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Old 05-13-2010, 08:38 AM
Rank Rank is offline
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Default TH350 behind a Big Block

... seems to me that would be the weak link in the power train. Why not stick with the tried and true TH400??

I plan on running a 454 and automatic. I have a couple of TH350s on hand and one questionable TH400 out of a truck which I would hate to install and then pull due to the situation that it might be worn out. Is the TH350 a tested replacement?

Any advantages to running the TH350?? All I can think of is negatives.

....... be my guinea pig! LOL

Last edited by Rank; 05-13-2010 at 08:40 AM.
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Old 05-14-2010, 05:07 PM
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No other responses, well I'll start. Chevy used the 400 behind the big blocks for a reason. That's not to say a properly rebuilt 350 won't hold up but if it's still at stock specs it's not going to take the abuse a 400 will.

If you have a couple of 350's throw one in and see how it holds up. I know it's work installing it but if you have them it won't really cost anything.
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Old 05-14-2010, 09:09 PM
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Already have a driveshaft?
If so, whats it originally from? PG yoke and D-shaft length will work with a TH350 as is (assuming short tail housing)...the yoke is different for a TH400 and the shaft will be shorter.
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Old 05-15-2010, 02:35 PM
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Right on the shafts being different .... I think it is spline count? I was thinking of using the 350 stock shaft with a 400 yoke .... if I went with the th400. Is that doable?
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Old 05-15-2010, 02:37 PM
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Quote:
Originally Posted by Hank70SS View Post
No other responses, well I'll start. Chevy used the 400 behind the big blocks for a reason. That's not to say a properly rebuilt 350 won't hold up but if it's still at stock specs it's not going to take the abuse a 400 will.

If you have a couple of 350's throw one in and see how it holds up. I know it's work installing it but if you have them it won't really cost anything.
Hank maybe I am greedy but I want to learn from someone elses bad expierence! LOL ... swapping trannies is not my favorite chore!
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Old 05-15-2010, 05:57 PM
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Quote:
Originally Posted by Rank View Post
Hank maybe I am greedy but I want to learn from someone elses bad expierence! LOL ... swapping trannies is not my favorite chore!
I hear you, I know a there are quite a few 350's running behind some pretty stout motors. They're probably not stock 350's though.
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Old 05-15-2010, 06:44 PM
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Quote:
Originally Posted by Rank View Post
I was thinking of using the 350 stock shaft with a 400 yoke .... if I went with the th400. Is that doable?
Yeah but you'll have to shorten the driveshaft...about an inch or so.
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Old 05-16-2010, 04:18 AM
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If given the choice, wouldn't it be money better spent on the more stout trans ?

I know our small block is no slouch but given the choice id choose the TH.

Then this brings up the question of rear ends. Is that the weak link before the trans ?

Dave
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Old 06-04-2010, 06:50 PM
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This is an older post and may have already finished but here we go.The turbo 350 has advantages.Its easy to find a cheep rebuildable core and cheap to rebuild.Its lighter and reduces your unsprung wheight and uses less power to run which means more power to the wheels.Will handle 500hp all day long.The 400 is stronger but I wouldnt loose any sleep over it.If you have any spare 350s pull it apart and youll see how simple these things realy are.All you have to do is be carfull when putting it back together you dont damage and seals and your golden.
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