Info on cat d5b 98j02106

If you have all that information you need to study it closer. Transmission speeds and gear teeth as well as capacities and general dimensions are covered in the parts book. Also need to look into the Lubrication and maintenance guide form #GEG00665 in the back of the service manual.
About the only thing you won't readily find is the dimensions of the V-belts.

My apologies and yes gear speeds are in the spare parts manual and I am sure now that the other info will be there too. For the record the fan belts are B70 which I with a bit of trial and error. If I could seek your indulgence with a question - when guys say final drives are a weak point what do they mean in terms of what actually goes wrong eg bearings and seals or more catastrophic failure like shattered gears or broken shafts.
Ian

Weak final drives usually refers to your later catastrophic failure.

If it's in reference to the D5 remember it is really an earlier D6. They are not particularly weak until you go trying to make it perform as a late D6 or D7 with compound final drives.