Fits all TH400 & '95-earlier 4L80-E

OE Part No. 24232745

OE cast aluminum servo pistons can be brittle and are prone to breaking. Sonnax heavy duty low/reverse servo piston 34914-01 for GM TH400 and '95-earlier 4L80-E transmissions is a direct replacement upgrade made from high-strength, billet aluminum to prevent failure.