sbrem

It's not a Superliner, but here is a link to another cool Mack tanker. B model tanker

I'm almost positive it is a triplex. I think who ever posted that video on youtube just mis titled it as a quad box.

Here is another video that he did

I have seen that video before, but it never hurts to see it again. Thanks for posting it .That is Freightrain from this forum. It is a triplex.

Very cool truck You don't see a U done up nice like that very often

If you look at some of the pictures on his web site, he does get into some tight places with it. I don't know how he does it, but he finds a way. I have seen the truck in person at a truck show, and its VERY cool looking, but probably not the most practical thing. Here is a link to the build up of his truck.

I have decided to use 80-90. Thanks for the help everyone.

Thanks for the help. As to the 8 speed we have 4 dump trucks (not Macks) where I work with Eaton/Fuller 8LLs and they seem to be real reliable. The trucks don't have many miles on them for their age, but what miles they have are hard miles. So I think you will most likely have good luck with yours.

I agree. The Petes are a great over the road truck, but I would take a Mack in the dirt anyday!

Cool. Thanks again for the help. I guess gear lube it is. Another related question that I'm still unsure of that you probably can help with: In my 1956 owners manual it lists 3 different types of gear oil GO-A (straight-Mineral Gear oil) which is what they say to use in most transmissions, auxiliarys and some rear ends, GO-B (All-Purpose gear oil) recommended in 1 transmission, and GO-C (extreme-Pressure Gear oil) recommended in 1 transmission and some rear ends. I can try to scan the pages later if seeing it would be of help to you. So I guess my question is what gear oil today would be closest to the straight-Mineral as opposed to the all purpose gear oil.(I don't even know what the difference between the 2 is ) I don't care if it is synthetic or not as long as it lubricates properly. To be honest for the amount I'll be using they truck any type of oil probably would be fine Again, I'm not questioning what you say at all, I'm just trying to educate myself a little better. Thanks again

I'm really sorry if I came across that way, as it wasn't my intention at all. My mind is not made up. It will be a while before I get to changing the fluid anyway and I'm hearing more then one opinion on what to use, so I'm just trying to get all the information before I go and buy the wrong thing. And I greatly appreaciate you using your time to help me out. Again, I'm sorry if I came across wrong.

Thanks for the link. Very helpfull

I have heard that 90 wt mineral gear oil (which is what Mack used to recommend back when these trucks were new) and 50 wt engine oil are the same viscosity, but the newer (non mineral?) gear oils are too thick and, as you said, don't properly lubricate the needle bearings.

I would be interested in some as well for my B70

I voted for the 50's and 60's as I like both the B's and the R/U/DMs and they both fit in that year range.

Thanks for the help guys. I think I'll use the 50 weight in the duplex and 80 -90 or 85 -140 in the rear end. If anyone thinks this is the wrong way to go, please speak up. Thanks again

I know there have been other threads on this, but I'm still a little confused. What is the best oil to use in a TRD720 Duplex? I know back when it was new Mack recommended 90 weight Mineral oil. I have heard that 50 weight engine oil is what is recommended today. What is my best bet? Also what works best in a CRD78 dual reduction rear end? Thanks