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post #1 of 2 (permalink) Old 12-28-2015, 10:53 PM Thread Starter
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New car new Transmission

Hello everyone, building a new drag car and I'm honestly torn over what transmission to run. I'm die hard ford and love the C4 but one thing I don't want to do is have it be a chore and be unreliable. I had myself set on buying a power glide since I now need a new converter, driveshaft, making new headers ect. Now ls the time to switch if doing so. The engine is a 408 Windsor base, 12.5:1 compression, AFR225s and will have a small shot on it (100-150hp) I'm going to say the car will go 9.40s - 9.60s and weighs around 3000 pounds race weight. what do you all think? If I can make it live and only doing clutches one time a season id be fine with that.
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post #2 of 2 (permalink) Old 12-29-2015, 09:22 PM
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I just wrote you a manifesto about this but my phone died and it was lost. To recap, I would NOT go to a glide unless you have a real high torque setup. Glides are great for huge inch(think above 500) or big torque ie. Turbo and blown. 408s typically are strong torque setups, for a smallblock, due to the longer rod and higher piston dwell. But if your under 500 ft lbs this will mean a long long time in low gear. Also with a higher powerbamd and shift point, you will likely find a serious issue with torque converter selection. A low stall will make you lug off the start as you will be a couple thousand rpm below peak torque but will be ok once in high gear. A big converter will help you 60 ft like a champ but will likely allow the motor to fall back into the converter on low high shift. Keeping the motor in the powerband (above peak torque, below peak power) is key. This has been my experience, typically on the higher rpm motors, I like to Go the other way. 4 or even 5 speed of possible. The tighter gear ratios keep the rpm up during upshifts. Big ratio changes mean big rpm changes. I like to keep my powerband tight and let the motor sing. Take a look at prostock cars. Never off the powerbamd. Or even better look back a few years at prostock trucks. 355 cu in max and flat haul the mail. All with lencos or jerico style trans. A good c4 is solid to around 1000 hp. Look for an upgraded planetary and servos. Also go with alto clutches and a good setup. Talk to PA transmissions or Hughes. PA makes a lot of the parts your looking for
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