For General Motors.
The 2007 Impala, Monte Carlo, Grand Prix and in 2008, the Buick LaCrosse, all receive the 4T65 transaxle when the 5.3L LS4 V8 engine is installed. Access to the oil pressure diagnostic port is restricted due to the high flow exhaust used for the V8. Previously essential adapters for the J-21867-A Oil Pressure Gauge will not fit the transaxle case pressure port due to their shape and thread size. J-21867-65 is a 135 degree fitting that will clear the exhaust pipe and thread into the port allowing pressure checks to be performed.Email
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