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Will a th400 be a good choice for my setup?

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Old Feb 20, 2014 | 08:04 PM
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Default Will a th400 be a good choice for my setup?

hey guys so im hoing back and forth trying to decide what route to go on transmission selection, heres the vehicle setup

92 lexus sc300 gutted 3350# wet weight no driver (i weigh 140)
cammed nitrous lq9 approximately 600 RWHP on bottle
4.26 rear end gear ratio (welded diff)

i should be able to clear a 28" tall rear tire if not ill make the neccasary "modifications"

will a th400 be a good trans for this setup i do some highway driving but no alot and i dont fly on the highway. im more of a 0-100 kinda guy i dont do highway pulls. im thinking first gear will be violent with this setup.

also what stall would everyone reccomend the cam is the Tick Polluter cam V2.
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Old Feb 20, 2014 | 08:10 PM
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Originally Posted by mechanix565
hey guys so im hoing back and forth trying to decide what route to go on transmission selection, heres the vehicle setup

92 lexus sc300 gutted 3350# wet weight no driver (i weigh 140)
cammed nitrous lq9 approximately 600 RWHP on bottle
4.26 rear end gear ratio (welded diff)

i should be able to clear a 28" tall rear tire if not ill make the neccasary "modifications"

will a th400 be a good trans for this setup i do some highway driving but no alot and i dont fly on the highway. im more of a 0-100 kinda guy i dont do highway pulls. im thinking first gear will be violent with this setup.

also what stall would everyone reccomend the cam is the Tick Polluter cam V2.
With that gear even with 28" rear tires it is going to be like 3,500 rpm at around 60mph give or take. I ran 4.10s with my th400 and 28" drag radials with my old nitrous motor and it sucked *** for driving because it was always between 3,500-4,500 and it was loud as **** and droned like a bitch inside the car. I can only imagine a 4.26 rear gear.
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Old Feb 20, 2014 | 08:18 PM
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the 4.26 gear is gonna be swapped for a 3.92 in the next couple months. will it be better then? im trying to put the car deep in the 10's just want to make sure i wont run out of motor by the end of the track
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Old Feb 20, 2014 | 11:21 PM
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so what im thinking as of right now is 3800 stall, th400, 3.96 gear w/ a 27" tall drag radial on some 15" draglites the 27" tall tire with a 1.0.1 final ratio should put me at 6400 rpm at 130 mph which is where i think is a safe trap speed for low 10's i dont care about turning 3200 rpm on the highway at 65 doesnt bother me car isnt bieng built for fuel efficiency my only other rear gear option is 3.23 and i think thats way to low input please
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Old Feb 20, 2014 | 11:25 PM
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I would call and speak with whoever will be building your converter. Im not so sure the rear gears will be as much of a roll as you may think with a good stall. You do not get lockup with the th400 so that also hurts highway cruising.
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Old Feb 20, 2014 | 11:45 PM
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sorry if i sound stupid but what do you mean by as much of a roll, also i live in a real small state i dont do alot of highway cruising an i dont commute its more of a street strip kinda deal for grudge racing
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