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Old 02-16-2005, 11:56 AM
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Question tranny 350 or 400

Should I go with a 350 with a shift kit or a 400 for a 70 Chevelle 350 over .30 for street and occasional strip?I know a 400 is bigger but is bigger always better?Eventually (soon)I want to put a posi trac on this bad boy This is how I feel ,because I want to do it all at once instead of piece here then go back and piece here.Am I making sense

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Old 02-16-2005, 12:07 PM
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A well built th-350 should be more than enough. It takes less HP to turn and can withstand a decent amount of power going through it.
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Old 02-16-2005, 12:08 PM
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Been discussed MANY times with as many opinions as posters! In general I like the 400 for a performance application 'cause it was designed by the factory to handle more torque. Negative is that it reportedly consumes a little more power to spin it but that argument doesn't impress me as being significant. If I has a super light 10second dragster, I would go with a totally trick Power-Glide. If I had a heavier race car I would go with a totally tricked out 350. But for a street/strip car that I wanted to abuse a little and didn't want to have to spend the national debt beefing up or didn't want to worry about working on a tranny all the time the 400 is my choice.
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Old 02-16-2005, 02:10 PM
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I like the 400 because it doesn't use the stupid throttle cable like the 350 does. That throttle cable messes with my carb linkage!. Plus the 400 handles a lot more power in a stock configuation than a 350.

Use a shift kit, and adjust the shift points with a govern kit. The kick down is electronic on a 400 so you will need to fabricate a plate to hold the long throw switch.

The 350 trans feels wussy to me unless they are raced preped with a full manual valve body.
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Old 02-16-2005, 02:33 PM
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tranny

I use the 350 with red friction plates, hardened front sprag, and a stage 2 B&M shift kit. You don't have to use the kick down cable.

I take the kick down cable off and snip it just where the cable part starts on the tranny end. Then fill the cable stub with rtv and put it back on the tranny.
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Old 03-17-2005, 01:40 PM
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Hey thanks a million guys for helping me with my 350 or 400 ?.Now there is a new on for you .I just caught an 85 Silverado C-10(short bed) 350 with 400 tranny.Any idea on the type of rear end?
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Old 03-17-2005, 04:27 PM
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Quote:
Originally Posted by heavychevy70
Should I go with a 350 with a shift kit or a 400 for a 70 Chevelle 350 over .30 for street and occasional strip?I know a 400 is bigger but is bigger always better?Eventually (soon)I want to put a posi trac on this bad boy This is how I feel ,because I want to do it all at once instead of piece here then go back and piece here.Am I making sense

Why use a 400 when a 350 will do the job just fine and as a bonus a 350 is slightly cheaper to build, lighter, robs less power, and has better gear ratio spacing.
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Old 03-17-2005, 04:28 PM
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Stick with the 350 tranny on a small block. The 400 trany chews up 38 HP vs 28hp for the 350. You do the math. If I were you I would go with a gm 700 tranny any day of the week
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