My radiator horror story...
RE: 01 Sub K2500 8.1L 4L80E
My radiator has the built in oil cooler with 5/8" conns and 3/8 trans cooler conns.
At EVERY turn, my OEM traces to ACDelco #21435 (even at the dealer)
Problem is... #21435 comes with the wrong size oil cooler conns.
NOBODY has the right number. I'm currently waiting for the shop to pop the intake tank and swap oil coolers.
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