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Old 05-10-2008, 11:08 PM
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Turbo 350 or Turbo 400

For my '69 Chevy C10 stepside shortbed my dad wants to put a turbo 400(auto) in it but he swapped it for a 350(auto) in a '73 or '74 El Camino he gave to his buddy and he ended up selling it b4 dad could pull the transmission out. It would be cheaper to rebuild the 350 then buy a 400. We got a 400ci small block.All I could find out online is the 350 is better HP and 400 wastes the power. I'm still undecided though.

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Old 05-10-2008, 11:13 PM
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turbo 350 or turbo 400

I have had some experience with both, the th-400 seems a bit heavier but is a very strong transmission, the th-350 is also a very good trans and if in a street car with moderate hp I wouldnt worry about either. I have a good th-350 with a shift kit and stall converter for sale by the way.
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Old 05-10-2008, 11:22 PM
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Both are good till 500hp. Then it's the 400.
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Old 05-10-2008, 11:40 PM
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Thanks but no thanks we already got a 350 and I forgot to say we have a 700R4 transmission to also automatic but both need to be rebuilt. 350 does good in reverse but goes slower than a snail in foward. I forgot what was wrong with the 700.
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Old 05-10-2008, 11:51 PM
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RE: th-350 or th-400

well if I were you I would go with the 700 r4 due to the fact it has an overdrive and its low first gear. but thats just my opinion
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Old 05-11-2008, 12:18 AM
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I've been searching the internet for a while now but there is no clear info on the diffs. for the 350,400,and 700 execpt for the 400 is heavier and needs more power to make it turn and the 700 is the 4-speed version of the 350. I'm starting to get really confused because everything posted about them is for off roaders and I'm building a street truck.
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Old 05-11-2008, 01:00 AM
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RE: 350 vs 400

I don't think there is any reason to get confused. could be your over thinking it. it wont make much difference which one you pick. decide if you want overdrive if so then you have one choice, if not then your down to 2 choices, flip a coin and now you have made your selection. but like I said with the exception of overdrive they all have strong and weak points and very simular features so it really doesn't matter between the 350 and 400 trans. good luck
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Old 05-11-2008, 01:11 AM
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What is overdrive I can't really get that clear of an answer from any other gearheads in the family. All i get is it has to do with rpms and thats it .
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Old 05-11-2008, 02:16 AM
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Most Overdrive Automatic Trans have 4 gears. Some the new ones have 5 or 6 gears. The TH350 & TH400 have 3 gears with a 3rd gear Ratio of 1to1. The TH2004R has .67 4th gear = 33%. The TH700R4 has .70 4th gear = 30%. The TH4L80E has .75 4th gear = 25% reduction. Say your engines turning 3000rpm at 65mph with a 350 or 400 trans, if you have the .67 4th gear of a 2004R with the TCC/TorqueConverterClutch locked your engine would be turning 2010rpm at 65mph.
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Old 05-11-2008, 10:43 AM
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RE: 350 vs 400

the extra gear from the overdrive lowers rpms, that means the engine is turning slower, not working as hard and that means better gas mileage. You may not be driving yet but trust me gas mileage is becoming more important everyday.
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Old 05-11-2008, 11:55 AM
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Thanks alot you guys and I do know the importance of gas mileage sometimes I have to put money in my moms truck a 97 Ford F150 Lariat (don't really like more of a Chevy guy personally) and its mileage sucks it gets about 11 or 12mpg on the street and 13 for highway. Now gas is close to $4 in Northern Calfornia cheapest you can get is $3.85
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Old 05-11-2008, 02:49 PM
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if i where you i would go with the 700. all over drive does is use the gears in the tranny to bring the rpms of the engine down in turn saving you gas. for example. . . 45mph with a 350th the rpms would be around say 2000 with a 700 the rpms would be around 1600. thats just an example. its not correct with math and all that. but it gives you an idea what overdrive does.

typical gear ratios for a 350 are 1st 2.52 2nd 1.52 3rd direct drive 1:1
typical gear ratios for a 400 are 1st 2.48 2nd 1.48 3rd direct drive 1:1
im not sure what the gears are for a 700 but the final gear in a 700 are lower then direct drive something like 0.83ish

think of over drive as the hour hand on a clock it turns much slower then the other hands

i have a strong rebuilt street/strip 350th shift kit, adjustable vac modulator, and a few other goodies i cant remember lol. with a stall speed of 2500 for the torque converter.

if you dont have a wild cam then stick with a stock stall speed the higher the stall speed the more gas you need to give it to get rolling. in turn it lowers your gas mileage. but for the street if you do need to go with a stall speed dont get any bigger then 2800 3000. anything more on the street is over kill.

from what ive learned about the 350th is that its kinda like the 350sbc its very popular very strong (if built right) and will out last most anything (again if built right).
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Old 05-11-2008, 03:35 PM
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How much would it cost to rebuild a 700r4?
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