T221 to NP205 swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Durney · 07-21-2003, 08:59 AM

Just picked up another 67 3/4 ton and looking to swap the T221 transfer for the NP205. (as well as a 14bolt) Can anyone tell me exactly whats involved and the parts needed? I wish the search was working because I know this has been covered MANY times.

I assume the crossmember will be the NP205 version from a 69-72? What about shifter location? Driveshaft longer from the increased angle? Speedo hookup? SM420 issues?

Thanks in advance!

breeh · 07-21-2003, 12:19 PM

The crossmember is the same for the 221 and the 205 so you don't need to change that. The hole for the shifter will be in a different location. I just bought a new hump with the appropriate hole in it. I used my same speedo cable as well. As far as the driveshaft is concerned, I am not sure in your case. I moved everything forward to accomadate the big block so I had to redo the driveline. Make sure that you get the adapter that goes with the 205 because your existing 221 adapter is different.

Durney · 07-21-2003, 12:28 PM

Thanks Breeh ... which adapter for the SM420 fits the NP205? Is it the same as the SM465?

Blazer1970 · 07-21-2003, 12:53 PM

There is no adapter to marry an NP205 to a SM420. Your best bet would be to find a 465/205 combo with the adapter to swap in.

1969 GMC · 07-22-2003, 01:48 AM

unless there is something wrong with the 221, I would just leave it in there. if its broken, a 205 is probably cheaper than the parts.

07-21-2003, 08:59 AM	#1
Durney Registered User Join Date: Jul 2002 Location: Michigan Posts: 158	T221 to NP205 swap Just picked up another 67 3/4 ton and looking to swap the T221 transfer for the NP205. (as well as a 14bolt) Can anyone tell me exactly whats involved and the parts needed? I wish the search was working because I know this has been covered MANY times. I assume the crossmember will be the NP205 version from a 69-72? What about shifter location? Driveshaft longer from the increased angle? Speedo hookup? SM420 issues? Thanks in advance!

07-21-2003, 12:19 PM	#2
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	The crossmember is the same for the 221 and the 205 so you don't need to change that. The hole for the shifter will be in a different location. I just bought a new hump with the appropriate hole in it. I used my same speedo cable as well. As far as the driveshaft is concerned, I am not sure in your case. I moved everything forward to accomadate the big block so I had to redo the driveline. Make sure that you get the adapter that goes with the 205 because your existing 221 adapter is different. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

07-21-2003, 12:53 PM	#4
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	There is no adapter to marry an NP205 to a SM420. Your best bet would be to find a 465/205 combo with the adapter to swap in. __________________ Tim

07-22-2003, 01:48 AM	#5
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	unless there is something wrong with the 221, I would just leave it in there. if its broken, a 205 is probably cheaper than the parts. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

07-21-2003, 12:28 PM	#3
Durney Registered User Join Date: Jul 2002 Location: Michigan Posts: 158	Thanks Breeh ... which adapter for the SM420 fits the NP205? Is it the same as the SM465?



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