Opinions on 4 speed with OD

Well, it's well known that the Factory OD unit, with the large retainer and aluminum case, Cannot take abuse at all from some horses. That said I've had a few of them in trucks behind slant sixes and they're a damn good unit for just cruising around in a truck. I had a step side, I'd rev that slant up, side step the clutch, She'd just boil the back tires. I don't know if Brewer did anything to address that or not...