1957 GMC Overheating. Please Help!!!!!

Ok guys. Here's the Update. After 2 late nights this weekend. I finally got everything pulled out & put back together. It ended up being a bigger job than I thought it would be since the motor & truck aren't original to each other. Anyways to make a long story short. After pulling everything off the motor I jammed high pressure nozzle against the water pump holes & flowed it until clean water came out both ways, I replaced the water pump, radiator, upper & lower radiator hoses, new coolant, & few other little things. Fired her up & got her to temp. Put it in drive & held my foot on the brake for 10 min to simulate sitting in traffic & then today I drove it for 15 min on the freeway & she never got over 185 the entire time. Also just to add some icing to the cake I dropped the drive shaft & replaced the rear transmission seal (was leaking), replaced the rear u joint, & changed the oil. I think the issue was the radiator. After I pulled it I realized how jacked up it was. Anyways, Now I get to enjoy her. Thanks for all the helps gents.




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