Convert T221 transfercase to the 205

[prg machine]

I was wondering if anyone else here has experience with this modification.? The PO on my truck had already did it and used spacers about 1 1/4 inches thick to drop the transfercase because of the difference in output height in the 2 styles of transfercases. It is a K-20 so it has the 2 piece rear driveline with the carrier bearing. I am assuming this was the reason for the drop.

[prg machine]

ttt

[ND_guy]

Try posting this in the 4x4 section you will have better luck.

Your post isn't very clear about what information your looking for. If you need a measurement of d-shafts, or distance below framerails, I can help my 67 k20 has been converted to a sm465 with a 205t/c. I can get you some measurments if you want.

Nick

[Yukon Jack]

I know the transfer case crossmember used with the Dana 20 transfer case and the NP205 transfer case are different. When I put an NP205 in place of the Dana 20 that was in my K5 I had to use spacers to drop the Dana 20's crossmember, otherwise the top of the NP205 transfer case hit the bottom of the floor.

I guessing that might be what occurs with the NP205 and T221 transfer cases.

You can see the 1" spacer I used under the crossmember and there is also a set inside for the upper frame mount.

[prg machine]

To put it simply, the 221 was a dropped output that ran off a different shaft than the direct output inline with the trans output. Approximately 3 inches lower I believe. That is what requires the lowering blocks.