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    2018 Tahoe-EXPERIENCE changing axle ratio?

    My research is turning up a lot opinions on 3.08 vs 3.42, and that has been helpful, but I can’t seem to find a lot of folks who have actually had the change done. I have the 3.08 and per the manual my towing capacity goes from 6400 to 8400 if I had the 3.42. I have the 5.3 engine and...
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    My 2018 tahoe front strut numbers - what gives...

    First post in the 2015+ forum - been in the 1991-1999 group for a while. Happy to have made the upgrade to the 20th century. Purchased 2018 4WD Tahoe LT two months ago, 38K miles, was a fleet car. Front is bouncy. I'm looking for OEM part numbers on the struts and no amount of searching will...
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    When do we worry about brake fluid leaks - now or soon?

    A few drops of bright green fluid on the garage floor, passenger side, under the step rail. Took a peek and appears to be brake fluid. A little bit collected around a joint in the line. Not gushing, but obviously there's a leak. Just the one part of the one line, checked all others and did...
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    Tech2 readings on engine data 1

    Ok, so I invested in a tech2 scanner, and thanks to this forum I have the service manual for the 1998 (mine is a 1999 yukon with 5.7). Took a look at my Engine Data 1 and compared this to what the Specs section shows as the "typical values." I tested under the recommended conditions: i.e...
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    Bucking

    I have a situation that is hard to replicate for a mechanic without a long steep hill and smooth pavement, nearby their garage. I'm hopeful someone recognizes what I'm about to describe here… 1999 Yukon. Stock everything except fuel injectors (Delphi FJ10566) and exhaust (Flowmaster...
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    Aftermarket exhaust responsible for low RPM bucking?

    Has anyone replaced their stock exhaust with aftermarket and then a few months later started experiencing a "bucking" at low RPMs in overdrive? I've eliminated nearly every other culprit I can think of. No codes...I've done the torque converter test where I tap brakes with throttle open, but...
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    Delco distributor cap?

    Hey all. For the last tune up on my '99, I ordered a Delco distributor cap with part number D329A. Doesn't look like it comes up when browsing our vehicle on rockauto now, though the Delco rotor can be found there. Funnier, amazon knows my vehicle and says the D329A doesn't fit it. Confused...
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    Random small dip in revs at idle

    Hello all. 99 Yukon with 124k miles, engine and transmission are almost new - they were replaced (with stock) at around 116k or so when I threw a rod. Handful of other non-regular maintenance replacements over the last 10-15k miles, kind of as opportunities presented themselves (for instance...
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    A/C compressor is cycling even though A/C is off

    99 Yukon SLT. Noticed today that my A/C compressor is cycling, even though the A/C is off. Roughly every 18 seconds it goes on for roughly 6-7 seconds. Probably wouldn’t have noticed if it hadn’t been for that noise (that I can’t think of how to describe) that you hear at the front...
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    Stock exhaust replacement

    Original exhaust system giving me the putt-putt sound, believe it's time to go. Looks like GM still makes the cats but not the tailpipe and muffler - unless anyone's had any luck sourcing that assembly? New, that is....
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    Security light

    '99 Yukon SLT. 120k miles. No major electrical upgrades or changes, no aftermarket alarm or remote start or anything like that, and no electrical issues outside of the usual OBS small stuff up to this point either - except now I've got my security light popping up on the dash. Every time I...
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    Threw a rod - parts options?

    Hey guys. Threw a rod over the weekend. Awesome. The only person I know that I can trust with my vehicle is one of the master techs at a local Chevy dealer - though that peace of mind comes at a cost. I've been able to mitigate some of the cost of his device over the years by sourcing the...
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    Door locks - fob fine, but switches no good

    Hey y'all. 99 Yukon SLT. Power door locks function perfectly via key fob, but not by way of any of the finger switches in the truck - driver door, passenger door, inside of D pillar. Neither lock nor unlock work. Don't know when they stopped working. Fuses in dash and under hood all good...
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    Rough 1-2 shift when accelerating hard

    Hey y’all. 99 Yukon, 4WD, 5.7L, transmission code M30. Butter-smooth shifts up and down all gears under all conditions except 1-to-2 when “accelerating in spirited fashion,” is otherwise perfectly fine when driving grandfatherly (good luck doing so in Chicago area without getting shot). What...
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    Confirming intake gasket and spider part #s

    Hey y’all - Intake manifold leak on my 99 Yukon 5.7L. Doing fuel injector spider replacement while I’m at it. I’ve looked at everything I can find on the forum concerning replacement parts and it would appear the general consensus is to upgrade to MPFI - just want to confirm the Delphi FJ10566...
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    A/C compressor replacement

    Hey y'all. So, I’m told (by a few service people now) that my A/C compressor needs to be replaced. Telltale green dye all over the compressor. Might be working ok right now and/or for a short period of time but will most likely stop producing cold air right when I need it most (which is to...
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    Name that drip

    Hey y’all - '99 Yukon, 5.7L Vortec, 113k miles. Drip under the engine bay, slightly oily to the touch, faint green in color. Where I see the drip hanging is where the front driveshaft meets the diff, and on the part just underneath it. Not saying that's where the source of the drip is, just...
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    Brake hard, stop..let off brakes...CLUNK.

    Hello gentlemen - long time lurker, first time poster. Great forum! A riddle for the gurus out there…..99 Yukon SLT 4WD, 113K, overall great runner and well cared for. Cruising along at let’s say 30-ish, decent around-town speed. Hit the brakes hard - doesn’t have to be an emergency stop...

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