rpm w 456 & 4r70w

[indyrt]

has anybody run this combo and what crusing rpm do you get..? It's been too many years for me to do the math...

Thanks

 

[dave89iroc]

what size tires?

around 2700 rpm with 26" tall tires at 65 mph

 

[Detroit Gearbox]

tire height times 3.14 divided by 12 = x
5280 divided x = y
y times gear ratio = rpm 2 60 mph times .7 (4r70w ratio) = rpm @ 60mph

Gear Ratios (AODE):
2.40:1 1st gear
1.47:1 2nd gear
1.00:1 3rd gear
0.67:1 4th gear
2.00:1 reverse

Gear Ratios (4R70W):
2.84:1 1st gear
1.55:1 2nd gear
1.00:1 3rd gear
0.70:1 4th gear
2.32:1 reverse

 

[indyrt]

28"....sorry

 

[dave89iroc]

28"....sorry

should be about 2500 rpm at 65 mph then

 

[soap]

tire height times 3.14 divided by 12 = x
5280 divided x = y
y times gear ratio = rpm 2 60 mph times .7 (4r70w ratio) = rpm @ 60mph

Gear Ratios (AODE):
2.40:1 1st gear
1.47:1 2nd gear
1.00:1 3rd gear
0.67:1 4th gear
2.00:1 reverse

Gear Ratios (4R70W):
2.84:1 1st gear
1.55:1 2nd gear
1.00:1 3rd gear
0.70:1 4th gear
2.32:1 reverse

:cheers:

--Joe