Hey guys,
I am 22 and I just found a great deal on a 2008 LMM from a Chevy Dealer around here. It was a demo truck they tell me, and it only has 857 miles on it as of now. Anyway, I had kept my eye out for a low mileage pre 2006-2007 because of all the EPA stuff on the trucks. But this seems to good to pass up.

I plan on these things if I get the truck:

- DPF Delete
- Programmer (not sure which one - please help ===> everyday driving, very very little towing heavy things, may tow a few ATV's, may sound stupid but I want some smoke)
- MBRP 4" or 5" Exhaust (please help decide)
- Some kind of intake (please help decide - want the best one)
- Tranny Kit (not too familiar with this but I am told that WOT runs on this truck will cause premature tranny fail, someone point me in the right direction with this)

Thats all I can think of for now.

I really want a truck that will not suffer from all the emission stuff on it. That is why I want to let the truck breathe by removing the DPF but I am not sure if I should do more than that. My idea is to make it similar and run similar to a Duramax without a DPF - if that is possible.

Also, I want to remove the DPF but I hear that it will throw some codes and I read that a specific programmer will get rid of the codes but which one is it? How hard is it to install/take off the DPF for emissions and stuff?

Please help me guys.

Thanks,
-Mike

 

Someone ought to chime in

 

Also, keep in mind ALL of these mods void your warranty

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oh and welcome to the site. ^^^^^^ that wasn't supposed to sound douchy I just got done surfing and I'm still in pirate 4x4 mode.

https://www.dieselbombers.com/lmm-bo...parisions.html
there's the link to that writeup and the other thing is you NEEEEEEEEEEEEEEEEEEEEED gauges!

 

Welcome to DieselBombers!

Just like what has been said already.. there are several options for the Duramax's. PPE is a great all around tuner, and I believe will block the codes from deleting your DPF..

Just about ANY vendor we have can help you out with prices for these things.

Many times you can get a 4" exhaust (DPF Delete) with a programmer as a package deal.

If you dont plan on making 550+ RWHP, then you dont need to buy an aftermarket intake.. its completely unnecessary.. You can simply modify your stock intake box and use the stock filter.

If you are DEAD set on an intake I recommend the S&B intakes.. they are GREAT pieces.


As for your Alli, If you dont flog it, and you change the fluid and filters regularly, mine has held up 435 rwhp for a couple of years now with only a Transgo Jr Shift kit. they are quite cheap. But regular maintence, defuled shifts, and not driving like your 16 will go along way.

 

Yeah, make sure you know what you're getting into first. If you're okay with that, go for it.
Not sure how much abuse a demo truck is subjected to in 857miles, but it might be worth holding out a bit until you know the truck is sound mechanically before you modify it a lot.

There's a few threads on here about tuners for the Duramaxes. EFI Live, PPE are really good ones.

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https://www.dieselbombers.com/lmm-bo...parisions.html

 

I guess I should have rephrased that better.

By demo truck I mean a truck in which the dealer was allowed to drive. I dont know how they were able to do this but here it goes.

I know the owner, pretty well in fact - it was his truck for just over 800miles. Hes ~65 years old and I know for a fact it was just a truck to go to and from the dealers he owned, I have ridden in it many times with him. I have no suspicion that this truck was beaten on for those 857 miles. The other 57 miles was from moving around the lot, running down the highway to the other dealers he owned and just general use. No salesmen drove it - just him.

As for the warranty, my brother has been working at a Chevy dealer for more years than I can count and he knows his way in and out of the LMM (so he says). He said he will do any work for me. Thats when it pays off to have a pain in the *** while growing up.

So the PPE sounds good, thats what he reccomended too but honestly, which one should I get. Theres +2 and +1 and HOT - I have no clue what those abreviations mean at all. Someone please explain.

I just really want to have about 400-450rwhp, how much rwtq should I expect if I have that much rwhp?

I will most likely get a shift kit - just for the sake of mind.

This will be driven almost everyday, fairly hard but nothing like a 16 year old. Im talking full throttle for a little bit and hard accelerations.

I want to be able to cruise at 80mph and not be close to 2700rpm like I am in my brothers LLY (I think). This may sound like a stupid questions but what is the RPM's while in top gear at 80mph on the 2500HD? What is the gear ratio stock and if there is an aftermarket one? Which one will suit me best?

Sorry for all the questions guys, I really am new to the diesel trucks in terms of owning them.

 

A modded airbox, 4" exhaust and PPE standard will give you around 430/830 at the tires..

 

In the new 6 speed allisons, @ 80 MPH I think you're going to be running 2255rpm, 1895rpm @ 70mph on stock tires. But I'm not 100% sure, I just did a quick caclulation. GM uses 3.73 axle ratios in all their duramaxes regardless of year or model, but the new ones (06+) have the double overdrive tranny.

In my 5spd allison, @80mph I'm at 2500rpm, @ 70 I'm at 2100. With the 6spd it shouldn't be as much of a concern.

@ 450RWHP, make sure you get a good transmission upgrade.

I'm not sure what power levels the PPE has.
Pacific Performance Engineering - Diesel Specialists
Maybe someone else can give you some better info.

Dude, sounds like you're getting the deal of the century- your own personal mechanic, a broken in engine by a family friend, can't go wrong there. Post pics of that badboy once you get it.

 

thanks man.
im really thinking about pullin' the trigger on it.

what shift kits do you guys reccomend?

 

i think most people that don't get a built trans go with the transgo jr kit and a suncoast tc.