1999 Detroit 60 series 500hp @2100 rpms

I don't know. I usually redlined those engines coming down if she wont settle down halfway in a given gear on a downgrade. Aint hurt it none.

I try not to abuse the lugging on it. But she'll do it for you when asked nicely. I usually pick a gear where Mr Pyro is happy. Not overload it going up. That means reduction. If you aint got enough transmission to find a good reduction then I don't know what to say. That means 13's 15's and 18's

Its a older engine now and I like them. Actually used to them. Its the Cats that get me going. But eh...

 

The rebuild kits come with new ones. Chances are yours has them, if not, can be added,

 

Why wait? Next time you drain the oil drop the pan and put them in. If your careful to not cut or tear it, you can reuse the pan gasket.

 

My truck has an info plaque on the dash. Among other things it says "minimum rpm hard pull 1,400 rpm. I keep to that for the most part. I will loaf around if I'm empty, but loaded, in the hi range, it doesn't see 1,350.

 

That's cool, I didn't know that such a plaque existed. A wise man once told me the same as your plaque. Don't pull a 60 series hard under 1400..

As mentioned I only have a 1800 engine. Didn't mention it's a 9speed. I usually take er all the way out to 1800 while upshifting loaded because the next higher gear drops me down to ~1300. Sucks in the hills trying to gain speed. End up crawling to the top sometimes for fear of lugging damage..

Yep, while empty I'll let her down to ~1200 flat ground sometimes. Only has 26,600lbs to keep moving though..

 

A 9 converts to a 13 real easy and cheap.

 

Does it have to be a specific convertible version, or are all 9's convertible..?

Mines a rtx 12609b

 

To my knowledge all 9s convert to a 13.

 

actually decreased egts lugging it increases egt. The few months i ran an 01 500 it loved 1700-1900. Anything below 1600-1625 she would drop off pretty quick.

the one i was in had 3.42 /24.5lp 13sp. Hardly ever got in the last aplit unless i was empty. 7.5mpg+ all day long