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I am running a recently rebuilt 350 TBI, bone stock other than the 30 thousanths overbore and the general basic rebuild items. I think the heat issue contributed to the transmission issues.
Some more progress, I changed the fluid in the differentials. The rear fluid was nasty, looked like mud and was very thick. Don’t know what was up with that. Front wasn’t bad. Temporarily filled them both up with motor oil, drove around for five minutes or so, and then drained that off. Still got a little more of the muddy mess out of the back but it was much cleaner. Filled them both up with Amsoil gear oils, used severe gear in the rear and ATF in the front. The fill port on the front differential wouldn’t come off, had to pump the oil into that one using a hand pump through the drain plug, and quickly cap it off.
Had two fill ups recently, first 15.5 MPG and second 14.5 MPG. First tank had a lot of idling, checking the truck didn’t overheat after the fluid change. The second had about three hours of off-roading on it, so that explains the lower figure.
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