Drag Racing

[BadBird]

Moved my Falcon out to the new garage. Have the new 9" housing, axles and bearings on order. Can't afford to get the third member yet. Too close to Christmas to spend that much. When I get the new housing I will pull the old one. Install the new, install the driveshaft loop that I have, and install the line lock system.
The third member is a Strange rear end with 4:11 gears, traction lock and 31 splines.
Then will need some steel wheels and slicks. I think I will stick with 14 wheels but still not positive about that yet.
I intend to take a whole lot of pictures of the rear end swap, loop install and line lock. May use them for upcoming newsletters. That is if I can figure out how to do a newsletter. It is hard being an old fart.
Also, now I can get my truck back in the house garage and not freeze my bottom off everyday. Larry

[BadBird]

After reading the post about brake fluids I realized we have some folks on here that can figure this out for me. Can some one tell me what the tachometer readings would be at 70 mph in my falcon with my Tremec T5Z transmission that has a ratio of .68 in fifth gear with 4:11 rear end gears and 4:56 gears?

[dhbfaster]

No problem Larry...but I also need to know your tire size.

But if my calculations are correct, with 295/50R 15 tires at 70 mph, a 4.11 rear end, a .68 transmission gear ratio at 69.72 mph, your tach is at 2456 rpm.

Hummm...now where do those 4:56 gears fit in...sorry I didn't include that in the estimation.
Ok, I'm not really that smart, but I'm a gooder googler. Check out this calculator: http://vexer.com/automotive-tools/speed-rpm-calculator

[BadBird]

I am definitely not smart. I couldn't figure out how to work the charts. Anyway, I perused a whole lot of different forums about the wisest rear gears and there are bunches of answers.
I found one with a guy who has a 64 Falcon with stroked 302 T5 tranny and 4:11 gears. He turns 2300 RPM at 70 which is fine with me. He had 15 inch tires, 28" tall so my 14's would turn a little higher than that. I am pretty much settled on 4:11 by now.
I was looking at a mustang forum and just about puked. Guy wants different gears but was worried that the extra RPM's might make it hard to hear on his cell phone?????? What the heck???? Probably wouldn't want low gears and spill his coffee???
Times have definitely changed, and what the heck, I am 68 years old and still want to get the front wheels off the road.
Maybe buy a , oh well, never mind. I am getting politically incorrect again. Larry

[dhbfaster]

Hey...what that guy said is pretty close to what the calculator said!
That calculator was pretty quirky, but give me your total tire size numbers and I'll put it in and we should have the correct calculation.

[BadBird]

My tires are P235 60R 14.

[BadBird]

According to this site, my RPM would be 2481 @ 70MPH
with 265 60R 14 tires and .68 transmission ratio with the 4.11 gears.
That works well for me.

Larry



http://www.csgnetwork.com/multirpmcalc.html

[ew1usnr]

I was looking at a mustang forum and just about puked. Guy wants different gears but was worried that the extra RPM's might make it hard to hear on his cell phone?????? What the heck???? Probably wouldn't want low gears and spill his coffee??? Times have definitely changed, and what the heck, I am 68 years old and still want to get the front wheels off the road.

This is funny as heck.

[dhbfaster]

Tire growth!! I never thought about that!
Just like the dragsters.