Just wanted to post on here, as I have seen no less than a thousand posts with questions about the 6L80E, specifically about the power threshold of a stock unit. I have a 2014 GMC Sierra SLT Crew Cab Standard Bed stock 3.42 gears stock drive shaft stock 20" rims/tires 6.2L fully forged top/bottom end "Armageddon Twin Nagasaki's" (GT3582R's) e-boost 2 gauge Z06/LT4 fuel system 365lph in-tank Armageddon fuel pump QTP exhaust cut-outs and laid down 965rwhp/850 rwtq on a mustang dyno with 18psi on 116 race fuel (cut-outs open). I say all of this because the stock transmission detonated the 4-5-6 shaft (intermediate hub) near the splines. I took it to a "race shop" that said they would upgrade as much as they could; and was told at the time, there were limited aftermarket parts available for the 6L80E. This was mid 2018 with less than 10K miles on the truck and about 500 miles on the engine/turbo build and I discovered that was not entirely true. I drove the truck after their work, with "spirited road driving" while the roads were wet no less. Long story short; they f'd me and I detonated the 4-5-6 stock intermediate shaft again within 100 miles and no traction at all. They apparently replaced all parts that were broken with stock parts! Moving on, I took my truck to a different shop and researched my a** off and found PATC Transmissions. I had a warm and fuzzy after speaking with them and ordered the Phoenix Level 4 Master Rebuild kit among a few other minor accoutrements and re-tuning of my TCM by Mike from Century Automotive. It is now APR 2019 and I am about 1 1/2 weeks away from having the my billet planetary gear mailed to me; for the new, more reputable shop in my area to install all of this PATC bada**ery. If anyone is truly interested, I will post new info once I put the new Phoenix Master Rebuild kit through the ringer with the full weight/horsepower/torque of my particular application...I hope this helps if there are some lost souls out there that may be headed down the same long. hard. road. of a "full send" like myself! Please post if you have questions/comments/concerns; as I have "been there done that and forgot the t-shirt" with the L86/6L80E so far.
Sold my 2015 Silverado a few weeks ago and bought a new GMC Sierra SLT with the z71 package and the 6.2L v8!
Had the camper shell moved over and sold the Silverado to my dad.
It's been a great change so far. Nicer interior so my wife and daughter enjoy it. It's much quieter with the active noise cancellation, and the thing just SCOOTS!
My 5.3 that i had before was modded and would move pretty quick but this 6.2 just puts it TO SHAME.
Installed an AFE Momentum GT Intake on it a few days ago and it's even better.
Just cracked 1000 miles over the weekend and it's already better on gas mileage, ride quality and everything in between than the silverado was.
Very excited for the modifications to come.
Looking to add some fox coilovers to all 4 corners in the next week or so, which will level it out and lift the front end.
Will then upgrade to 10 ply tires, probably a good bit taller than stock. (thinking about cooper at3 XLT's currently in probably 275/65R20 or 285/60R20)
Then planning to put airbags on the back for towing.
Still undecided on exhaust setup, but will plan to do that and probably tune it in the future as well.
Anyways, heres a pic of the truck when i picked it up. i'll post some pics of the intake after installation as well.
First post but following for a while now, I was wondering if anyone on her has done, or has seen a set of aftermarket Silverado headlights in a Sierra? I have a 2012 Sierra and I like the look of some of the Silverado headlights a lot better than the ones I have now, just want to change it up a bit and was wondering if anyone new if they we able to just be bolted in normally or if there was a conversion to make it possible?
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