Just picked up my 93 GMC after a transmission rebuild. Transmission works fine but I immediately noticed a weird rattle (as did my wife). Took it to the rebuilder and he says it’s not in the transmission. I tend to agree, it’s correlated to engine rpm’s and disappears when I let off the throttle. Not that noticeable at idle. Immediately noticeable upon acceleration in gear. Only oddity with the engine while rebuilder had it was that I forgot to tell him about the manual glow plug switch so he started it without glow plugs. It’s bad enough that I’m not comfortable driving it. Anyone have any good hypotheses on weird rattles?
93 GMC 2500 pickup
4WD Xtra cab.
New Optimizer 10/14
Rebuilt Central Plains Diesel IP 10/14