Allison 5sp: 05 lly 135k

[mechman3]

Ok so what can be done with a stock trans with 135K on it without a complete rebuild? I am getting new head gaskets, installing a lift pump, egr blocker and prolly putting a 4" exhaust with muffler on a stock truck with 135k on it. I will be driving daily and towing my boat (6k lbs) and bed will have 3K lbs camper in it on occasions. I am not looking to go above 500hp in the foreseeable future.
Any and all suggestions are welcome. I would like Mike L's 2 cents though.

 

[Mike L.]

You must build it. The '05 will limp if you look at it cross eyed.

 

[cstephens93]

Surprisingly, I had a 200hp+ tune on my truck for two or three months before I had mine built. Never limped. But once you do build it, you immediately feel a sense of relief driving around lol

aka build it completely

 

[mechman3]

Thanks guys that is what I was thinking. I was hoping not but had a suspicion

 

[THEFERMANATOR]

Nothing you can do with the stock 5 speeds C2 design without going into it. It's unavoidable with the 5 speeds. Build it, get a good converter, and you will feel a WORLD of difference.