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At some point the chain in the transfer case will need replacing. Rebuilding the transfer case isn’t hard or expensive. How many miles on the 2500?

100% That 2500 hd with the 454 & 4l80e is gonna put you WAY AHEAD in towing. It will drink more gas. But it will survive towing, and do it far more safely. I say get it, drive and wait to see what breaks down before starting to dump money into it. There are things that will make it better...

If the price feels bad- just look up what a quality set costs for a duramax. One injector alone is more than the whole set from Leroy.

Do a search for fireproof black foam. Make sure you pick one that withstands direct contact heat of 300°. It won’t catch fire but can melt if not rated for the high heat it will come in contact with.

I don’t want to make it sound like it can’t do it. But understand you are taking a rig that when brand new, you would be maxing it out. That would shorten the life of any rig. Now you are trying to do it on one with 30 years and all we can guess is a quarter million miles on it…

Well, sending a set of old injectors that are most likely worn out means they need s full rebuild, not just pressure adjustment. So they will need new pintles bought for them then the adjustment. So it is almost same cost as just buying new ones then having them adjusted. You probably stand...

The 1500 w/ 5.7 - check your door sticker because you are pushing the max capacity with it. Capacity changes with transmission and even gear ratio and depending what you have you might max it there If you are going to tow that much just a couple times a year and not through mountains on the...

Are you adding a car lift at some point?

Welcome. No, lack of a proper lift pump will ruin the ds4 or db2 much sooner. Some permanent changes are suggested to solve the issue now & for future. You have a ds4 ip (injection pump). Out the front of the ip is a 1/4” fuel line in an upside down U shape. Replace it with clear line. You...

Wish I knew something about the ally trans to help. All I know is they take a beating and live forever. Might need to find a specialized forum since they don’t fail all that often.

The reason Marty is asking is if there is air in the line before you start, the “burp” of air will cause a hard start and often smoke when it does because the first batch of fuel isn’t burning properly. Then maybe no air intrusion while running…

100%!! Keep the other engine, they used to be cheap, now they are getting harder to find at a good price. Set up your camera to watch the clear line for the next couple of cold starts. Then if that turns up nothing, I would begin with doing the water down intake trick to clean out all the...

Did that just start happening?

White smoke is unburned fuel, water from humidity, or coolant. As good as it isn’t for your lungs, smelling the smoke tells you what it is.

@MrMarty51 measures at the ip inlet is what counts. 8-14 is ideal range. But if out of range, I would rather 1psi high than 1psi low.

Maybe his truck is just under pressure to perform?

As to problems from the system- the same design actually came from the racing industry, known as gear drive. The idea that vibrations go through the gears into the injection pump and cause issues is as ignorant as can be. Ignorant as in someone is uneducated. The db2 pump used in gm before...

I see ya made it here. Hopefully someone has a spare they are willing to part with. For those unaware, Leroy has ran out of current stock and any next availability from him is undetermined.

Just post a pic of your old one

Gm is always using undersized wires- penny pinch on copper costs. Multiple places the wiring should be increased.