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Does anyone know the c-c length of the shaft for th 350 .
I have one for the th400 and that one is 1225 mm ( should be 48,22” )
I´m going to replace the th400 with a Th 2004R ( or Th200R4 ) and as I understand the shaft for th350 will fit!
Thanks
Tommy Firebird 68 conv 350 HO Cougar 70 conv 351 Cl 4V It’s only dead fishes swimming with the stream!  
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Tommy,
The difference in length between the two automatic drives shafts, 350 and 400, is .66".
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Sorry Jim. I dont get it! .66."
Do you men that it´s 6,6" that will be ..167,64mm
Tommy
Tommy Firebird 68 conv 350 HO Cougar 70 conv 351 Cl 4V It’s only dead fishes swimming with the stream!
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I think he means 0.66 inches. I don't know what that translates to in metric terms, probably around 1.5 centimeters?
Bruce
'67 Firebird Convertible
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The 0.66 inches seems kind of low. I'd call or email a trans tech line like TCI or something.
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Jim's answer is 0.66 inches. There are 25.4 mm per inch. This means 16.764 mm.
John 
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That answer, .66 inches, came straight out of the factory specifications. It wasn't a guess. Go to the AMA on this site and you will see it. Hint; They call it a propeller shaft. 
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My suggestion, regardless of what has been documented as correct, is to measure for the driveshaft once you are ready for it. Sit the car on the ground so the suspension is settled. Place the trans slip yoke in the tail all the way, then bring it back .75 <make that 3/4 inch>. then measure c-c to the pinion yoke. That should be dead on. Know what u-joint series you are dealing with, but keep in mind there are conversion joints to help you get where you need to be should there be a difference.
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Greg is right, of course. But here's a reliable source too; I have a 2004-r. You can get an adapter for the 700r4. The 200 does not require a driveshaft change if going from a th350 or st300 2spd. The 700 has slightly lower gearing and more available 'user friendly' mods. I like the higher 4th of the 200 and the fact i didn't have to get a new driveshaft or adapter plate. i wish my speedo gears were as easy to change and I had more choices in governor mods like the 700.
Both require crossmember mods. Don't assume the new crossmember will fit perfect to your pontiac with either trans. Maybe it will. Mine didn't.
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st300, th350, and 4 spd m/t shaft's are the same length, use the same yokes, and should work.
There are 3 different th400 tail shaft lengths, and the trans yoke is bigger.
Short for F bodies.
Medium for A bodies(only seen a few).
Long for B bodies.
Unless you can find a good ready to go 350 shaft, i would do what Greg suggested.
Most places will make a new shaft for about $125-$175.
At least thats what it cost me.
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Well
Thanks. A lot.
One question and one day later there’s a whole tread with support and help. I must say it´s fantastic . Thanks
The season is just over and the winter closing in. I think I try to get my hands on a 350 “propeller shaft” just to se how things line up. Its for my wife’s shopping car so I hope the GM 200 4R will stay in one piece!
The reason a asked was that I got a Buick estate wagon shaft that came along with the tranny and I was thinking of just doing a copy, if I know the exact length on a Th350/4 sp shaft
Tommy Firebird 68 conv 350 HO Cougar 70 conv 351 Cl 4V It’s only dead fishes swimming with the stream!
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Good luck with the project. I did it a while back and have NEVER looked back. You DO need to be careful to have your detent cable adjusted proper.
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The reason a asked was that I got a Buick estate wagon shaft that came along with the tranny and I was thinking of just doing a copy, if I know the exact length on a Th350/4 sp shaft
Tommy, Go to the page at the link below and click on propeller shaft for the exact lengths; https://firstgenfirebird.org/firebird/1969/ama/ama_index.html
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The reason a asked was that I got a Buick estate wagon shaft that came along with the tranny and I was thinking of just doing a copy, if I know the exact length on a Th350/4 sp shaft
Tommy, Go to the page at the link below and click on propeller shaft for the exact lengths; https://firstgenfirebird.org/firebird/1969/ama/ama_index.html Won't the propeller shaft length depend no whether he is using an inboard or outboard motor? Does it have to be coastguard approved? 
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Okey
Now I got.
49,96 and 49,30 Thats 0,66
Thank you
I´ll get back to you as soon as the get the tranny
I must study the posts with GM 200R4 more carefully
Tommy Firebird 68 conv 350 HO Cougar 70 conv 351 Cl 4V It’s only dead fishes swimming with the stream!
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High Perf Pont did a series of articles quite a while back that
touched on most everything. It left out a few details, but they would be more vehicle specific anyway. Pontiac Enthusiast is doing a swap to a 700 from a bowtie overdrive packaged kit.
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