Macktruckman

I wish I could stick that 14909 in there and not touch the pump

Ok. I have done business with Thompson in Tulsa several times. They would be where I would go. Was a guy there named Paul and he’s sharp.

Or anyone who can direct me for that matter and thank all of you guys again

Rob, where do I find the specs and directions for pump adjustments?

Small world

51 highway. That cannery is not far from westville. Mine and my wife’s family farmed long before I was born and they both took produce to that cannery

Lol. There ya go superdog you know the kind of the roads I have to travel then. Kinda sounds like highway 10 out of tahlequah

I have a sister in Norman. They don’t have hills. I’m about 30 minutes from the Arkansas line so we’re in the foothills of the ozarks here. This is the only truck I’ve had with the tip turbine and the water/air charge cooler. So I need to pull that aluminum top off and clean the back side of the cooler fins?

As for the cooler, I had it apart about a year ago to replace the gaskets. It was losing boost. So it got a good cleaning last year.

Rob I don’t wanna lose the maxidyne grunt. It crawls out of the gravel pit loaded heavy with authority. Lol if calibration would cause me to lose the 1,000-1200 rpm power, then that might not be for me. 1st through 4th I’m happy with. It’s long between 4 and 5 and an overdrive would be nice. So I would have to recalibrate the pump to use this 9LL? Couldn’t leave it a maxidyne? thank you

I’m 50 miles east of Tulsa and a little ways west of Siloam springs Arkansas off 412. Rose Oklahoma near a little town called locust grove.

If I didn’t live in the hills and if the speed limit on the highways were still 55mph, I wouldn’t touch it. It would work great. The mechanic that’s helping me now is good. He’s great on Cummins and pt pumps. We just haven’t ever tinkered with the Mack pumps. I’m not opposed to that and I’m the only driver of this truck. But I also need it to be reliable and live. So I’m not interested in tinkering with the pump if it will cause problems down the road

Ok I do know the maxitorque has triple countershafts and I like the transmission. We’ve had very good luck with them. But the others are in dumps and mixers. Short haul trucks. This is a tractor. It does not have dynatard or jakes. Never had that on any. So I don’t have a jake available to me. The 9LL is laying here so it would be a very cheap swap. It has a.73 od vs the direct in the Mack. Should bring highway rpms down a bit. The 9LL also has low gears, at least one even lower than the 107 in the truck now, and 3 reverses. By comparing ratio charts side by side the Eaton also has a gear or two between what is 4 and direct in the 107. Rob, I’m a little ignorant about the different engine codes. What is the ETAZ673A and is it still a maxidyne? I haven’t messed with this pump. It doesn’t smoke excessively. I believe that the puff limiter is disabled. I love the low end grunt these have for crawling around off-road and for the many gravel backroads. But for highway use it could use another gear before direct and after the current 4th gear for hills and then an overdrive for tooling down the long stretches. Thank you guys again

Thank you guys for the suggestions. I’m having difficulty trying to post now for some reason

I have a 1978 R685ST with a 285 maxidyne and the 2 stick 6 speed with 4.17 rears and tall 24.5’s. Truck is getting a new cab this week and paint job. Old cab is rusted out badly. I have an Eaton RTO14909MLL from a wrecked mixer truck with E7, I think has mounts that will work. Now would be the time to swap transmissions if I want. I was thinking it would help lower my rpm at highway speed and give me a little more top end and maybe help me out on hills. I live in an area with lots of hills. Pull a lowboy to move my equipment and pull an end dump. I like the 2 stick but the gap from 4 to 5 is pretty big with all the hills and I can only get about 60 mph or so on flat ground to the floor tached out. Transmissions look to be within 1”-2” of each other in length. U joints different. Would it be worthwhile to swap? Since the cab is off anyway thank you

I have a 1978 R685ST with a 285 maxidyne and the 2 stick 6 speed with 4.17 rears and tall 24.5’s. Truck is getting a new cab this week and paint job. Old cab is rusted out badly. I have an Eaton RTO14909MLL from a wrecked mixer truck with E7, I think has mounts that will work. Now would be the time to swap transmissions if I want. I was thinking it would help lower my rpm at highway speed and give me a little more top end and maybe help me out on hills. I live in an area with lots of hills. Pull a lowboy to move my equipment and pull an end dump. I like the 2 stick but the gap from 4 to 5 is pretty big with all the hills and I can only get about 60 mph or so on flat ground to the floor tached out. Transmissions look to be within 1”-2” of each other in length. U joints different. Would it be worthwhile to swap? Since the cab is off anyway thank you