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Just wanted to reach out and see if anyone is interested in trying AMSOIL's ATL in their 8sp transmissions that are having the shudder issues. If you are, PM me your address and I can get you a discounted quote delivered to your door for 16qts. That's basically the amount needed to do a fluid exchange. Thank you.
Hey guys, new to this forum. Recently purchased one of the dream trucks of mine, 2014 Sierra Z71 4x4 5.3l. Which I was finally able to afford lol, bought from a local dealer with 88k miles.
Prior to purchasing I test drove it, checked the history and maintenance records from GMC. All seemed well, purchased it and few days later while driving home on the highway cruising about 60-70mph, I began noticing a really loud sudden vibration that would come and go every few minutes (feels like it’s coming from underneath the truck not sure), lasting about 5 seconds. Even around 20-30mph I notice some shaking. Seems to be shifting fine, drives pretty smooth other than these vibrations that are coming and going. I just don’t know what it could be. I didn’t notice it during the test drive, just my luck, hoping for the best. Any opinions are greatly appreciated, I attached a video as well of the sound.
A few months ago I installed a set of Texas Speed and Performance long tube headers and the catted y pipe they offer. Some then
ive noticed the front of the transmission pan leaks a little bit. The bolt heads have trans fluid on them all the time and every now and then it drips onto the exhaust and I can smell it. I believe this is due to the heat from the catalytic converter that is positioned directly below the trans pan. I haven’t noticed any higher trans temperature and the fluid level of the trans hasn’t gotten low so it not a bad leak, just an annoying smell mostly. I’m trying to decide what to do and I thought I’d get y’alls opinion. I was thinking about making a heat shield to go between the cat and the trans pan. or maybe just tightening the bolts on the trans pan, if I remember correctly the torque spec on those is pretty low and the added heat from the cat might be enough to make it leak. Thanks for any input.
Hope nobody minds, but I'm going to start up a Quick Reference Guide for common parts/fluids/bulbs for the T1 HD trucks. I'll try to keep it updated if anything changes. If a mod wants to sticky it, I'm down for that too.
Chevrolet: https://my.chevrolet.com/content/dam/gmownercenter/gmna/dynamic/manuals/2020/chevrolet/silverado-2500-3500/2020-chevrolet-silverado-owners-manual.pdf GMC: https://my.gmc.com/content/dam/gmownercenter/gmna/dynamic/manuals/2020/gmc/sierra-2500-3500/2020-gmc-sierra-owners-manual.pdf Diesel Supplement: https://my.chevrolet.com/content/dam/gmownercenter/gmna/dynamic/manuals/2020/chevrolet/multimodel/2020-6.6-duramax-diesel-supplement.pdf Oil Changes
6.6 gas L8T (VIN code "7")
Capacity: 8 Quarts AC Delco Oil Filter: PF63E / 19383806 Drain Plug Size: 12X1.75X18.15 6.6 Diesel L5P (VIN code "Y")
Capacity: 10 Quarts AC Delco Oil Filter: PF26 / 89017527 Drain Plug Size: 12X1.75X18.15 Engine Air Filters
6.6 Gas: A3244C / 84121219 6.6 Diesel: A3248C / 84554703 Engine Fuel Filter
6.6 Diesel L5P: TP1015 / 23304096 Interior Filters
Passenger Compartment Air Filter: CF185 / 13508023 Wiper Blades
Drivers & Passenger Sides: 23387857 Spark Plugs
6.6 Gas L8T: 41-114 / 12622441 Glow Plugs
6.6 Diesel L5P: 68G / 12690238 Fuel Tank Sizes
6.6 Gas L8T, All Box/Cab Configurations: 36 Gallons 6.6 Diesel L5P Double Cab Long Box/Crew Cab Standard and Long Box Configurations: 36 Gallons. 6.6 Diesel L5P Double Cab Standard Box Configuration: 29 Gallons. 6.6 Diesel L5P Regular Cab Long Box Configuration: 28 Gallons. Diesel Exhaust Fluid
Tank Capacity: 7 gallons Automatic Transmission Fluid
6L90 6 Speed MYD (Gas engine): DEXRON-VI Automatic Transmission Fluid 10L1000 10 Speed MGM/MGU (Diesel engine): DEXRON ULV Automatic Transmission Fluid. Transmission Capacities (Approximate):
6L90 6 Speed MYD (Gas engine)
Pan Drop: 6.0 quarts Overhaul: 10.5 quarts Complete System: 12.4 quarts 10L1000 10 Speed MGM/MGU (Diesel engine)
Overhual: 20.6 quarts Complete System: 22.08 quarts Transfer Case Fluid
Electronic Shift Non-Autotrac MP 1625/1626–NQF: Dexron VI Electronic Shift Autotrac MP 3025–NQH: Dexron VI
Transfer Case Fluid Capacities
Electronic Shift Non-Autotrac MP 1625/1626–NQF: 2.4 Quarts Electronic Shift Autotrac MP 3025–NQH: 1.6 Quarts Brake System
Hydraulic Brake System (Vehicles with DOT 3 brake fluid): DOT 3 Hydraulic Brake Fluid Hydraulic Brake System (Vehicles with DOT 4 brake fluid): DOT 4 Hydraulic Brake Fluid
Wheel Lug Nut Torque
All Models: 140 lb-ft / 190 N-m Front Axle 9.25"
Axle Lubricant: 75w85 Synthetic High Efficiency Lubricant, 10-4091 / 19300457 Capacity: 1.9 Quarts Rear Axle 11.5"
Axle Lubricant:75w90 Synthetic Lubricant, 10-4016 / 88900401 Capacity: 3.17 Quarts Rear Axle 12.0"
Axle Lubricant:75w90 Synthetic Lubricant, 10-4016 / 88900401 Capacity: 3.17 Quarts
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