I need help on the gear in my car 1st car 71 demon w/14x32 in the rear motor is 440-55 over 660 lift cam ez-1 heads 850 demon card 10in 4200 stall conv....the car currently has 5:13 in it but thinking about 4:56 what do you guys think.would work best not trying to spin past 7k just looking run run 10s.......Thanks for the replies

even with 456 you will be @7tho,
might think about 430 ,?
the cam will want @ 65-68 shift

other vote for 4.30

4.30s should put you solidly in the 10s and not buzz the motor as high.

You'll probably have to settle for street gears. No 4.30 Pro Gears have been available for a long time now.

what about 60ft times

That can vary all over the place... weight, traction,
rear suspension, how well its set up, front end set up...
along with gear and your launch rpm

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Mike motor is being assemble so i have not been to the track just trying get the right pieces line now instead of wishing i had done while putting everthing together

Thanks Mike my thinking was 456 gears would turn those 14x32 tires alittle quicker but not buzz the motor too bad btw i have acess to a 8in conv that around 5500rpm.........the rampage is looking good to

I have a 1971 Duster with a 518 low deck pump gas stroker with a 4.10 Dana 60, I run a 8 inch T/A race converter in it(not built for this motor or car ) and cross the finish line right at 6500 RPM using a set of 29x12x15 Goodyear slicks(91.5 inch circumferences at 15 lbs pressure) It has ran a best of 1.42 60 ft. times so far and 10.31 ET on the brakes, the best MPH off of the brakes was 129.+ MPH at WOT. I wouldn't hesitate to use a 4.56 in your car, I do use a low gear set, 2.77 to 1 ratio, in my 727 trans so it shifts into 2nd and 3rd gear sooner than it would with the 2.45 stock gear ratio My motor is 10.8 to 1 compresson wuth a custom grind Comp Cams solid roller cam that is 260 @.050 on the intake and 266@ .050 on the exhasut with right at .700 lift at the retainers on boh sides. The motor likes to rev past 7000 real easily, I try to shift it out of 1st gear by 7500 and out of 2nd by 7000 RPM but sometimes I miss the shifts points according to my playback tach and O2 system, it(O2 system) stores RPM as well as AFR for the entire run The motor has a set of M.W. size Indy SR heads with a set of T&D 1.65 ratio rockers and a Indy 400-2 intake with a Holley 850 D.P. carb.The car is heavy intentionally(3450 lbs wet w/ me in it) as I made it for a street car, not a "race" car IHTHs, don't forget about tire growth if your using a bais ply set of slicks. The little motors(stock stroke 440) need more gear multiplication on the starting line as well as the entire way down the track then their bigger stroker motor brothers do

I wouldn't hesitate to use a 4.56 in your car,

Thanks for the replies everyone the debate over at the shop was use the 5:13 that are in the car now but im lookin for a low maint motor to have fun with

A few years ago i swapped in a set of 5.13,s i had laying around from my normal 4.56,s. My car was similar to your combination,it ran the same with either. It,s been 5 or 6 years since i ran the quarter but at 10.21 at 129 mph trap rpm was around 6700 or 6800 at the finish line. This was with 4.56 gears 14x32 tire, i would go with the 5500 converter as my car picked up over a tenth when switching from a 5000 to 5500.Good luck and your car looks good.

I would run the 4.56... doing some calculations you
wouldnt even be at 7000...6400 + the conv, so if your
conv has 5% slippage thats basically 6750 rpm running
low 10s.... JMO but I like to see about 1500 rpm
between the conv flash and the gear change and set
the conv to flash at about max torque or a couple
hundred rpm above max torque

Thanks for the info everyone