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Old 12-12-2012, 06:59 AM
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400 small block swap trans torque converter

I have a rebuilt 400 small block. the problem I think I am about to run inti is trying to put this motor on the powerglide trans that I have. I believe the flexplate may b different as well as if the bellhousing will match or if I need to change it. can some help out with some info on this swap and matching to this trans.

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Old 12-12-2012, 09:16 PM
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Originally Posted by savage9scorpio View Post
I have a rebuilt 400 small block. the problem I think I am about to run inti is trying to put this motor on the powerglide trans that I have. I believe the flexplate may b different as well as if the bellhousing will match or if I need to change it. can some help out with some info on this swap and matching to this trans.
The Powerglide will fit the SBC 400 engine you have. The flexplate's torque converter bolt pattern may or may not work w/the Powerglide torque converter, so check it to see. The torque converter has to be for the Powerglide unless the PG has an aftermarket TH350/TH400 spline input installed.
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Old 12-19-2012, 08:35 PM
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thts what the dude I spoke wit @ Jegs mentioned. something along those lines. what does tht mean about the spline shaft and 350. can I have the transmission shop down the building from my job do tht somehow so I could use a normal torque converter. excuse me if I sound weird about the subject but I know extremly little about this part here.
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Old 12-20-2012, 09:46 AM
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Originally Posted by savage9scorpio View Post
thts what the dude I spoke wit @ Jegs mentioned. something along those lines. what does tht mean about the spline shaft and 350. can I have the transmission shop down the building from my job do tht somehow so I could use a normal torque converter. excuse me if I sound weird about the subject but I know extremly little about this part here.
It's doubtful the input shaft has been changed to a TH350 spline, that's not a routine thing to do.

You'll need to look at the input shaft to see if it's a PG or what, but like I said, most likely it's a PG input that will use a PG torque converter. The PG splines are a lot coarser than the TH350 splines- IIRC 17 splines for the PG and 30 for the TH350.

That said, are you sure you want to use a PG in the first place? They're not a good match for a normal-to-heavy vehicle. The torque of the 400 will help some, but they're just not a good tranny for most applications IMO.
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Old 12-20-2012, 10:49 AM
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okay so I found a powerglide tc off cl thts lightly used for $ 75. the only thing is. will this converter with and estimated 2500-2800 stall be enough for the 400? the car is light maybe right around 3300 with me in it. the powerglide has been in the car since I purchased it. and a powerglide is cool with me. when I go 2 the track and run grudge matches I like the consistency of the one gear shift. its a streetcar/highway cruiser tht sees about 40 roundtrip miles back n forth 2 work daily
what happens if there isn't enough stall?
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Old 12-20-2012, 11:04 PM
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Originally Posted by savage9scorpio View Post
okay so I found a powerglide tc off cl thts lightly used for $ 75. the only thing is. will this converter with and estimated 2500-2800 stall be enough for the 400? the car is light maybe right around 3300 with me in it. the powerglide has been in the car since I purchased it. and a powerglide is cool with me. when I go 2 the track and run grudge matches I like the consistency of the one gear shift. its a streetcar/highway cruiser tht sees about 40 roundtrip miles back n forth 2 work daily
what happens if there isn't enough stall?
Well, more torque, more weight, higher gear ratio = more stall from the same converter and vice versa.

In your case bigger engine w/torque = more stall but less weight = less stall. So maybe they'll cancel each other out. lol But there's no way I could say from here if the 25-2800 rpm stall estimate you got will be right without trying it first to see.

BTW, most companies rate their TC behind a mild small block unless otherwise noted. The same tc behind a bigger torquier engine will stall higher.
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Old 12-20-2012, 11:11 PM
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Originally Posted by cobalt327 View Post

BTW, most companies rate their TC behind a mild small block unless otherwise noted. The same tc behind a bigger torquier engine will stall higher.
thanks 4 the heads up on tht.
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Old 12-20-2012, 11:14 PM
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Originally Posted by savage9scorpio View Post
thanks 4 the heads up on tht.
Now obviously that doesn't hold true w/small diameter high stall units. This is for the street TC range, =/> 11" stuff mainly.
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