The 1947 - Present Chevrolet & GMC Truck Message Board Network - is it my transmission or diff whining??

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1964FarmFreshC10

09-30-2025 02:45 PM

is it my transmission or diff whining??

My 64 C10 has a 230 I6 with a 3 on the tree.

When driving at speed there is a loud whining noise in the cab that goes away when you let off the accelerator. Right away based on that I would assume its rear end noise but its so loud in the cab it almost has me thinking its possibly the transmission.

Is there any trick to telling which?

forestb

09-30-2025 03:45 PM

Re: is it my transmission or diff whining??

What happens if you bring it to the same rpm in neutral?

franken

09-30-2025 05:34 PM

Re: is it my transmission or diff whining??

What happens if you put gear oil in the diff and trans?

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