03' Big Red

I like the 58’s as they ride much nicer than a 44 plus I get into some severe off road situations and like the idea of having the heavy rears to keep parts from breaking

Ease of maintenance mostly

I inquired about them and was told even though they are stud pilot they require a special rim and can only run 24” tube tires

The 98 was a cracked valve cover, pin hole in oil pan and rear main seal that was installed improperly

The bearings are much larger and it takes a special hub not at all like 44-46000lb

Thanks for the update, it originally came with the 12r24 tube tires with 24” Dayton and was converted to 22” Dayton’s to run 11R24.5 i was thinking about changing it over to run hub/stud pilot but was told it required special rims and even then may be for the 12r24 tube tires.

I have a 1998 R model with the 58000 lb rears and would like to convert to hub pilot or stud pilot. I’ve been told they take special rims due to the larger hub/cone assembly can someone give me some information about this ? what would the correct rims be for this and could I run 24.5 tires ? I’ve hear it’s only for the 11r 24 set up

This would be a 2003 RD686S that has the AMI 370 program

I disagree on the Allison HD4560 being fragile the are much more forgiving than a manual trans and can handle the horsepower without a issue

Recently we installed injectors, rocker arms and shafts, camshaft,lifters and unit pumps trucks is 100% stock including exhaust manifold, turbo and injectors and it runs fabulous!! if you down shift at 1300 it’ll stay in the power band and up shifting at 1750-1800 keeps things moving smoothly. It will pull down to 1200 and keep on going we max out at 73280 lb here in PA for a Tri Axle dump

On the 2003 the cause of “oil leak” was actually a over zealous national oil change shop that pumped way to muc grease into the throw out bearing the 98 was leaking at air compressor, oil filter mount and looks like the rear main seal was damaged when it was installed

It is a automatic in the 98 Flywheel housings on both trucks went to machine shop to be squared up. not sure about cracks

I’ll look into that

I have two R models a 98 & 03 Both have oil leaks at the back of the engine AFTER the transmission has been out, rear structure resurfaced, new rear main seal and oil pans resealed. Any insight to what the problem may be?

That was Hempt Bros some sloped nose had the Cummins M11 there is a single axle dump set up like that in my area. I had a 88 Giant Tri axle dump with a L10 Cummins, 7LL trans and 6:17 axle ratio. Not much would stop it but it was a slow truck. sure wish I still had it.