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    Help diagnosing engine noise

    Video of engine bay Details: Stock QJ, stock intake, stock cam, headers, no EVAP equipment (factory), 18-18.5 inches of mercury vacuum at idle I can’t figure out if the droning/burbling/hissing noise I’m hearing is normal or not. I thought it was a vacuum leak but all the lines in the bay have...
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    Gas spilling when filling up

    When I fill up my stock 25 gallon tank at the pump, the pump stops/clicks as normal when full and shortly thereafter I can hear gas spilling. Looking underneath, I can't quite pin point where the spill comes from other than the general tank area. Other than that, vehicle works great -- fuel...
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    Missing air vent component?

    I have a 76 GMC Burb and am troubleshooting why I don't get a lot of air flow when I put my HVAC controls on Vent or AC. Blower motor was replaced last year and it works across all speeds. Last year I did have the passenger side kick panel replaced with one that allowed for a speaker. I took...
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    Motortown Impact Package for Suburbans?

    I found this brochure for a Motortown Impact Appearance Package that GMC seems to have made available to dealers/buyers back in 1976. http://www.73-87chevytrucks.com/pdfs/1976/1976 Motortown Impact '76 Suburban.pdf Has anyone actually seen a Suburban with this package out in the wild? I'd...
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    Passenger turn & side marker lights trouble

    On my 76 Burb, I can't seem to track down what's causing my passenger side turn and side marker lights to not work correctly. Here's how they are functioning right now: * Turn on hazards = all lights work but passenger turn + side marker lights which don't turn on * Engage right turn on...
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    Gear oil thrown around rear diff

    I have a 76 GMC Burb C25 2WD w/a 454 engine and the TH400 behind it. I believe it has a full floating rear axle and 3.73 gears based on the RPO codes. I had a shop completely service the rear axle earlier this year (new seals, brakes, bearings, service diff, etc). A few weeks ago, I noticed a...
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    Cruise control inop

    I noticed that my factory cruise control was not working on my 76 3/4 ton Suburban. I took a look at the 76 Supplemental shop manual to learn up on the Cruise system and seems like the major components are: the regulator, the servo unit, brake switch, and the column switch. The brake and...
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    AC noise under throttle

    Truck: 76 GMC C25 Suburban w/454 + 3 speed auto + factory air conditioning When I'm driving and have the air conditioning on (Max or Normal mode, at any Fan speed) I hear what sounds like a short sucking sound every 40 seconds or so. It gets louder as the RPMs go up and I don't believe I hear...
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    Interior door handle pocket trim

    I recently purchased a 1976 GMC C25 Suburban in the Sierra Classic trim and while most of the truck is in good shape, there's a few things in the interior that can be improved. One of the things that's bugging me is that a couple of the door handle pockets are in bad shape. The rear driver side...
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    76 GMC C25 Suburban 3-point seat belt trim question

    I recently bought a 76 GMC C25 Sierra Classic Suburban and looking to improve the interior a bit as the outside is well taken care of. Seats belts is where I'm starting since it only came with lap belts all around. I bought a set of 3-point seat belts from LMC Truck. It seems pretty...

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