J&L TH350 Air Test Block

Professional TH350 air test block. This J&L air test tool aluminum construction and allows you to verify clutch pack apply before final assembly. Air testing is the single most important quality check during any transmission rebuild, confirming that all seals are properly installed and all clutch circuits are holding pressure.

Prevents costly comebacks by catching assembly errors before the transmission leaves the bench. Essential for any professional rebuild shop. Precision-machined ports align with transmission case passages for accurate testing of each individual clutch circuit.