dont waste ya $$ on a spool just weld it, mines welded rear and ARB front and i have had no probs except that i chew out the 5.29's (only coz they r toyota gears, a mate of mine has an after market set of 5.)29's with a welded rear, 35 MTR's and has hah absolutly no probs
Maybe check your hemisphere hypo , It could be out of shape after the application of the HEAT ,
Oh and replace the yoghurt with some oil now and then