog-en-us.pdf

Eaton ratios are available online, depends on the age of the transmission in question. Starting in the low end will unlikely be a problem, top speed may be depending on rear ratio. PTO is going to have to be changed out, and matched to needed speed. Not going to be a cheap, swap.

I'd say #5 is the only one that is a close enough analogy to have any meaning. The rest are not at all in the same "class". They have, wrecker bed, to boost the value, or have been updated considerably. Hard to find something that directly correlates