***Read entire description.

New Pioneer automatic transmission flexplate for 76-79 Pontiac 400 engines with TH400/TH350 transmissions . Flexplate has 2 1/2" crankshaft register. Fits the following:

76-79 Firebird/Trans Am w/ 400 Pontiac w/ 2.50" crankshaft register

TECHNICAL SPECS:

TEETH : 166
OUTSIDE DIAMETER : 14"
CONVERTER BOLT PATTERN : TH350 & TH400 (DUAL BOLT PATTERN)

NOTE : Pontiac engines had 2 different crankshaft registers, a 2.5" and a 2.75" register.  The register is what centers the flywheel on the crankshaft, but the bolt pattern for the flywheel is also different.  Typically, 75 and older is 2.75", 76 and newer is 2.50", but that is not always the case! YOU MUST MEASURE YOUR REGISTER PRIOR TO ORDERING TO ENSURE YOU ORDER THE PROPER FLYWHEEL!