Mark T

Nice truck

Brocky, the Spencer he's associated with is big into Kenworth from in the '80s or '90s along with other models. There's some really nice trucks involved with them. You'd appreciate seeing any of them, but I don't ever remember seeing anything Mack. That RW fits in there, and I'm kinda hoping there'll be more.

😏 that might require it's own thread so we could examine the details wink wink

Bob 😠 you stop that poor chuck came up with a new buzz word recently saying people are "aroused" and he's a man not afraid to talk about erections. And don't forget about those dramatic clenched fists during his speeches. On top of all this, he probably has seperation anxiety from nancy.

Lot more ways to skin the cat back then. Now ? 8LL 10 13 or 18 and they all got one foot in the grave and the other on a bananna peel.

You could get a 15 in a direct or overdrive. The overdrive version had a much higher lowest gear than a direct 15. I would have to agree, in a truck made to go down the highway, an RTO 13 was better suited to a Cummins of that period. Fifteen was friendlier to different set ups. Like 10s and 15s of that time really worked on Cats. I can speak from experience, a 15 over behind a Maxidyne with a 4.17 axle....pretty sweet. Little less than ideal for crawl'n around , but on the blacktop it works better than comes to mind with a Maxidyne. Larry already has 4.10s in the truck. That's why I mentioned it. His Triplex with 4.10s ??? it'll be pretty much like having an RTO 13 speed if he does away with the 4 way.

It's easy to forget. Back then trucks had lot slower axles. Like a truck with a 15 over might have had a 4.6 axle and usually you didn't use deep reduction as often as when axles got faster and around the time they became the norm, the knobs with the blue button were around and it was simple to start out in deep reduction.

A 15 over is a highway transmission. Couple lower than a ten, and at the time a realistic overgear to make in a lever shift. If you were geared between 3.5 and 4.3 usually 1 2 3 and four in deep reduction, you could go to 4th in regular low range. A direct 15 was quite a bit lower than an RTO 13 and made sense if you had a faster geared truck back then.

Lots of overgear in that transmission

No doubt. I think it's cool seeing some of these upgrades and referbs guys are doing now. Lots of them have been done in the past, but now things that are available that didn't exist years back ??? new twist on things. I think it's interesting.

300 4.17s and a 15 over ??? they work. Lug'n mid 70 some thousand pounds.... they work. 15 has more overgear than an old RTO 13 and in direct with 4.10s still would go in the low 60s.

Still easy to get stuff now to get fresh air to the tip fan without the Mack air cleaner. Duct it from somewhere that was never thought about years ago without spending days making stuff.

There's so much more available now for filters. Geeze, if you have 4.10s ? an old 15 over (like an RTO12515) would be a great choice. a hair more overgear than the Triplex

3.55s with the Triplex ? that's pretty fast even with 20 inch rubber. If I'm not mistaken the Triplex has a little tiny overgear. So even of you didn't cruise in overdrive, 3.55s are still pretty fast in direct (I'd guess well into the 70s)

I would think in 2025 it wouldn't be very difficult to fit some form of K & N filter or something like that on the tip fan and duct it out from under the hood somehow. An air cleaner for the engine wouldn't need to be much bigger than an old oil bath or something as far as real estate in the aircleaner area. They make a lot more stuff now after the diesel pickup craze than back when this was a more popular swap.

Nice Superliner. Can't help but wonder if that'll spark some interest with Spencer ???? They seem to have a knack for locating hiden gems, and I like the idea of them getting into Macks. Not out of the question to see one of those bunks show up for sale some place or on here from time to time.

Ahhhh..... memories of ol uncle bosie. Those zany cannibals alway up to some kinda mischief.

One of the problems with the smaller Mack Triplex or Quadraplex with biger engine was keeping tho oil cool. Once they spent more time in overdrive, oil temp. got to being an issue. If you have a Triplex and a four way behind it ??? you're double overdrive. That bigger engine, likely you'll need a faster axle, and skip the four way. Unless I'm reading wrong

Creeps up on ya, but you realize it all at some point.

Wonder if everyone realizes you need to click on the picture to see them all. Took me a few seconds to remember Other Dog posting pictures like that.

When I was around 20, I used to get stuck doing all that. Got that I could cut motor mounts out and usually not burn anything. Lot's of wet rags.... then you'd get to crawl under and lay in all that (lol) At the time ??? I didn't know any better. I swapped a Fuller 9 speed in one of my CHs one night (no clutch) in 5 hours. It was a reman that had an issue with the synchro. Started when it got in @4 and was test driving @ 9. I ain't got it in me anymore. The CHs were a piece of cake after fight'n old Rs in the past.

Eh....he was happy (lol) My own, I had everything ( I was aware of) in stock. Flywheel, cluthch kit for the Fullers, OTC jack.

Here's a handy little thing I welded up from a grade 8 half inch bolt and an old push in typ adjuster. Bolt it on the cover in place of the push in adjuster and then you can use something 3/4" to get the ring moving sometimes when they're putting up a fight. Sometimes it works, sometimes it's time for a new clutch.

Did an R Model in 6 hours once. Guy was a cheapskate. Just replaced the clutch.

Lots of wet rags too 😂