I've got a TH400 trans that was attached to a 455 Pontiac engine. What can I measure to make sure it's a shortshaft (not longshaft) to fit for my Buick 455 swap? Thx!
If the tailshaft is about 4" its a shorty. If its closer to 9" is a long. These measurements are just off the top of my head, but they should be in the ballpark.
Also, note, there are 2 different yoke diameters for the TH400. 68 and back are larger than the 69-up
For a cruiser and summer driver how can you make a longtail TH400 work in an A-body other than swapping the tailshaft? Isn't the big deal the U-joint angles and the trans tail sitting too high? Couldn't you use a "half height" mount and get that back in check? Thanks,
I had a long tail 400 in a 72 Skylark with a Camaro driveshaft a long time ago.I cant remember if it was a 69 or a 78 Camaro driveshaft, but it was one of them. The trans fit in the tunnel with no problems, stock mount, stock crossmember. This is going back close to 20 years ago.
wonderful, the dude'll probably get his existing driveshaft cut down but we might just get something about the right length out of a yard and then have that cut down. Thanks,
Why does anyone want to re-engineer something that has been done? There is a reason for long and short tail transmissions. You need a short tail in the A-body model to have proper pinion angle. Just ask any of the 4 wheel drive owners who lift their trucks up and go through u-joints every 10-15 tanks of gas. You are creating a problem that already has a solution. Up to you!
BTW ran that long tail in that car for many years, never wore a ujoint, just rear tires. After I took it out of that car I put it in a tubbed 68 Skylark with a BBC and it is still going strong with the same ujoints.
