T400 Output Shaft Yoke

I need to order a new driveshaft. My question is the yoke that connects to the T400 tranny. I understand there are 2 types of yokes. A slip-on yoke or a bolt on yoke for trucks that has a O-Ring seal on the tranny output shaft. I do not know where my T400 came from so can someone look at these pictures and let me know what you think? I am thinking a T400 slip on yoke, not threaded. I called tech support, but the guy was getting frustrated with my lack of knowledge about my T400.
 

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The Chevy and GMC 3/4 Ton and 1 Ton Trucks with the Turbo 400 2wd used a bolt on Yoke.
The Main output shaft is just a hair shorter than the Passenger Musclecar Turbo 400 Short output shaft used 1965-1974 in Chevy, Pontiac, Oldsmobile, and Buick.
Turbo 400 passenger car application last used in the 1976 Corvette, 1976 Pontiac Grand Prix 400 & 455 engines & 1977 Buick Electra 225 with the Olds 403 V8 with Turbo 400 Transmission.

Remove the Chevy bolt on yoke to the Turbo 400. It will work in all standard short shaft Turbo 400 applications.

The Factory Mechanics 3R Turbo 400 slip yokes are very hard to find today.
Quite strong will take up to 700 Hp max.
550-600 Hp True is a good idea to upgrade to 1 size larger U-joints 1350 Dana Spicer.
Going to spend money to upgrade Right for 1000-2000 Hp 1350 Billet 4140 Chromemoly Slip Yoke, Rear Differential companion flange 4140, Might as well get the best Chromemoly 4130 Driveshaft made it's by Mark Williams Racing.
Going to spend $1200-1500 cash.

The 1971-1974 Firebird Trans Am Had the shortest and Strongest Turbo 400 3R Mechanics Driveshaft slip Yoke what I use on my 1963 Pontiac Gp.
From a 1973 Trans Am 455 Turbo 400 car.
 
The Strongest Factory Driveshafts were used in The Top Dog Musclecars .
GM Assigned special part numbers to them, paint coded from the Factory to identify.
1970- 1976 Pontiac Fullsize with 455 and Turbo 400 got a massive 3-1/2" OD Diveshaft thickwall, Tapered down on the ends all 1-piece .
Super Strong what I use 1970 Bonneville 455 Turbo 400 driveshaft.

Aftermarket mild steel driveshafts are affordable.
Supposed to use only to 500 Hp max though I see guys here in Illinois pushing to 1000+ Hp boosted, very risky.
 
pictures of th400 transmission , drive shaft yokes

bolt on
s-l500.jpg


https://www.ss396.com/chevelle/FY-1...prTvYq2fcdwAUXf_LsIIo1wdU4LW352RoCDyIQAvD_BwE
more common direct to universal joint style

FY-123c.jpg


http://garage.grumpysperformance.co...asuring-for-a-new-drive-shaft.478/#post-67321

http://garage.grumpysperformance.com/index.php?threads/trans-slip-yoke-problem.8765/#post-53682

https://www.dennysdriveshaft.com/c976_combination_universal_joints.html
 
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