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Old 01-16-2007, 09:53 PM
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Gears or OD for my sons car

My 11 year old son bought a 71 Vauxhall Firenza and it is getting a 350 swapped in. The motor will be fairly mild and hopefully make around 350 at the flywheel. The car will weigh about 2700# with driver. The biggest tire we can stuff in the wells will be 25" tall. We are considering a 3.73 rear out of a 2 wd 92 S-10. I realize this isn't a real tough rear, but they are cheap and plentiful, and almost the perfect size for this car. With a TH350 he should be turning about 6000 rpm at the end of the quarter mile, but his fuel economy is going to suck for everday driving. A 700r4 will get the rpms way down for cruising, but would this 3.73 gear be optimal for 1/4 mile times with the 700 or should we go even lower?? How durable would a "stock" 700 be at this power level?? Should we use the th350 and run less gear?? Thanks

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Old 01-16-2007, 10:40 PM
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You might look at a 200-4R OD transmission rather than the much larger 700. I seem to remember that the Vauxhall is similar in size to an old Rambler American isn't it? You don't have much wheelbase to be using a 700 or you might end up with a 6inch driveshaft.
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Old 01-16-2007, 11:04 PM
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pasadenahotrod, Thanks I know the th350 will work fine, so a 700 can't be too much bigger, can it? Is a 700 any "porkier" around the bell?
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