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Old 03-14-2006, 07:49 PM
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Help picking gear's

Well i have a 351 Cleavland 400 + horse and torque and a brand new rebuilt C6 with lots of performance parts. and a 9 inch i would like to change my 2.79 gears.. so.. im building a new third member up for the strip.. the motor will be turning 5500 tops.. at the end of the quarter. Any suggestions on what ratio i should use? I have a spare set 3.50 but will this be enough? I want to build the race carrier once.. not spend more money on it trying different ratio's ! so once again im in your hands folks... thanks again

bill
ps. im not sure.. what intervals they go up buy ... like 3.50 .. 4.11 in between i don't know.. i think 3.73's are chev.. if you could tell me the different ratio's there are.. (under 4.11) haha sweet thanks again

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Old 03-15-2006, 12:03 AM
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Which vehicle? weight? torque and power peaks? cam? manual or auto? What stall? What ratios of gears in the tranny?
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Old 03-15-2006, 12:32 AM
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Use this -REAR GEAR CALCULATOR- to get you into the ball park. For TRANS RATIO, use as the C6 is direct in third gear.

You will then most likely have to refigure your stall speed on the convertor for maximum performance.
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Old 03-15-2006, 06:53 AM
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holey moley.. ok..hmm well its peak power is 417 horse and 420 torque C6 auto with 1900-2100 stall . The car is a 70 Mercury Cougar weighing in at 3100 lbs. Also the cam is " medium " its a 250 mega isky grind(is what the builder told me when he put it in) Im sorry this is all i can tell you I really wish he had told me the cam specs when i got it back from the shop but hindsight is 20/20 right. I know im not gonna get into the 10's with this car but i would like to see it in the 13's (with some work) I also know to have a truly fast car you need to look at so many angles like weight suspension power stall but, i believe this car has potential. thanks again

bill C
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Old 03-15-2006, 07:06 AM
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OH and i checked out the calculator and at figured that i will need about 3.75 with 28 inch tires and doin 5000 rpm at 110 . Now if you could tell me what time is that at the quarter .. about how many sec. is a 110 pass .. yess i know its not exact but.. with in 1.5 secs.. should be good enough for me
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Old 03-15-2006, 02:55 PM
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None of that considers that a non-lockup torque converter transmission is given a normal accepted slippage range of around 10- 20% depending on many variables in the transmission, so I would also figure into the equation a round-about slippage factor of 15 % into your 5500 rpm ceiling, this will also give a sort of safety factor.

I see gearsets available for the 9-inch in: 3.00, 3.10, 3.25, 3.33, 3.40, 3.50, 3.55, 3.70, 3.89, and many more.

The small spread between these sets available can get you more closely set up to where you need to be.
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Old 03-15-2006, 04:12 PM
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Sounds like 3.70 would be perfect. One to either side (3.55 or 3.89) would do well too. There will be plenty of torque availabe so you don't want to waste it with too much rear so I'd avoid anything 4 and up numerically.
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Old 03-15-2006, 06:23 PM
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Well i talked to some people.. and they knew people.. and well scored new axle and carrier bearings and seals.. and setting up my carrier with my 3.50 gears and.. a trac- lock locker.. for $600.00 cdn ! not bad.. so now the only question is

Does a trac -lock locker have clutches or is it a "locker" without? Either way it will be in good shape with a 6 month warranty on all work and parts! I've heard of clutch's in diffs being " tightened up " .. is this possible and could you explain it ?
oh im gettin exited haha

bill
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Old 03-15-2006, 10:40 PM
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Quote:
Originally Posted by "70" Cougar

Does a trac -lock locker have clutches or is it a "locker" without? Either way it will be in good shape with a 6 month warranty on all work and parts! I've heard of clutch's in diffs being " tightened up " .. is this possible and could you explain it ?
If it a FORD TRACTION-LOC, it is a good street-strip unit. One can insert an extra disc to tighten the application of the assembly. That should be somewheres down the road for you. Get it to run right first.

E.T. is hard to call as it combines reaction time with vehicle elapsed time. MPH through the traps gives a better indication of HP applied.
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Old 03-15-2006, 11:05 PM
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Ok good good.. so its a solid unit , i like to hear that ! OH i cant wait. I could go pay for tomorrow but... my better judgment says wait one more paycheck to be safe. lol i like to have a bit of "buffer" in the money department ! Thanks lots

billC
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