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Old 05-25-2006, 10:17 PM
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THM-400 behined a diesil 6.2

Went to the local truck junkyard today looking for a trans. I am going with a 400 and placing it behind my 350. I found one in a like a early 80's like short bus. It is bolted up to a 6.2 diesel. I was wondering if the trans has anything different to it than the average 400 you would find in a regular pickup. I ask this being that the vehicle is so big I was thinking that maybe the factory may have installed a factory type shift kit or it has different shift points being that a Diesel isn't I higher revving motor???

Thank you's in advance for any comments?

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Old 05-25-2006, 10:22 PM
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400 6.2 diesel

Yes there is some differences, the diesel has a different governor and the torque converter may have a lower stall speed.
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Old 05-25-2006, 11:35 PM
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The torque converter has a little bit of a cult following. I own one and refuse to sell it Its a very low-stall unit with (of course) the six-bolt pattern. It wouldn't do well behind most gas engines, but I got one for my Caddy 500 since my cam actually stalls below factory. It stalls at about 1400 behind my caddy, not sure where its rated to stall behind the 6.2.

Anyway, if you don't care about it, send me the TC, rebuild the 400 with a more appropriate stall converter, and be done with it I suggest against turning in that TC as a core for a couple reasons. first, its valuable to the right person, and second, the rebuilder will throw it in a rebuid pile and some poor unsupecting guy will get it assuming its a stock replacement TC and be disappointed when it stalls at 1200 behind their 383.

As far as I know, the only differences in the trannys are governor springs, and of course there is no vacuum modulator (since diesels don't create vacuum). I'm not sure what's in place of the vac modulator, but I know the cases are the same, so its a no-brainer. A typical rebuild kit includes a vacuum modulator anyway. Otherwise, aside from tuning differences which will all be addressed during a rebuild anyway, they are pretty much the same. The 6.2 had a similar enough torque curve to the 454 of the day that they were darn close in tune
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Old 05-26-2006, 06:30 AM
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Quote:
Originally Posted by curtis73
The torque converter has a little bit of a cult following. I own one and refuse to sell it Its a very low-stall unit with (of course) the six-bolt pattern. It wouldn't do well behind most gas engines, but I got one for my Caddy 500 since my cam actually stalls below factory. It stalls at about 1400 behind my caddy, not sure where its rated to stall behind the 6.2.

Anyway, if you don't care about it, send me the TC, rebuild the 400 with a more appropriate stall converter, and be done with it I suggest against turning in that TC as a core for a couple reasons. first, its valuable to the right person, and second, the rebuilder will throw it in a rebuid pile and some poor unsupecting guy will get it assuming its a stock replacement TC and be disappointed when it stalls at 1200 behind their 383.

As far as I know, the only differences in the trannys are governor springs, and of course there is no vacuum modulator (since diesels don't create vacuum). I'm not sure what's in place of the vac modulator, but I know the cases are the same, so its a no-brainer. A typical rebuild kit includes a vacuum modulator anyway. Otherwise, aside from tuning differences which will all be addressed during a rebuild anyway, they are pretty much the same. The 6.2 had a similar enough torque curve to the 454 of the day that they were darn close in tune
diesels run a vacuum pump, and the 400's still run a modulator, usually a black stripe. ( low vacuum)
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Old 05-26-2006, 08:20 AM
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The stock torque converter is not an issue because I am going to get a race converter any way. I am going with a 32-3500 max stall anyway. I just wanted to now things like you mentioned about the governor springs. I am still not sure if I am going to run a full manual valve body yet. Would love to have a trans brake-more money for the trans, rear(snap), drive-shaft(snap). Does it ever end or is it when you start you just cant stop?
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