trans problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

D13 · 10-20-2008, 06:08 AM

Its a 700 (2004r's never went into trucks).

Is it in 1st gear in drive or D1?

In LOW (D1) and reverse the line pressure is boosted and the L/R clutch applied. In drive or overdrive, 1st gear uses only the forward clutch. If the noise is not there in 1st gear in drive, there are a couple of possibities. Occasionally these trans will develop an oscillation in the pressure valve circuit, whwich will 'buzz' under higher pressures. The pump could be tired and complaining about having to make extra pressure for the L/R boost. A L/R seal could be leaking (although usually that would have other issues).

10-20-2008, 06:08 AM	#2
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,867	Re: trans problem Its a 700 (2004r's never went into trucks). Is it in 1st gear in drive or D1? In LOW (D1) and reverse the line pressure is boosted and the L/R clutch applied. In drive or overdrive, 1st gear uses only the forward clutch. If the noise is not there in 1st gear in drive, there are a couple of possibities. Occasionally these trans will develop an oscillation in the pressure valve circuit, whwich will 'buzz' under higher pressures. The pump could be tired and complaining about having to make extra pressure for the L/R boost. A L/R seal could be leaking (although usually that would have other issues). __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

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