Gear ratio for oil field work pulling tanker?

With that weight, and depending how much highway you travel, you would do better with at least 3.55 or 3.90

 

Does 18 spd stand for 18 speed? If not, what does 18 spd stand for?

What does 6 nz stand for?

What does 3.25 rears mean?

 

Why is 3.55 or 3.90 better than 3.25 at that weight? I've been a company driver my entire career. I don't know what gear ratio means.

 

What size tires?

With 11r 24.5s I would prefer 3.90s or 4.10s with that weight in the hills.

18 speed.

6NZ is the serial # prefix for a Cat C15.

3.25:1 is the rear end ratio.

 

How did you people learn about rear end ratio in the first place? I don't think that most truck driving schools teach about rear end ratio.

 

Just by reading this forum. Now you know also

 

So is it the case that the higher the load that you are carrying, the higher the gear ratio that you need?

 

With a Cat and at those weights and running some hills. I’d want at least 3.70. That’s assuming you’re running 24.5’s off-road in the oil field. When I ran in the Northwest with a Cat we had tall 24’s and 3.70 rears, but our max gross was 105k.

 

Those 10 year old Halliburton t800's had 4.36 gears I think,with 10 speed.Get up to 60 mph pretty quick,but limited to 62 or 63 mph.