Driveshaft flange pilot size question

[mechted]

So I got new driveshafts as part of my Magnum install. On the rear shaft, they gave me a 1410 double cardan CV like I wanted, but it has a 3.125" pilot vs the 2" pilot on the flange.

Right now its installed with just the bolts for centering. I'm not convinced this is good enough.
A little research and I think my best option is just to change out the 205's rear flange for one with the bigger pilot. But I want confirmation before I spend money.

Also note: This is a trail rig that does not go over 55 mph. Its scary enough at that speed. Its not registered to go down a public road either.
73 k5 Blazer. 350/th400/magnum/np205. Dana 60 front, 14bff rear. 4.5" lift and 37" tires on H1 double beadlocks.

 

[Hogback Fabrication]

Just bolts will be bad, the pilot is important even at lower speeds.

You could buy the matching flange, or many driveshaft companies make a ring to adapt the two. We've done that many times through Tom Woods.

 

[amelbeach]

You could theoretically use any mechanism to get power from the engine to the rear wheels, but mostly the best solutions are already in place. But here are some of my thoughts in increasing order of stupidity.

You can take the Porsche approach and put the engine in the back. Doesn't really eliminate the driveshaft, but makes it very short.

 

[Stephen]

a 208 flange is 32 spline and has a 3 1/8 pilot. The spacer ring might be the most straight forward solution though. We also have 32 spline flanges with the 3 1/8" pilot.

 

[frankin5]

I think he has a 205 with a 2" pilot. The drive shaft company gave him the 3 1/8 pilot, instead of the 2" he asked for. He should ask the company to redo the shaft or provide him with the proper output flange with a 3 1/8" flange. The picture shows two new shafts with the same 3 1/8" flange.

 

[mechted]

I think he has a 205 with a 2" pilot. The drive shaft company gave him the 3 1/8 pilot, instead of the 2" he asked for. He should ask the company to redo the shaft or provide him with the proper output flange with a 3 1/8" flange. The picture shows two new shafts with the same 3 1/8" flange.

Yep. But decided that I could just change the flange, now have matching front and rear flanges and just sell the 2" pilot one off to whomever. Cheapest route? Nope, but less hassle to solve the problem myself.
Also: Now my front and rear shafts can interchange since they magically came out as the same length.