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#1
05-28-2022, 04:02 PM
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Th400 overdrive?
Are there gears available to run a th400 with a 2.52 first 1 to 1 (or something close) second and an overdrive third? I’ve raced a car with a power glide and I’m just wondering that with all the torque pontiacs make why couldn’t we use first and second like a glide and third as an overdrive?
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#2
05-28-2022, 04:28 PM
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TH400 3rd can only be 1:1, so no OD gonna happen.
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#3
05-28-2022, 05:04 PM
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GM started making a T 400 with OD in 1991, it's called the 4L80E.
__________________
Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
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#4
05-28-2022, 05:18 PM
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You can buy a lower 1st gear, make it a 2.75, but it's still 1:1 3rd. But this allows taking some rear gear out of the car maybe to something a little more highway friendly. There are quite a few companies that market it, ATI, Hughes, Coan etc... Coan makes a 2.75-1.56 setup for the 400. All this gets a little spendy for not a whole bunch of gain. Then you have to figure out what rear gear you want to tolerate and try to bandaid one end to help the other.
Which is why I just go 4L80E and done with it, so I can keep my rear gear where I want it, and enjoy a lockup converter along with a .75 overdrive. Not cheap either but way more benefit. |
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#5
05-28-2022, 10:32 PM
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Still have the Gear Vendor option also.
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[/SIGPIC] Two marriages and one long term relationship later and it's the T/A that's always still there. When referencing gas, "regular" used to have an entirely different meaning. |
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