Back on the road. Lease purchase with JB Hunt

Removing the speeed limiter has no effect on anything else.

 

Doesn't it have an air restriction on the filter housing?

 

Looks like this.....



It should be on the air piping between air filter and engine....

 

Sorry. Left the word gauge out of the post. Obviously my brain is to old and slow for multi tasking.

 

Where are you at 3,000 feet?

Define performs worse please.

I'm looking at a 680, that probably has the same power train, it's a 500 horse, but it's a 13 speed.

I just know if yours was plumbed as a 13, it would do much better. That 3.21 ratio needs that extra gearing.

 

If that is accurate then there is something very wrong with that truck. There isn't a single pull with a legal weight load on any interstate in the lower 48 that should require dropping to 5th.