Originally Posted By: userfriendly
Thetruck454;
How is the 8L90E transmission holding up with all that power in a 3 ton vehicle? Is it a 4x4 with 3.23 gears or the max-trailer with 3.42?
The GL80 locker in the back might like 80W140 instead of the factory 75w90. Stock drive shaft?
Engine oil? Good question. No doubt you want a little added protection like the Corvette on track days. Is M-1 15w50 on your radar?
One down from that is 10W40 HM then 5w40 delvac CK-4. Personally I wouldn't go below 3.9 HTHS given the vehicle's weight 'n all.
My truck has the NHT(max trailering) package so I have 3.42's. I couldn't imagine having any taller gears than this like the 3.23's. If you get the 5.3 and the 8l90 and NHT you get 3.73's and I wish the 6.2 was the same.
So far the 8l90 is holding fine once I had the dextron fluid flushed and replaced with mobile 1 synthetic per GM's tsb. The aftermarket hasn't caught up with it yet so I didn't have much choice when I came to building it up. Circle D makes a nice tripple disc converter, but EFI Live nor HP Tuners have enough control of the tcm to tune for them properly, so I chose to wait on those.
Stock drive shaft now, but I have a local shop making me a new one as we speak. They are doing calculations to see if they can stay with a big one piece aluminum or have to go to a 2 piece steel.
I have a Detroit truetrac in my garage to replace the G80 with, I just have never done rear end work so I'm trying to find someone to help me with that install. Oddly enough the recommendation for the truetrac is regular dino gear oil without friction additive. Using either synthetic or friction additive reduced the bias ratio of the diff and can cause one tire fire senarios.
Originally Posted By: FlyNavyP3
I've probably built or dyno tested over 200 engines at double or triple this power level on a Xw30 oil. No reason to be worried about a 30 oil in this application. Plenty of supercharged camaro engines living long lives on 5w30 making 600 whp.
I would probably run a Mobil 1 0w40 year round though.
To the OP your engine is different in many ways from the Corvette engine but no worries. The stock 6.2 internals are really really tough.
Running any good 5w30 or 0/5w40 will be sufficient year round. My pick for ease of locating and purchase would be M1 0w40 used with a Fram Ultra filter.
From my understanding in the past the LS2/LS3 in the vettes was different than the L92 in the trucks/suvs, but for the new genV engines, the LT1 and L86 are the same aside from injectors, intake manifold/TB and exhaust manifold. When my truck was ordered, it was held up for 4 months because vettes and escalades had priority for 6.2 allocation ahead of the trucks.
Originally Posted By: Jeepplr
Take 2 for this reply:
I have a 2002 Chevy LQ 4 ProCharger supercharged, water methanol injected big tune big injectors making a little north of 500 hp.
First: Remove your PCV set up you are likely pressurizing your crank case.
I bought my truck new in 2002 drove it for 500 miles remove the OEM oil and replaced it with Mobil1 10/30.
At 90,000 miles I added the supercharger the truck now has 215,000 miles on it.
I send each oil change sample to Blackstone Labs were nothing of great interest has shown up other than I have the engine that is notorious for piston slap so I have high iron and high aluminum.
At each spark plug change we borescope the engine and now even at 215,000 miles the crosshatches on the cylinder walls are still visible. Thanks to the water injection there is very little carbon buildup on the pistons.
My truck drugs a 12,000 pound horse trailer from Ohio to Colorado most years in the summer and I have far more horsepower than I do cooling capacity. It has never gotten hot enough to set off any alarms but I always watch it closely at all times.
My supercharged LS engine truck that pulls a ridiculous amount of weight or runs in subzero weather at 215,000 miles is still going strong. It has had a steady diet its entire life of nothing but Mobil 1 10-30 or 10-30 high mileage.
I don't think you will go wrong with any high performance oil that you select for your truck but from my experience Mobil 1 will give you exceptional performance and long life.
If you have question just ask.
It has been frustrating to do this response over multiple times sorry for it being a little short on some details.
Thanks for the dedication to the reply.
My old truck was a lq4 with a cam, long tubes, and a radix mp112. I was lucky enough not to have the piston slap, but I only kept it till 80k miles. That motor was a beast. It hit much harder down low than the current truck, but this 6.2 pulls much harder up top.
The positive displacement blowers don't pressurize the pcv systems like the centrifugal ones because they draw pre compressor, but I do have a catch can to catch most of the junk that goes through it, and I'm installing meth to help clean up the rest(not that it adds more power or anything haha). I'm also doing Blackstone lab oil analysis too, so I "should" be able to track any changes/issues.
So it looks like for ease of purchasing I may go with mobil 1 0w-40. I use the wrench on k&n oil filters, those are supposed to be good correct? Forgive my ignorance but what does the abbreviations like HTHS, PAO, HM, etc mean?
