Quik

with a 5 speed car 355s are better unless you use it just for racing and then go with the 373s.

jhogan2424

ohssquik02... I do NOT have the correct speedo or tire diamater on my car. BUT, I did use my GPS to show me how fast Iwas going. The GPS shows 70mph @ 2650 rpm's. This is the same GPS that Itrust to show meexactly where the runway is when I am comingin on a night flight. And the GPS is more accurate than any speedometer on any car ever built. </P><edited><editID>jhogan2424</editID><editDate>37943.5812384259</editDate></edited>

Quik

well if you do have the smaller tires on your car that is the reason your spinning alot faster. your speed can be right. like if i put my et streets on my truck my speedo would be way off. i might even gain some from it but i would end up topping out before the end of the 1/4 mile. correct tire size is the key when doing speedo gear swaps with gears.

BLOWN91VERT

Since my 91 has 4.10's I have to stick up for them here. With the AOD 4th gear the highway stuff is really no big deal. Yeah if you cruise at 80/90mph you will be buzzing the motor a bit. But I drive mainly around town, stoplight to stoplight. Most street races end by 50/60mph(unless you want to lose your license). For that the 4.10's are king. More gear reduction, more acceleration. The only problem I have with 4.10 is having enough gear in the quarter when you're pulling 115mph+. 6250 comes up fast in 3rd gear with 4.10.

Quik

you can hit 115 in third. damm i was only able to muster 102 out of it running 245/50/16s maybe now that i have my 26x10.5 etstreets maybe a little more speed since the tires are alittle taller.

95cobragirl

go with the 4.10's tiger...i have those in my cobra...they're great...they kick *** from light to light...gotta regulate those little kids ya know...especially in them rice burners...but im still able to drive it around town everyday...so if you want the umph but still drivable...4.10's, jenna

BLOWN91VERT

QUOTE]you can hit 115 in third. damm i was only able to muster 102 out of it running 245/50/16s maybe now that i have my 26x10.5 etstreets maybe a little more speed since the tires are alittle taller.[/QUOTE]

I've installed 28X10.5 M/T Sportsman Pro tires to bring the RPM's down. Ideally you want your trap RPM a few hundred RPM beyond your HP peak. That will maximize your ET. With 245/50/16's on my car I was spinning the motor well past where I was making peak power. As your HP rises you either need a higher peak RPM or lower numeric gears. Every tenth helps.