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11-30-2015, 12:51 AM
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#1 |
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Registered User
 
Join Date: Sep 2015
Location: Norman OK.
Posts: 54
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Loud bang during hard acceleration
79 C10, truck runs great but have had a weird noise lately.
Twice the last few days if I hammer it at about 30 miles an hour there is a loud bang/slam, it feels and sounds exactly like someone pulled up the tailgate handle and let the gate just fall open. It's definitely a WTF moment. Any ideas? |
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11-30-2015, 01:03 AM
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#2 |
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Registered User
Join Date: Oct 2009
Location: Buhl, Idaho
Posts: 1,438
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Re: Loud bang during hard acceleration
Does it make a bang/clunking sound when going from P to R or R to D? If so your u joints might need to be replaced.
__________________
86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903 
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11-30-2015, 01:08 AM
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#3 |
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Registered User
Join Date: Sep 2015
Location: Norman OK.
Posts: 54
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Re: Loud bang during hard acceleration
No sound when putting in gear.
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11-30-2015, 08:00 AM
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#4 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,521
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Re: Loud bang during hard acceleration
My old tailgate had that feature. More than one tailgater took evasive action when it would decide now was a good time to drop open.
Very loose spare tire? Check all your cab bolts and mounts. Bed bolts. Might only have two or three left due to rust. Loose exhaust? Less likely could be a lean mix backfire. |
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11-30-2015, 09:12 AM
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#5 | |
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Registered User
Join Date: Sep 2015
Location: Norman OK.
Posts: 54
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Re: Loud bang during hard acceleration
Quote:
New exhaust is solid. |
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11-30-2015, 11:38 AM
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#6 | |
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Registered User
Join Date: Feb 2015
Location: Bonham, Texas
Posts: 241
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Re: Loud bang during hard acceleration
Quote:
Maybe they 007'd your Truck and put a gun in the back. |
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11-30-2015, 11:44 AM
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#7 |
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Registered User
Join Date: Nov 2013
Location: sumter sc
Posts: 79
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Re: Loud bang during hard acceleration
Leaf Springs?
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11-30-2015, 12:08 PM
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#8 |
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Registered User
Join Date: Sep 2015
Location: Norman OK.
Posts: 54
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Re: Loud bang during hard acceleration
Ha ha, wish it was 007'd.
I lowered the truck, all leafs and u bolts are tight. Its just like the tailgate dropped open, really hard bang. |
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11-30-2015, 12:59 PM
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#9 |
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Registered User
Join Date: Oct 2009
Location: Buhl, Idaho
Posts: 1,438
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Re: Loud bang during hard acceleration
How is the condition of the transmission mount?
__________________
86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903
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11-30-2015, 02:24 PM
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#10 |
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Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,472
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Re: Loud bang during hard acceleration
Check to see how much the engine lifts up on the drivers side when you rev it.
Had something similar happen on a 55 Chevy sedan that had been converted to side motor mounts. I never did determine where the "bang" was coming from. But replacing the old rubber mounts with polyurethane mounts fixed the problem, and reduced the engine movement substantially.
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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