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727 rmvb 4200 9.5" 275/60/15 MT Drag Radial....Mostly Street driven but gonna hit the track too.. I foot brake the car already been 1.52 60 with 4.30 (Richmond) gears and still tuning..Should go 1.4's with no problem.. I have a set of 3.91 dated 1970 and wondering how strong they are

Thanks but did they answer the question of is a factory ring and pinion strong enough to handle 600+ hp/tq?

Anybody know how strong a factory installed 3.91 Gear set from a 489 case 8.75" Mopar rear can be? How much hp/tq can they handle with 35 spline axles/spool @3600lbs? Making over 600 hp/tq.... Are they a strong steel or weak? Should I just buy after market gears? I already broke the stock...