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Old 11-12-2003, 07:34 PM
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Truck transmissions for a hotrod project.

I don't know anything about transmissions, so if anyone has a good understanding, a recommendation would be much appreciated. I am planning on putting a 350 that advertizes 330HP in an old Chevy pickup. It looks like I'll be buying a brand new manual transmission, because I need one that can handle the horsepower. I'm told that the 700r4 is the best for the application, and is great for going fast. But I want to have it both ways, so is there a way to set up a granny gear, or is there a transmission that's better for this situation? As I said, My knowledge here is lacking. thanks.

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Last edited by Demogorgo; 11-13-2003 at 04:53 PM.
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Old 12-03-2003, 02:41 AM
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What you might try as a starter is an old Saginaw 3-speed tranny. They are a dime a dozen at the auto swaps. You can get a fresh rebuilt trans for 150 to 200 dollars, used but good for under 100. These are strong trannys and came in Chevy and GMC pickups between about '67 and '73 or so. I'm running a '68 Sag in my '64 El Camino (changed the driveshaft to '68 Chevelle) with a seriously built small journal 327 and 3.73:1 rearend. I put the Corvette needle bearing pilot and it shifts like butter. That way I shift once and all those 4 and 5 speed guys rowing their stick see is my taillights. The first-to-second shift wins the race, second-to-third just carries you over the line.
Anyway, I think the three speed would be a good, cheap place to start and get the truck on the road.

Good luck!
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Old 12-03-2003, 09:18 PM
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At 330HP the 700R4 is a good choice. It can handle the HP and with a 3.06:1 first gear it it will be like a granny gear. Couple that with the .7 overdrive and with a set of 4.11 rear end gears(common on alot of older pick-ups) you will have a 2.88 final drive ratio.....great for the highway and in an automatic the torque converter multiplies the torque for even better low end grunt. If you want to compare low gear ratios...take your manual trannys low gear ratio and then compare it with the 3.06 of the 700R4. Just think of the ease of drivability with the automatic and it being different. Isn't that what rodding is about? Oh ya and having fun!

Last edited by hasanybody1; 12-03-2003 at 11:28 PM.
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Old 01-12-2004, 04:54 PM
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Thanks for the advice, guys. Both of those solutions sound doable.
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