Re: my jeep is screaming but why
Had the same problem with my AMC 401. Thanks to the guys on this bulletin board I got it all figured out. The oil pump gears wear out with time. This affects the "left" bank first. A cheap replacement is available from a few places. It is a complete rebuild kit, gears, spring and relief valve. The only thing missing is the gasket but any autozone or checker has these. I will try to find the email address of the guy I bought my kit from. It was $20 including shipping. I'll keep you posted. The procedure is real simple. Even if this does not solve the problem (it usually does) it is a cheap way to have a new oil pump! A temporary fix is running 20w-50.
If it can't be done from the seat of a Jeep, it don't need to get done!