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Old 02-21-2011, 09:48 PM
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replacing T-350 with T-400

i have a 75 firebird with a 400 pontiac and a th350 both motor and tranny are shot i just bought a running 400 pontiac that has a th400 hooked up to it that came out of a 79 firebird both are working. i would think since it was in one firebird then it should fit the other. will i have to change the yoke, can i still use the same drive shaft and the 350 has a kick down cable the 400 doesnt? i understand it has an electric down shift how does that get hooked up does it have to cant you just down shift it yourself. replacing the 350 with another 350 sounds easier but i have the working 400 already and times are tough dont have money to spend on another tranny if this 400 could hook up with little effort. thanks for any help i can get

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Old 02-22-2011, 12:56 AM
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Cross members are different; drive shaft will need replacing or shortening; TH400 uses a much larger slip yoke; TH400 uses an electric/switch actuated kickdown (carburetor or internal side of the firewall mounted); the shifter should be the same, save for where the cable and bracket mounts to the trans pan; cooler lines are the same; and I think that's about all.
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Old 02-22-2011, 08:39 PM
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350 to 400 swap

well thanks for the help sounds like it would be easier to just get a th350 rather than find a yoke, driveshaft, deal with the electric kickdown, crossmember. and for what is the th400 a better trans would it be worth all the trouble I'm not convinced it would be worth it.
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