A bellhousing that bolts to the pump face is only as square as that pump lets it be, and any runout there shows up as clutch and pilot wear. This direct fit bellhousing skips the pump entirely and bolts straight to the transmission case, so alignment depends on the case machining instead of a stack of parts.

ATI Performance Products 200044A SFI Direct Fit Bellhousing Features:

• Fits GM TH350 and TH400 transmissions with a modified OEM case
• SFI 30.1 approved
• Cast from 356 T-6 aluminum
• Bolts directly to the transmission case rather than the pump face
• Case must be precision machined to index off the outside diameter of the pump
• Sold individually