Gear ratio

[Pete F]

What rear end gear ratio are you guys running for red light bandits with built engines?
Thanks


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[rotorwrench]

Back in the day, the 4.11:1 ratio was favored with a set of Lincoln Zephyr gears. Put some safety guards on for the rear hubs when the axles break. A quick change rear end set up might be a good choice.


Most folks favor more highway friendly set ups now days since most of us already killed our fair share of equipment back when we were young.

 

[JSeery]

I like 4:11 gears (and I run a QC). Other factors come into play as well, what transmission are you running? What diameter and type of tires? Is it a stock rear axle/ closed driveshaft?

 

[Pete F]

I have 4:11 in the rear now with Strange axles and a power trax posi unit
I think I may go a little lower maybe 4:30 or 4:40
Than when I flip the gears I’ll have like 3:80’s for highway

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[JSeery]

Sounds like you have it figured out! With a lower max rpm engine it will really wind up quickly, requiring a shift!!! If your avatar is the car in question, I would also consider larger diameter rear tires (but then that will raise the effective ratio, not lower it).

 

[Pete F]

Sounds like you have it figured out! With a lower max rpm engine it will really wind up quickly, requiring a shift!!! If your avatar is the car in question, I would also consider larger diameter rear tires (but then that will raise the effective ratio, not lower it).

It had pretty tall tires that’s why I think I can get away with the lower gears



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[JSeery]

Best bet if you can get the change gears is trial and error. That's how it was done on the tracks in the past. That sure looks like what I would consider an East Coast rod from the 50s/60s.

Love the left rear quarter fuel fill setup!

 

[Pete F]

Thanks I was shooting for a 40’s - 50’s
East coast rod

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