The Gear Box Transmissions
MUNCIE - T56 - TR6060 - T5 - SUPER T10 - 3550 - TKO - 3650 - TOP LOADER
3550 TKO 500 600 > 3550 TKO 500/600 Mainshaft 31 spline FORD
3550 TKO 500/600 Mainshaft 31 spline FORD
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Price: $304.11
Availability: This product is back-ordered; it is unavailable for ordering at this time please come back or continue shopping.
Prod. Code: TCFP4310

 Mainshaft for a Tremec 3550, TKO , 500-600 transmission. with the  31 spline output. Ford applications. Does not fit the GM application.

This is for the ..68 overdrive 

Genuine OEM Tremec part # TCFP4310.