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You can run a big cam up to 2700rpms before it puts a valve in a piston. Max hp is 2100 2150rpms. I run mine up to 2300 or 2400 on a heavy load shift to get me out of the hole around 1700 on a wide gapped transmission. This is especially something to do on an Allison 4000 series in a 915/916 as...

On a 9 10 or 13 you are going to have to start off in 2nd or 3rd anyway. Otherwise you will be grinding without enough speed up. The CAT I could start off as high as 8th. But the cat is a whole different beast Most 9, 10s 13s can swap on an SAE 2 housing to match the small cam or 6cTa...

Weak link is the Input bearing. But it takes severe torque. This was big cam with 1500ft lbs thru a CAT 7155 with a 2.66 low range transfer case. It used to eat 1710 u joints in low range. But I wore an input bearing out a few times. Without being a heavy modified 5 ton it'll hold up for awhile