Nice Find
I have been fortunate in recently buying a '67 GMC SWB 1/2-ton pickup. It was an eastern Oregon farm truck, and it has only 80,000 miles on it. It's so basic that it doesn't even have a cigarette lighter! It's got a 250-cid six-cylinder with three on the tree. On the build sheet (found between the seat springs and the seat padding), it says the truck was assembled in California. How many '67 SWB trucks were built? I cannot get an answer from GM. Thanks.
via e-mail

Wow, you really found a low-mileage truck! Information on the GMC line of 1/2-ton trucks is hard to come by. Total production for the Chevy C10 shortbed Fleetside was less than 44,000 units, and since we rarely see GMCs on the road, it's a good guess that the GMC production total was far less.

Just Whistle
My '00 Chevy Silverado pickup has started making an odd whistling noise at low speeds. The truck has the 5.3L V-8 and an automatic transmission. I only notice the noise when the stereo is off. It's most noticeable between about 1,000 and 2,000 rpm. I've opened the hood while my wife ran the engine at different rpms. As near as I can tell, the whistling is coming from the top of the engine in the area of the throttle body. Does this mean that something is failing with the throttle body? What else could be causing the problem? Is it something to worry about or is it just annoying?

My truck is out of warranty, so I would appreciate any help you can give me. Thanks.
John Densham
via e-mail

Other owners of '99-'02 Chevrolet and GMC C/K-series trucks, Suburbans, and assorted SUVs have complained about similar noises. This is for trucks with the 4.8L, 5.3L, or 6.0L engines and VINs V, T, Z, N, and U. The engine RPO codes are LR4, L59, LQ9, and LQ4.

The whistling is caused by airflow through the intake manifold. The cure is to replace the intake manifold with part number 88894339. This would be easy if your truck was still under warranty. Replacing an intake manifold isn't difficult but it is time-consuming, so you could run up a substantial shop bill. As long as driveability is satisfactory, we suggest keeping the stereo cranked up.

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