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Old 11-24-2005, 08:26 AM
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TH 350 & TH 400 Converters

Can someone tell me if I can use a TH 400 converter (from a 472 Cadillac) in a TH 350 trans??? The splines and the "nose" looks identical but the one from the 400 is a little bigger in diameter and like one inch thicker.

Thanks a lot.

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Old 11-24-2005, 10:45 AM
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th350 and th400 converters

yes, you can. but the one difference i've found is that the th350 converter uses a smaller bolt circle to bolt it to the flexplate. make sure you check to see if the bolt tabs line up to the holes in the flexplate before you put it together. i found this the hard way, after putting everything together and waiting until the last to bolt the converter to the flexplate......nothing makes a long day better until you find out you have to take everything back apart............easy fix though, just get the correct flexplate for that application with that transmission, or an aftermarket one if a factory one isn't available. also, make sure you measure the pilot stub to make sure it will fit in the crank. i've never ran into one yet that won't work, but best to check to make sure.........
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Old 11-25-2005, 07:44 PM
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Could we get a mod to move this to the transmission forum?


In a while, Chet.
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Old 11-26-2005, 04:00 AM
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Another thing to consider is change in stall speed with a change in torque converter diameter. As an example, if you have a 4000 stall speed with a 9 inch converter and you go to a 10 inch with identical internal (blade) design, the stall is changed as follows:

new stall speed = 4000*(9/10)^2.5 = 3074
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Old 11-26-2005, 11:54 AM
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hey, way cool on the stall math, where did you get that from? how accurate is it?
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Old 11-26-2005, 12:59 PM
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Basic physics.

The torque capacity of a hydrodynamic coupling is proportional to the fluid density, the square of the rotating speed, and the fifth power of the diameter.
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Old 11-26-2005, 02:21 PM
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basic physics ? what
?

lol


make sure the converter is the same one, lockup vs. non lockup, they dont interchange, lockup hvae three sets of splines vs. non lockup only having two

all stock converters i ahve ever seen other than vega or s-10 are 12" heavy suckers

and most all flexplates have both sets of bolt patterns in them for the different convters bolt patterns- 6 holes*



good luck
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