Tintoy35
Well-Known Member
Thinking of putting a lower 1st gear in my 727 while freshening up. The car has cal trac and I thought someone said their car didn't like the lower 1st gear with cal trac. Any thoughts appreciated.
Opinion wanted on low gear for 727
- Thread starter Tintoy35
- Start date
R413
Well-Known Member
Cal tracs are Racing parts. Like stock eliminator racing. These guys are serious. They are running high 9’s with 9” wide tires and big blocks with plenty of gear ratio. I bet they have low gear sets as well.
Call cal tracs directly they are very helpful.
Depends on The track prep where you race and the starting line condition.
Call cal tracs directly they are very helpful.
Depends on The track prep where you race and the starting line condition.
fbs63
Well-Known Member
Low first gearsets are for heavy, underpowered cars. Small block or 383. Otherwise leave the 2.45 in it.
Traction is a function of way more than just suspension type. Shocks, tires, power level, overall gear ratio, weight distribution. With those items correct a 9 second Cal track car will hook fine. Personally dont think I would run a low gear set. Costly and ineffective. It wont make any significant change. Certainly wont help R/T. My 63 Dodge (3400lb low 10second on 10.5 tire) ran a 4.88, 4.56, 4.10. Made less than .10 difference. Want to pick up R/T? Install a pro trans brake. Trans is getting freshened anyway.
Doug
Doug
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MiradaMegaCab
Well-Known Member
Hmm, TranZbrake and a low gear set!!
66Satellite47
Well-Known Member
All depends on the rest of your whole combination. Heavy car, big tires with enough torque to handle the RPM drop into 2nd gear, may like it. But I never used one. 2.45 was enough for me. Guess I agree a good trans brake will do more for the 60 ft.
Getting my 63 wagon ready for the track. Took out the deep low gear and went back to the 2.45 with a higher stall converter. Depending on your car, the ratio from the deep low gear to second gear is so great that it takes the motor longer to to reach rpm for the shift into third gear. I'm using a 2 step with the higher stall converter and cal tracs. It should 60 ft just fine. Just my thoughts and what others are running. Good luck.
fbs63
Well-Known Member
If the car has 680 hp and is quicker with a low gear set you have the wrong convertor.
We are underpowered with only 680fwhp/720ftlbs
440rb
Well-Known Member
All new complete combo for 2020..only 12 runs on it, 680hp is corrected track hp=weight/mph. 695hp was dyno. Converter is a TCI proX 3600>4200, max torque is@4400, I think its a bit too tight myself but wasn't my decision, neither was the low 1st, we shift@5800, trap@6200+...max power is@5500 drops a bit and comes back at 6000 with current tiny 950HP carb which pulls around 956cfm@traps.
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