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Old Aug 7, 2011 | 02:26 PM
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Default th400?
i have a 2000 firebird with a th350 in it i just pick up a th400 what do i need to swap it? thanks joe
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Old Aug 8, 2011 | 06:30 AM
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anyone need to start getting some stuff together
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Old Aug 8, 2011 | 06:54 AM
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Shouldn't need anything since a th350 is in it.
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Old Aug 8, 2011 | 08:42 AM
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Originally Posted by SuperSlow02
Shouldn't need anything since a th350 is in it.
crossmember and drive shaft are the same?
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Old Aug 9, 2011 | 03:00 PM
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I'd think they are but, better off measuring the length of the transmissions. Some come short and some are long.
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Old Aug 9, 2011 | 03:03 PM
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As for the crossmember you can check BMR suspension and just look at the conversion crossmembers. I think they are the same too
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Old Aug 9, 2011 | 05:49 PM
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You'll need a new drive shaft yoke (they are not the same), cross member, tranny mount, and a kickdown wiring harness since the kickdown is electronic instead of cable-actuated. That's about it I think.
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Old Aug 9, 2011 | 06:29 PM
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You will need:

Crossmember, as they are different.

Driveshaft, may be a different length, I haven't done this swap so I'm not 100% on that

If you have a rmvb, you may need a different shifter.. if it's a std valvebody, you're good.

There is no "kickdown" crap needed at all if it's got a manual valve body.. which I couldn't imagine it not to have a manual one.
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Old Aug 10, 2011 | 07:14 AM
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Originally Posted by JL ws-6
You will need:

Crossmember, as they are different.

Driveshaft, may be a different length, I haven't done this swap so I'm not 100% on that

If you have a rmvb, you may need a different shifter.. if it's a std valvebody, you're good.

There is no "kickdown" crap needed at all if it's got a manual valve body.. which I couldn't imagine it not to have a manual one.
the th350 in it now has rmvb already so the shifter should work
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Old Aug 10, 2011 | 09:29 AM
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Correct, if the th400 has the same type of valve body, then it's just the crossmember, and driveshaft that should be needed.
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Old Aug 10, 2011 | 10:08 AM
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Originally Posted by JL ws-6
Correct, if the th400 has the same type of valve body, then it's just the crossmember, and driveshaft that should be needed.
thanks jl
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Old Aug 10, 2011 | 10:19 AM
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Yes cross-member is correct, how are you mounting your torque arm now with the TH350?
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Old Aug 14, 2011 | 07:25 AM
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Originally Posted by UMI Performance
Yes cross-member is correct, how are you mounting your torque arm now with the TH350?
tunnel mount
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