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#1
05-06-2005, 04:26 PM
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Guys, I'm going to change the TH350 tranny to a TH400. I know that the yoke on the drive shaft will have to be changed, but will the length stay the same ? I've got a TH 400 cross member for the swap. Will the new cross member bolt in the existing holes ? I'm working with a 1969 Firebird. The existing tranny is a short shaft and the new one is a short shaft. What other problems will I run into ?
Jim |
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#2
05-06-2005, 04:26 PM
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Guys, I'm going to change the TH350 tranny to a TH400. I know that the yoke on the drive shaft will have to be changed, but will the length stay the same ? I've got a TH 400 cross member for the swap. Will the new cross member bolt in the existing holes ? I'm working with a 1969 Firebird. The existing tranny is a short shaft and the new one is a short shaft. What other problems will I run into ?
Jim |
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#3
05-06-2005, 06:35 PM
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Hello pontiacjim
I am going through a simular situation looks like I need to have drive shaft cut aprox 1.75" to 2.00" out of the tube section. same year bird but mine was an abortion before i got it(from fact auto. than 4-speed, now th400) |
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#4
05-06-2005, 07:50 PM
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You need to measure your drivetrain to have the driveshaft shortened properly.
Get the car up high enough to crawl under and measure, wood blocks under each tire works well. The car must be on level ground with all of the weight on the suspension. Push the driveshaft yoke all the way into the trans until it bottoms, then pull it out by 7/8". Then measure from the center of the U-joint bearing cups on the tranny yoke and pinion yoke. Take this measurement to the driveshaft shop and have the new shaft made to this dimension. Not all driveshaft yokes are the same length, the same for pinion yokes, plus different rear ends (8.2", 8.5", 12-bolt, etc.) will alter the distance between the bearing cups (driveshaft length). So you really must measure your car to know what you need. The TH400 crossmember will bolt to the existing holes in the subframe. Typically you'll have to shorten the shaft by about 1" when swapping a TH400 for a TH350, but again you should measure to be sure. 
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
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#5
05-07-2005, 07:21 AM
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why? the th350 will hold up quite well....and you`ll just get problems finding the expensive kick down switch...($150-200)...instead of the 350 kick down cable? all that work for what? are you having 600 hp or more?
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FireBjorn http://FirstGenFirebird.org/show/closeup.mv?CarID=221 breathe and enjoy it , life is temporary 69 Firebird convertible 71 Triumph TR6 |
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