Product Description Direct replacement for the stock shaft Meets or exceeds OEM standards Fits Late 1980 to early 84 big twins Replaces OEM 34039-80 Sifton Transmission Mainshaft at RevZilla Browse all RevZilla deals $118.99 In Stock at RevZilla Price checked 10 days ago Buy Now at RevZilla Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand Sifton Size OS Condition New MPN 17-0144 Sifton