j hancock

Depending on exactly which 13 Fuller is being used, the 3.98 ratio will be better for you. 

Let's say your Fuller has the 13.13 1st gear ratio, as many do, combined with the 3.98 rear end will give an overall ratio of 52.25. 

A Mack X107 6 speed (lo hole) has a first gear ratio of 14.10 combined with a 4.17 rear (pretty common ratio) gives ratio of 58.97 and they play pretty well off road.  Camelback suspension helps also in the dirt.

Better buy now, it is a collector item!

12 hours ago, Jamaican Bulldog said:

How does a RD frame depth and thickness compared to a DM?

DM 400-600 frames are a little different because they have a belly. 13.37" depth in the belly and 10.75" when it straightens out through the tandem section of the frame.  .375" frame material thickness.  Insert frames were available as in double frame.  The insert did not have a belly. 

DM800 are straight with a 10.62" depth and multiple inserts were available as well as outside frame plating to specifications.  .312" frame material thickness.

I'll second that.  Time to find a doctor.  Hope things aren't too bad.

The R is a 9" frame depth with .250 material thickness and the RD is a 10.62" with .312 material thickness.

OEM engine oil would have been straight 20, 30, 40 weight non-detergent depending on the ambient temperature.  Some trucks didn't even have filters on them so oil was changed every 1000-1500 miles.  Oils certainly are better than they once were!

Trans and gear would be 140 straight mineral oil.  Don't need EP.

Depending on brand aux. trans. not sure what you would need.

Any chassis grease will work for the fittings.

I try to use the OEM lubricants.  Some folks have said they use multi viscosity detergent oil in their engines so the debate can start.  Do you want the dirt to stay in suspension or drop to the pan?  is there no filter or a bypass filter?  For me and a very low miles hobby truck, change the oil once a year and you are good.

You can check here.

https://www.bigrigchromeshop.com/mack-logger-with-inch-break-back-bumper-p-41007.html#.XwudQShKiM8

18 minutes ago, tjc transport said:

it does not say banned, but i see where Barry banned her on August 21, 2017

Thank you TJC.

It is very interesting that the public profiles were just recently cleaned up.

11 minutes ago, david wild said:

I kinda like it when they are on here, same reason I watch fake news, nice to know what the enemy is thinking and god are they stupid

Concise debate can be productive but if every argument starts on one subject and then diverges to run the gamut from Abortion to Xenophobia, it misses the mark. 

A sniper doesn't use birdshot.

18 minutes ago, tjc transport said:

so gearhead can not post in any threads.

teamstergrrrl status?

Nice pic 58!

1 hour ago, tjc transport said:

where did you find this info? i just did a search and gearhead is still banned from posting, 

A review about 2 weeks ago of the public profile for GG and TG indicated "Banned".  Both accounts have since been changed.

Always good to have some protection...

Jack the frame so the springs hang.  Nothing trick about the grease.  #2 EP grease. 

Check for the letter/numbers per diagram for engine block identification. 

If you can get the full Mack 313GC number off the pump tag, might be able to do some figuring that way as well.

More diagrams in link to ponder.

https://www.bigmacktrucks.com/tutorials/article/70-wiring-schematic-for-series-parallel-switch/

Nice B!

10,300 lbs with bed.

Yup, that's ugly.

Yup, lots of tread!

CF's come up for sale so you can get your own!

A FAW616D front axle is rated at 18,000.

RD685S6855 left the factory as 1 front steer axle and 2 drive axle tandem. 

Early VINs (such as this) or the modern 17 digit VIN will not give as built axle ratings.  Have to run the number with a Mack dealer or the Mack Museum or find the axle numbers currently on the truck.  Couldn't answer why it has hydraulic brakes on the front axle.  Either special order or changed in the field?

The RD model was introduced by Mack in 1970.