[Excaliber]

WHOA!!!! If your rear end ratio is that low you will really be disappointed with the HIGH rpm you will be running on the street! Automatics have a high slip ratio in 1st and 2nd and if your not using a lock up torque converter the slip ratio still applies in third.

Slip ratio: Motor rpm turns the torque converter and the converter turns the trans gears. Figure 10 to 15% "slip". That is why auto trans cars ALWAYS come from the manufacturer with a higher rear end ratio than a stick shift.

Stick might be 3:50, auto will be more like 2:73, a BIG difference! You need to NAIL DOWN that rear ratio before you can begin to calculate stall speed! With a really low rear (3:50 to 3:70) I wouldn't go with a stall beyond STOCK! As far as that goes, I wouldn't use a rear ratio THAT low with an automatic unless I was strictly drag racing!

Am I a pain in the butt or what? Hey, just adding my 2 cents, lol.

Ernie