Swapping T221 for a NP205 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67gmcstepside · 11-15-2011, 05:28 PM

Guys,
I have searched and read every post on replacing 221's and I dont understand why so many modificaitons would be required if the 205 came in trucks from 69 to 72. Almost everything else is interchangable so why would you need to reposistion carrier bearing's, relocation cross members 2inch's back etc. I read YukonJacks thread and its seem like a lot of work to replace in a 67/68 something that came in a 69-72. I am replacing what turned out to be a bad sm465 and am trying to decide to dump the 221 for a 205 that I have.

BurnoutNova · 11-15-2011, 05:43 PM

The reason you need to do all of that is because they are different. The cross member is in a different spot, and will not bolt up without moving it.

MyDad'sTruck · 11-15-2011, 05:50 PM

I talked to a shop in town that said the same as BurnoutNova on this issue.

67gmcstepside · 11-15-2011, 06:40 PM

Ok, thanks guys, I just have to decide if it's worth changing out the 221 for a 205 when I change the trans.
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odog · 11-15-2011, 10:27 PM

just my opinion, but put the tcase on the tranny that fits without buying an adapter. Both the 221 and 205 are good, I am swapping a 205 onto a 465 only because my 221 finally wore out after 44 years. If the 221 is in good shape and mounts to the 465 use it.

67gmcstepside · 11-16-2011, 06:38 AM

I have both right now, a 205 with the 465 adapter and the 221 that's in the truck now. I am leaning with just reinstalling the 221 after I get the 465 rebuilt, thank for your input!
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**Yukon Jack** · 11-16-2011, 06:25 PM

One of the biggest issue is that the rear output is placed in a totally different height position on the T221 compared to the NP205 so without changing the placement of the carrier bearing the rear driveshaft won't be in the right position. There are some trucks that don't use the two piece rear driveshaft and therefore won't have the carrier bearing issue.

67gmcstepside · 11-16-2011, 08:03 PM

Since the 205 came in 69 -72 a donor truck would have all the right parts. I see a pretty beat up 4x4 which i think is a 70 for sale close to my house. If i use its cross member, drive shafts and carrier i should be able to bolt it in other then repositioning the cross member. Still not decide which direction to head. I have time since I have not even started the disassembly yet.

67gmcstepside · 11-20-2011, 06:43 PM

Well my donor truck turned out to be 68 with a Rockwell. I think I am going with the 205. So i I need a 69-72 transfer case cross member and since I assume most had a 2 piece drv shaft the carrier bearing mount as well. I will worry about the drive shafts later. Need to post in for sale WTB these parts. Since I just squeezed the truck into my garage I will have time as I need to remove the transfer case, Adapter and trans. Not looking forward to any of this.
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Vintage Windmills · 11-22-2011, 08:11 PM

For all the hassle of swapping you could probably just rebuild your t221 and get another 40 years of great service. Parts may be a little tougher to find but I know you can get all bearings and seals.

1969K10 · 11-22-2011, 09:01 PM

Quote:

Originally Posted by Vintage Windmills

For all the hassle of swapping you could probably just rebuild your t221 and get another 40 years of great service. Parts may be a little tougher to find but I know you can get all bearings and seals.

If you need to replace input or output shafts, this becomes a non cost effictive thing.

Vintage Windmills · 11-22-2011, 09:18 PM

Quote:

Originally Posted by 1969K10

If you need to replace input or output shafts, this becomes a non cost effictive thing.

Makes sense if its that bad. I suppose if thats the case the best bet is to find a complete parts unit.

67gmcstepside · 11-24-2011, 07:54 AM

The 221 seemed to be in working condition other then a few small leaks. Plus I do have a second one but decided to go with the 205. Maybe someone local to nj can use it. I will have to post it once it get the truck back together. Right now i am battling with getting the trans out.
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11-15-2011, 05:28 PM	#1
67gmcstepside Registered User Join Date: Jan 2010 Location: jackson Posts: 676	Swapping T221 for a NP205 Guys, I have searched and read every post on replacing 221's and I dont understand why so many modificaitons would be required if the 205 came in trucks from 69 to 72. Almost everything else is interchangable so why would you need to reposistion carrier bearing's, relocation cross members 2inch's back etc. I read YukonJacks thread and its seem like a lot of work to replace in a 67/68 something that came in a 69-72. I am replacing what turned out to be a bad sm465 and am trying to decide to dump the 221 for a 205 that I have.

11-15-2011, 05:43 PM	#2
BurnoutNova Registered User Join Date: Mar 2004 Location: CA Posts: 2,057	Re: Swapping T221 for a NP205 The reason you need to do all of that is because they are different. The cross member is in a different spot, and will not bolt up without moving it.

11-15-2011, 05:50 PM	#3
MyDad'sTruck Registered User Join Date: Mar 2010 Location: Minneapolis Minnesota Posts: 70	Re: Swapping T221 for a NP205 I talked to a shop in town that said the same as BurnoutNova on this issue.

11-15-2011, 06:40 PM	#4
67gmcstepside Registered User Join Date: Jan 2010 Location: jackson Posts: 676	Re: Swapping T221 for a NP205 Ok, thanks guys, I just have to decide if it's worth changing out the 221 for a 205 when I change the trans. Posted via Mobile Device

11-15-2011, 10:27 PM	#5
odog Registered User Join Date: Oct 2007 Location: Wendell, Idaho Posts: 608	Re: Swapping T221 for a NP205 just my opinion, but put the tcase on the tranny that fits without buying an adapter. Both the 221 and 205 are good, I am swapping a 205 onto a 465 only because my 221 finally wore out after 44 years. If the 221 is in good shape and mounts to the 465 use it. __________________ 1969 4x4 Nothing beats a good rock drill and some dynamite

11-16-2011, 06:38 AM	#6
67gmcstepside Registered User Join Date: Jan 2010 Location: jackson Posts: 676	Re: Swapping T221 for a NP205 I have both right now, a 205 with the 465 adapter and the 221 that's in the truck now. I am leaning with just reinstalling the 221 after I get the 465 rebuilt, thank for your input! Posted via Mobile Device

11-16-2011, 06:25 PM	#7
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Re: Swapping T221 for a NP205 One of the biggest issue is that the rear output is placed in a totally different height position on the T221 compared to the NP205 so without changing the placement of the carrier bearing the rear driveshaft won't be in the right position. There are some trucks that don't use the two piece rear driveshaft and therefore won't have the carrier bearing issue. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

11-16-2011, 08:03 PM	#8
67gmcstepside Registered User Join Date: Jan 2010 Location: jackson Posts: 676	Re: Swapping T221 for a NP205 Since the 205 came in 69 -72 a donor truck would have all the right parts. I see a pretty beat up 4x4 which i think is a 70 for sale close to my house. If i use its cross member, drive shafts and carrier i should be able to bolt it in other then repositioning the cross member. Still not decide which direction to head. I have time since I have not even started the disassembly yet. Last edited by 67gmcstepside; 11-17-2011 at 09:40 AM.

11-20-2011, 06:43 PM	#9
67gmcstepside Registered User Join Date: Jan 2010 Location: jackson Posts: 676	Re: Swapping T221 for a NP205 Well my donor truck turned out to be 68 with a Rockwell. I think I am going with the 205. So i I need a 69-72 transfer case cross member and since I assume most had a 2 piece drv shaft the carrier bearing mount as well. I will worry about the drive shafts later. Need to post in for sale WTB these parts. Since I just squeezed the truck into my garage I will have time as I need to remove the transfer case, Adapter and trans. Not looking forward to any of this. Posted via Mobile Device Last edited by 67gmcstepside; 11-20-2011 at 06:54 PM.

11-22-2011, 08:11 PM	#10
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: Swapping T221 for a NP205 For all the hassle of swapping you could probably just rebuild your t221 and get another 40 years of great service. Parts may be a little tougher to find but I know you can get all bearings and seals. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

11-24-2011, 07:54 AM	#13
67gmcstepside Registered User Join Date: Jan 2010 Location: jackson Posts: 676	Re: Swapping T221 for a NP205 The 221 seemed to be in working condition other then a few small leaks. Plus I do have a second one but decided to go with the 205. Maybe someone local to nj can use it. I will have to post it once it get the truck back together. Right now i am battling with getting the trans out. Posted via Mobile Device



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