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Old 04-07-2012, 08:59 PM   #1
Allanski
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What rear gears for a 4L80?

Car is for weekends only, will need to drive on highway to Camarofest. I want some good 60' times and great 1/4 mile times. I was considering 373? Any suggestions?
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Old 04-07-2012, 09:04 PM   #2
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Power? type of power adder?
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Old 04-07-2012, 09:22 PM   #3
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Supercharged and should be 700 to rear wheels.
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Old 04-07-2012, 10:13 PM   #4
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3.90 or 4.10 are going to give you best 60' and 1/4 mile et but you will be in higher rpms for highway driving.
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Old 04-08-2012, 08:02 AM   #5
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Is there a halfway set up between 3.73 and 3.90?
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Old 04-08-2012, 11:29 AM   #6
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Supercharged and should be 700 to rear wheels.
pd blower i would go 3.50 if your not trying to set a 1/4 record and 3.73 if you have a centri charger
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Old 04-08-2012, 12:01 PM   #7
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pd blower i would go 3.50 if your not trying to set a 1/4 record and 3.73 if you have a centri charger
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Old 04-08-2012, 05:48 PM   #8
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He is saying its for weekends only and wants best 60' and 1/4 et. Only time he says it will be on highway is for camarofest. If you want a track performer go 3.90 or 4.10.
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Old 04-08-2012, 07:34 PM   #9
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He is saying its for weekends only and wants best 60' and 1/4 et. Only time he says it will be on highway is for camarofest. If you want a track performer go 3.90 or 4.10.
I would disagree ,especially with a pd,you wouldnt put alot of gear in a diesel would ya .With over 700 rwhp he should be out of gear by the 1/4 with a 4.10
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Old 04-08-2012, 07:41 PM   #10
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I would disagree ,especially with a pd,you wouldnt put alot of gear in a diesel would ya .With over 700 rwhp he should be out of gear by the 1/4 with a 4.10
4.10 maybe....but at that power level my 3.90 put us right through the traps at mid 6k range....perfect.
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Old 04-08-2012, 08:04 PM   #11
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4.10 maybe....but at that power level my 3.90 put us right through the traps at mid 6k range....perfect.
Keep in mimd this is an auto and he will have some converter slip ,with a pd we have found they et better when you let them spend more time in there power band insted at upper RPMs .I would have loved to run your car with 3.50s
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Old 04-08-2012, 08:36 PM   #12
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Keep in mimd this is an auto and he will have some converter slip ,with a pd we have found they et better when you let them spend more time in there power band insted at upper RPMs .I would have loved to run your car with 3.50s
Yeah...me too. The good thing about that combo I had is almost the entire rpm range is in the powerband. Big, broad and flat torque curve made it pull hard the entire time. A PD blower is a recipe for permagrin for sure.
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Old 04-08-2012, 09:59 PM   #13
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Is there a halfway set up between 3.73 and 3.90?
What gear do you have now?
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Old 04-08-2012, 10:26 PM   #14
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I ran 3.73 with 727rwhp with the tvs2300 and wish i had more gear. I have run everything from a 3.25 gear to a 3.90 with 3 different combos and think i have a pretty good idea what works in these cars as i have also run a manual and auto as well.
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Old 04-08-2012, 10:55 PM   #15
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I ran 3.73 with 727rwhp with the tvs2300 and wish i had more gear. I have run everything from a 3.25 gear to a 3.90 with 3 different combos and think i have a pretty good idea what works in these cars as i have also run a manual and auto as well.
What was your 60 ft? What's your 1/4 mile? Is that 727 through an auto?
I also think a 350 gear would be about right.
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Old 04-09-2012, 10:57 AM   #16
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My 60' with the tvs2300 was 1.5's thru a manual and low 11's were best i could manage. I was always stuck between 3rd and 4th gear going thru the traps with 3.50 gears. Now that i am running even more power and an auto the 3.90 is really close so once my new setup is finished with even more power i think they will be dead on.
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Old 04-09-2012, 11:33 AM   #17
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My 60' with the tvs2300 was 1.5's thru a manual and low 11's were best i could manage. I was always stuck between 3rd and 4th gear going thru the traps with 3.50 gears. Now that i am running even more power and an auto the 3.90 is really close so once my new setup is finished with even more power i think they will be dead on.
Nothing personal but in our experience with maggies they like to pull,if you were running 11s with over 700rwhp there was something else going on.We run alot of 1/8th mile around here and we need a gear to get us through the 1/8th in 3rd .I have a little less than 700 hp with my car with a 3.64 gear and im changing it out for a 3.50 .I set the sixspeed record in 06 with the GTO with a 3.31 gear,but we run 26 tall tires so that works out to the 3.50s..with a lil over 600 hp...Its just an opion and others have theres im just sharing what has worked for us.I will be disapointed if you keep your 3.90 gear becuase im thinking your car is going to be one of the fast ones If you can run a 3.90 gear without turning over 6800 your alot slower than i thought you would be
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