Profmopar
New Member
Regarding you original query re spool vs LSD, I agree with the team, go the LSD (Suregrip). The locker (which a spool is) will have no great advantages anywhere except the dragstrip or for stunt driving in a movie.
However, better than both would have to be an Eaton Truetrac centre (available for many rears, I'm not sure about yours). It is tough, reliable, always spins two wheels when the pedal's down, doesn't lock...ever, and won't wear out like your suregrip.
I don't know the full story re your engine/trans/chassis combo, but 3.55s would be great around town, 3.9s even better, 4.10s dynamite within city limits. A holley 650 double pumper will work better than a 750 unless you run low gears, and a loose convertor (>2800rpm stall). Any back-to-back study on the 650 vs the 750 in the real world of the street will convince you......try it, if you can borrow a 650 DP. Dyno shootouts between the two will not see the salient differences......years, and I'm mean YEARS of experience are my source. On a 440, the 750 comes into its own, but we are talking 57ci more, or 15% more displacement. Notably, a 750 flows almost exactly 15% more than a 650 at the same pressure drop.
However, better than both would have to be an Eaton Truetrac centre (available for many rears, I'm not sure about yours). It is tough, reliable, always spins two wheels when the pedal's down, doesn't lock...ever, and won't wear out like your suregrip.
I don't know the full story re your engine/trans/chassis combo, but 3.55s would be great around town, 3.9s even better, 4.10s dynamite within city limits. A holley 650 double pumper will work better than a 750 unless you run low gears, and a loose convertor (>2800rpm stall). Any back-to-back study on the 650 vs the 750 in the real world of the street will convince you......try it, if you can borrow a 650 DP. Dyno shootouts between the two will not see the salient differences......years, and I'm mean YEARS of experience are my source. On a 440, the 750 comes into its own, but we are talking 57ci more, or 15% more displacement. Notably, a 750 flows almost exactly 15% more than a 650 at the same pressure drop.
