The motor (441577-0113 E1 051011yh) in my JD 100 series motor went locked up and was wondering if I could get either the 44n677-0037 (1"×3-5/32") or the 40n87728-1956 motor to work as a replacement
I had the exact problen with a D170 a short while ago. I matched my blown engine with https://www.brandnewengines.com/
I bought their 1 x 3-5/32 #49S877-0019 and fit perfectly. Contact them, and they will assure you match your engine.
Short answer
Yes
Any B & S ride on motor will drop in
The only real difference will be the alternator wires but you can swap any of them over ( with the appropriate regulator ) so worst case is you will have to swap yours over to the new motor
