Transmission Oil Cooler Adapter FittingsSpecifications Size: AN6AN8 Details hese fittings measure 0. 520" across the 1 4 NPS threads. Please measure your factory ones to be sure these will fit. In 1997 GM moved one of the cooler lines to the back of the transmission. The front adapter is short and the rear is the longer one with the tube. This is very crucial to the cooling circuit of the transmission.
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