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Discussion Starter #1
right now i have a 350 transmission in one of my rides,i know it will probaly go out soon cause i just got the motor redone,

now my question is wich trans do u recommend for a motor with a little extra horse power. should i rebuild the 350 or get a 400 trans?

i do plan to haul soem ass,smoke some rubber and cruise .

any info will help.
 

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Stick with the TH350, for several reasons. They're excellent transmissions, and you can build them to suit just about any horsepower level. They're lighter than a TH400, and rob less power, so ultimately you'll get better gas mileage. Also, you already know it will bold right up, so you won't have to change your driveshaft. ;)

Cheers,
Jeff
 

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:biggrin: THAT IS TRUE A TH350 IS BETTER THAN A TH400 AND IF YOU GET IT BUILT RIGHT IT SHOULD LAST A LONG TIME
 

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I was told the oppsite from my tranny guy, I had a 350 rebuilt for my 68 because I though I had a powerglide. When I got the car to the shop He told me that I had a 400 and I should have it rebuilt and keep it because it was a better trans.
 

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400 is better,,and you know you dont need to worry about driveshaft
 

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i was reading that a 350 and a 400 are about the same thing but the 400 is more towing and heavyduty and a 350 is more for racing
 

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Here are some common tranmission gear ratios:

Transmission
Model First Second Third Fourth Reverse
Rear Wheel Drive:
TH-180C (3L30) 2.400 1.479 1.000 --- 2.000
TH-200-4R 2.741 1.568 1.000 0.674 2.067
TH-300 (Jetaway)
TH-350 2.52 1.52 1.00 ---
TH-400 (3L80) 2.482 1.482 1.000 --- 2.077
TH-700-R4 (4L60) 3.059 1.625 1.000 0.696 2.294
4L30-E 2.400 1.479 1.000 0.723 2.000
4L30-E Optional 2.860 1.620 1.000 0.723 2.000
4L60-E 3.059 1.625 1.000 0.696 2.294
4L80-E 2.482 1.482 1.000 0.750 2.077



1) the 350 weighs less.
2) the 350 has a slightly lower first gear (2.52 vs 2.48).
3) and finally the supposed HP loss difference.




or click here http://www.442.com/oldsfaq/oftrn.htm#TRAN%...on%20Comparison
 

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th400s have the advantage for big blocks/big cars but a th350 can be built strong enough for basically anything... unless youre building a drag strip car with 600 + ft/lbs of torque

Plus 400s do take less power to run
 

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Originally posted by crenshaw magraw@Aug 4 2005, 12:29 PM~3541137
right now i have a 350 transmission in one of my rides,i know it will probaly go out soon cause i just got the motor redone,

now my question is wich trans do u recommend for a motor with a little extra horse power. should i rebuild the 350 or get a 400 trans?

i do plan to haul soem ass,smoke some rubber and cruise .

any info will help.
go with the 400 if you have the money!! what car is it for? if its for that big ass chevy you bought i would go with the 400 thats a heavy ass car and 400 would work better for you especially if your thinking of filling the trunk with batteries :biggrin: !
 

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Just got my car from the tranny shop, stock 327 with TH400 from factory. Man this car hauls ass........
I have not driven an old school V8 in a long time.....boy it's nice to be back....

The car is a 1968 Impala Fastback........mech said it was probly special order with the TH400.....
 

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if you have a big block then get a 400.

if you have a small block then get a 350


You said that you are looking for horsepower and to my knowlege the 400 is better for torque.
 

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Discussion Starter #19
sounds cool,thanks for the pointers,i will most likely go with the 400 trans after i wear out my 350 trans.
from what i hear it sounds like the right way to go, but again the 350 with a shift kit sounds cool,but i would have to re do my rear end before i go that route.

i'll run the 350 till it goes out.
 
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