Trouble With Tranny When Hot?

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Yes I would agree. I made the mistake of assuming that the basics had been covered. Spark plugs and wires can be very temperature sensitive. As for the 4T60 tranny. I unplugged several over the years for folks who could not afford to have the repairs. I never had any come back. But it is always best to repair it properly, but sometimes it is not an option. Glad to hear that yours was OK, plugs are much cheaper.