HELP gear selection

[1967coronet440]

f'n a! nice choice!

This is the only pic for now lol, I'll send you a picture of the invoice if you donate money to it

 

[MarPar]

This is the only pic for now lol, I'll send you a picture of the invoice if you donate money to it

View attachment 401059

 

[wsutard]

Interesting. All the calculators, including the one linked, say I should be at 2550 RPM at 60mpg. Supposedly I have a 3.55 rear and 28" tires. (275/60 R15).

REAL WORLD: 3000 at 60mph. The calculators say that is 4.17. WTF.

 

[1967coronet440]

Interesting. All the calculators, including the one linked, say I should be at 2550 RPM at 60mpg. Supposedly I have a 3.55 rear and 28" tires. (275/60 R15).

REAL WORLD: 3000 at 60mph. The calculators say that is 4.17. WTF.

This one says you should be at 2700 rpm at 65mph, gotta figure these "calculators" are ball park at best

http://www.crawlpedia.com/rpm_gear_calculator.htm

 

[Yatzee]

Hey guys, trying to decide on a gear for my new dana, street strip application, 600hp, 3000 stall 29"tire torn between 3.73 or 4.10 can someone throw out some pros and cons of each for me. Will 4.10 be too much to take on the highway occasionally, I'd like to be able to drive it to shows that may involve 60+ mph

Who gives a $hit with 600hp. You can damn near turn any wheel with confidence and few will be in your league. On the other hand 4.10's will cost you a pile in fuel when your just cruising but they'll love you at the strip and neck braces are still relatively cheap. I drive a 512 stroker, 630hp, 3800 lb car with a 3200 stall and I can barely keep the 25 1/2 tall tires connected with 323 gears. Their 10 inches wide.

 

[Mike67]

Interesting. All the calculators, including the one linked, say I should be at 2550 RPM at 60mpg. Supposedly I have a 3.55 rear and 28" tires. (275/60 R15).

REAL WORLD: 3000 at 60mph. The calculators say that is 4.17. WTF.

I've never really thought about it regarding these online calculators but it might have something to do with the variances and not being able to compensate for the variables (TC stall)
Is your TC loose? 4000+?

 

[wsutard]

Is your TC loose? 4000+?

4 Speed.

 

[66Satellite47]

Interesting. All the calculators, including the one linked, say I should be at 2550 RPM at 60mpg. Supposedly I have a 3.55 rear and 28" tires. (275/60 R15).

REAL WORLD: 3000 at 60mph. The calculators say that is 4.17. WTF.

Jack the car up, rotate the tire exactly one revolution, count the number of turns the pinion or driveshaft turns. You can see the difference between 3.5 turns & more than 4. Then it's not "supposedly". Just a thought.

 

[not so famous bob]

Jack the car up, rotate the tire exactly one revolution, count the number of turns the pinion or driveshaft turns. You can see the difference between 3.5 turns & more than 4. Then it's not "supposedly". Just a thought.

approx. 650 - 700 / h.p. 727, 3:73 , 29.5 tall draq radials , loose 3500 convertor , about 3000 around 70-72 , speed ometer jumps around so bad it`s hard to tell. guessing car weight around 3050. the last calculator listed is pretty close.