Mcculloch, Weedeater, Husqvarna Genuine Transaxle Assembly 532 43 61-44, 5324281-06, 532 43 72-81, 532436144

For those that don't know due to the pack of photos, this part number is essentially the entire drivetrain page of the manual already assembled ready to bolt into the frame. New diff, chains, friction disc, the lot - even outside chassis and spindles the rear drive wheels go onto!

If you're throwing the main drive chain like I was, this will guaranteed solve your problems. I tried to cheap out replacing individual parts but it very quickly became uneconomical compared to buying this all in one item.