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Old 02-03-2013, 08:30 AM
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trany to trany?

hey everyone! Hope to get some help? the transmission on my 1980 pontiac grand prix just bought the farm. it's a v6 3.8 block so i believe the trany is a th200. I have a trany from a 1978 grand prix, that was on a pontiac 301 v8. So i believe it's a th350. does any one know if it will bolt in my 1980 on the v6?...Dan

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Old 02-03-2013, 08:51 AM
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If the trans is actually a 200th. Some were overdrive 200 4r trans. They will bolt together.
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Old 02-03-2013, 08:58 AM
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Trans

I believe that it will bolt right up. Just make sure the tailshaft is the same length and that you use the correct convertor for your engine.
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Old 02-03-2013, 09:50 AM
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First of all, the 200-4R wasn't factory installed in the G-body cars until the 1983 model year and in fact, the frame rails don't even have the provision to install the 200-4R crossmember (which is different). You have to use an aftermarket adapter plate to do it. The trans is a TH200.

The TH200, TH250, and TH350 are all externally identical in length, mounting, and yoke size, so yes, this is a bolt-in. The TH200 is a throttle valve trans, the TH350 uses a vacuum modulator and kickdown cable. The kickdown cable may or may not attach in the same way as the TV cable on the TH200, and of course you'll need to run a vacuum line to the modulator. The TH350 may be a TH350C with lockup or it may be a regular TH350.
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Old 02-03-2013, 10:08 AM
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trans

Oh yeah, I didn't even think about the vacuum modulator and TV cable. But that is a fairly simple task to correct
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Old 02-03-2013, 01:20 PM
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both should be 200 trans make sure you clean out the cooler lines
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