not sure on your money situation... but a converter is a big kick in the pants but not cheap.. i went with a FTI 9.5" but it was $750.. as far as rebuild kit.. not sure i ordered a mix of parts from A&A and Cope, they do sell master kits though and for a 318 those should be fine, i went overkill as i worry bout breaking **** WAY too much although i never make enough power to break stuff :) The one part i would 100% replace no matter what is the rear servo spring cover.. i had one do this exact thing to me once, was able to fix it in car but it sucked. The stock one is just stamped steel and can bend under too much pressure.
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