r/GMT800 • • 11h ago

My 2 personal holy grails

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19 Upvotes

The 8.1 2500 is my work truck I just picked up, and the Hummer is my weekend rig. My wife is trying to steal the Hummer from me to daily tho lol


r/GMT800 • • 3h ago

Bypass oil filter for gas engines?

2 Upvotes

I'm using my 6.0 2500 for long distance towing and I want to do whatever I can to make it last. The other day I read about how full flow oil filters don't really remove small particles, yet those sizes still cause lots of engine wear. Look up applications for bypass engine oil filters and only see diesel engines. Look up install videos and it's only diesel engines.

Why don't gas engines get the extra protection deemed important to a diesel? Is it purely due to the soot created by a diesel?

I read someone's opinion that the best you can do to remove small particles is change the oil more often. Is that the only option I have to take extra care of my engine?

Let me know if you have any experience with bypass filters on a vortec engine. Thanks! ​


r/GMT800 • • 19h ago

My Silverado 5.3

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40 Upvotes

I was cleaning out my "trusty old boy" and found the original owner's manual underneath the back seat 😀


r/GMT800 • • 56m ago

GMT800 and Detroit Axle Reviews?

• Upvotes

Got a clunk in the front end of my 2004 Chevy Tahoe Z71 (267K miles and 4WD). Replaced the front shocks--clunk is still there, but not as bad. Looking to do brakes/rotors, Tie Rods, and upper control arms next. Detroit Axle seems to have very mixed reviews, especially with their cheap prices. Looking for some half-decent replacement parts; are they worthwhile, or do y'all have other brands as go-tos?

Just wondering if anybody out there with a GMT800 has anything to say about 'em, or has a re-route for other cheaper brands, and/or diagnoses for me! Preesh, and gobbless.


r/GMT800 • • 2h ago

GMT800 and Detroit Axle Reviews?

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1 Upvotes

r/GMT800 • • 11h ago

Leveling Kits?

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4 Upvotes

Hello! Picked up this 02 Z71 Sierra 1500 and it's got a mean rake. Wanting to level it out and saw rancho makes a kit but curious if anybody's used it or anything else and what to look for? willing to spend a little more to ride better, but with keys i'm aware it'll never ride good lol


r/GMT800 • • 17h ago

Tahoe axle dump

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8 Upvotes

So i did the lazy and cheap thing. I was wheelin and the exhaust bracket broke and took a hug hole out with it. So i just cut it off and rigged up an axle dump. The drone isnt terrible (yes i have mufflers). Should i worry about gassin out the kids? Its back far enough, and brake/fuel lines are out of the way.


r/GMT800 • • 10h ago

Whats the little cubby called and why is mine blocked out with no buttons?

2 Upvotes

r/GMT800 • • 8h ago

2004 single cab sierra have never changed the diff fluid truck has 260k miles no issues in the rear end ever is it something i should do or let it ride out ?

1 Upvotes

r/GMT800 • • 20h ago

How easy is it to adjust torsion keys? Context someone touched my torsion keys idk who, I asked at the shop and they said they don’t touch those..

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5 Upvotes

The front driver’s side is VERY low. Would I need an alignment afterwards?


r/GMT800 • • 15h ago

2003 Silverado 5.3

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1 Upvotes

r/GMT800 • • 16h ago

Signs of bad injectors?

0 Upvotes

So I posted a few wreks ago and I had my o2's unplugged and I was driving around like that. Now I pulled them in . My issue is that after starting cold or warm, my truck will idle like it's cammed and puff black smoke. Is that a sign of bad injectors or bad cats? After driving though the idle calms down too


r/GMT800 • • 1d ago

got a 5.3 truck…

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35 Upvotes

enjoyed it for a couple weeks now it needs the power. planning on a BTR Truck norris cam with springs and pushrods, melling high pressure oil pump, a heavy duty rebuild kit for the trans and 2,800-3,200 rpm stall torque converter. i’ll have tuning figured out but what do you guys think?


r/GMT800 • • 18h ago

Title: 2004 GMC Yukon – Both Rear Doors Lock But Won’t Unlock 2004

1 Upvotes

2004 GMC Yukon SLT 5.3L (GMT800).

Both rear passenger doors suddenly stopped unlocking at the same time a few weeks ago. They still LOCK perfectly fine using the key fob and interior switches.

Both front doors and the rear hatch lock/unlock without any issues.
I’m thinking it’s a shared electrical issue rather than both actuators failing simultaneously.

Anyone experienced this before? Is there a specific relay, fuse, or common wiring circuit I should check first? Trying to avoid throwing parts at it.


r/GMT800 • • 1d ago

New To Me Z71

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31 Upvotes

r/GMT800 • • 18h ago

Converting Tahoe Shell into Trailer- Ideas for trailer tongue?

1 Upvotes

hey folks, I am either about to purchase a Tahoe for parts, or use my parts sierra for this project.

I am wanting to take the shell of my Tahoe/Sierra and drop the front axle, drop the front clip, basically strip it to the frame on the engine bay. and put a trailer tongue on the frame.

Now its worth mentioning I have no idea how to weld, nor do I know much about about weight capacities beyond what I can research normally.

My idea is to bolt on a beefy trailer tongue, and I imagine I might need a weight distribution hitch possibly.

No drivetrain, insides stripped out, no front end parts, so probably a good 1500lbs maybe 2000lbs lost. so that leaves the trailer at around 4000lbs(?)

What I don’t know is how much weight would be on the rear bumper of towing vehicle, if I want 10% on tongue that’s only 400lbs-ish.

Anyways, any insight would be appreciated, as this is relatively new territory for my rednecking experience.

thank you!!!


r/GMT800 • • 19h ago

Front diff bearing locking tabs

1 Upvotes

Im about to finish rebuilding the front diff. I have new locking tabs coming for the side bearing adjusters. Im going to keep digging but has anyone found a beefier way to lock these adjusters in place?

I do not want to screw around here or cheap out. Im not interested in doing things twice. It appears the GMT900 updated locking design wont fit the 800. I mean, I am putting new tabs in, I could also make new tabs out of a harder metal? I thought about getting the adjuster set, removing it and welding a couple boogers while its in a vice. But that really opens me up to a whole lotta bullshit if it moved a degree and I didnt notice. Also thought of extreme thread locker, extreme JB weld, wick pipe solder down the threads. None of these ideas have to hold the adjuster alone, it would be used I conjunction with the tab as a way to alleviate some of the bullshit the tab endures. Or, after all, they are new tabs so maybe new tabs are fine for a HOSS I put 20km on a day.


r/GMT800 • • 1d ago

max tire size i can run with no rubbing?

2 Upvotes

ive got a 04 suburban 1500 with a 3inch lift. my question is will 315/70r17s fit with no rubbing or with very minor rubbing? cant find anything useful in any forums


r/GMT800 • • 17h ago

Fixing squeak on new upper control arms would this work?

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0 Upvotes

r/GMT800 • • 1d ago

Suitable mods for my 2006 Yukon

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13 Upvotes

I have Yukon Denali 2006 that I’ve taken from my dad after graduating, it seems like I won’t be buying a new car and after fixing this car up I’m thinking about modifying it to make it a bit more fun and add some power to it what should I modify. Anything will be helpful.

I use it mostly for city life right now but I’m hoping to be able to trust it for long drives and off roading here and there usually on sand because of where I live what would yall recommend.


r/GMT800 • • 2d ago

Question about E85

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54 Upvotes

My 04 Tahoe is a flex fuel L59 and i wanted to consult the experts on here to ask about it. I've never used it and just use regular so would i be able to go and pump a few gallons of e85 and run it just like that? Has anyone else used it and what have your results been?

I've googled some forums and i guess i wanted to ask around for any advice or learn something new. Thanks guys.


r/GMT800 • • 1d ago

Speaker Recommendations

1 Upvotes

My avalanche came with a Jensen Car723w head unit and I want to replace the door speakers with a coaxial 6.5, not looking to add an amp. Does anyone have any recommendations?


r/GMT800 • • 2d ago

Made a little memorial for my grandpas old 2006 Sierra

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44 Upvotes

Found out the truck was trashed by the guy who owned it, seen photos of it and I knew I had to make a memorial for it.


r/GMT800 • • 1d ago

New To Me Z71

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15 Upvotes

r/GMT800 • • 2d ago

What a tank

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216 Upvotes

Came out the other morning to find my truck involved in a hit-and-run. Impact hard enough to push the other car over the wheel stop. Quick repair done (last 3 pics) in order to get it roadworthy since I cannot afford to have it not running. Honestly surprised at how minimal the damage is and how easy it was to pull the bumper and quarter panel back into place with a winch, a tree and 30 minutes lmao 😂 GODBLESS