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@ idM1028: I have an automotive stethoscope. It was on sale at Harbor Freight Tools for like $1.98 or something.

Barrman: Well, my shifting was never broken. It still shifts the same as it always has... just makes this hissing sound right before a shift (about 50% of the time). It could be that I have just not located the source of the problem. About this resonator / baffle on the air filter inlet...

I'll have to check through the lines one more time... I did not look at the hard lines or the ones down at the trans itself (if there are any... I feel like I saw one down there, but I haven't looked lately and can't remember) Can one of those other vacuum components (pump, modulator, etc)...

Replaced the vacuum lines for the transmission. They were old as **** and basically cracked off in my hands. Glad that's taken care of. The sound, however is still there. It's very weird... happens only at like 80% of engine's redline. Maybe I'm just finding the harmonic frequency of some...

The sound happens related to engine speed, not vehicle speed... so it happens at lower speeds as well... like I said it seems to be when the trans is getting ready to shift (1st to 2nd, 2nd to 3rd, and also in third at higher engine speeds) I assume my trans is still the stock TH400. It's...

Does the vacuum system really produce so much vacuum that a leak could make a hissing sound would be audible inside the truck while it's driving ?? (truck is very noisy)

Yes, my first course of action is replacing the vacuum lines.

Hi all, It's gotten pretty cold out, and I've started to hear a funny noise... A hissing sound, like compressed air escaping. Seems to be coming from the front of the vehicle. It seems to happen when the engine is at higher revs, actually it seems like it happens mostly at times when the...