Truck starter and engine fitment?

I have a 99 Sierra 4.3 vortec vin w. I need a engine and found a 2004 silverado 4.3 votec vin x and the flex plate and torque converter are the exact same part number and item. But my Sierra has a 11 tooth starter and the Silverado takes a 9 tooth starter. Is it compatible? I work for O'Reilly and tried... show more I have a 99 Sierra 4.3 vortec vin w. I need a engine and found a 2004 silverado 4.3 votec vin x and the flex plate and torque converter are the exact same part number and item. But my Sierra has a 11 tooth starter and the Silverado takes a 9 tooth starter. Is it compatible? I work for O'Reilly and tried comparing the parts. A mechanic told me it should be okay but I'm confused. Both trucks searched by vins have a 168 tooth flex plate and 14.15 diameter. And the torque converters are the same too. And both have exact firing order
1 answer 1