np205 outputs questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JIMs70GMC** · 02-08-2015, 09:51 PM

I have a 71 and 84 np205s. Are the rear output splines the same between the two? For the front the 71 has a yoke the 84 has a flange, are they interchangeable? I have a 71 front driveshaft and an 86 front driveshaft that will need to be shortened to work with the flange. Thanks

Jim

obijuan · 02-09-2015, 06:50 PM

rear are all 32 spline.
front on the 71 is probably 10 spline. front on the 84 is 30 spline. entire front output shafts interchange if necessary.

**JIMs70GMC** · 02-10-2015, 08:57 AM

Thanks, I will need to pull the yoke off the 71 (1/2 ton) and put on the 84 (3/4 ton). I am using a 1/2 ton driveshaft and do not want to find a hybrid joint for the rear.

Jim

franken · 02-10-2015, 10:24 PM

Are the front shaft spline counts the same? Maybe you can mix and match. Might lead to a balance problem, but the front isn't spinning at high speed if you have locking hubs.
Maybe a crazy idea...

**CUSTOM/10** · 02-11-2015, 08:25 AM

As obijuan said, the spline counts are different so you would have to swap out the front out-put shaft in order to swap the yokes. I have done this to a few np205's but in reverse, I like the flange better than the yoke style.

And it's best to do the swap with the T/C's on a bench, I have done this in the truck but it's VERY difficult !!!!!
Gary

**JIMs70GMC** · 02-11-2015, 02:09 PM

The front is fine. I am having the front driveshaft shorten. The rear is what I need to swap, I have a 1/2 ton yoke and a 3/4 ton yoke, the driveshaft is 1/2 ton. I want to pull the big yoke off and put the 1/2 ton yoke on.

**CUSTOM/10** · 02-11-2015, 02:31 PM

OK, I thought you were talking about the front. I believe the rear has the same spline count. If not you could swap out the whole out put assembly.

I did that with a later model np205 from a blazer, they came with a slip-joint.

Gary

**JIMs70GMC** · 02-11-2015, 09:48 PM

cool, going to swap yokes this weekend then.

franken · 02-11-2015, 09:48 PM

Actually I was speaking of the front driveshaft splines, not the output of the TC.

**JIMs70GMC** · 02-14-2015, 07:12 PM

All swapped. Thanks

**JIMs70GMC** · 02-16-2015, 11:32 AM

Well, looks like I'm going to put the 1350 yoke back on since I found the hybrid joint to use. Oh well, thanks for the input I was glad to see things were kept the same over 15 years.

02-08-2015, 09:51 PM	#1
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	np205 outputs questions I have a 71 and 84 np205s. Are the rear output splines the same between the two? For the front the 71 has a yoke the 84 has a flange, are they interchangeable? I have a 71 front driveshaft and an 86 front driveshaft that will need to be shortened to work with the flange. Thanks Jim __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

02-09-2015, 06:50 PM	#2
obijuan Registered User Join Date: Jun 2012 Location: cibolo tx Posts: 1,033	Re: np205 outputs questions rear are all 32 spline. front on the 71 is probably 10 spline. front on the 84 is 30 spline. entire front output shafts interchange if necessary.

02-10-2015, 08:57 AM	#3
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: np205 outputs questions Thanks, I will need to pull the yoke off the 71 (1/2 ton) and put on the 84 (3/4 ton). I am using a 1/2 ton driveshaft and do not want to find a hybrid joint for the rear. Jim __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

02-10-2015, 10:24 PM	#4
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,052	Re: np205 outputs questions Are the front shaft spline counts the same? Maybe you can mix and match. Might lead to a balance problem, but the front isn't spinning at high speed if you have locking hubs. Maybe a crazy idea...

02-11-2015, 08:25 AM	#5
CUSTOM/10 Senior Member Join Date: May 2003 Location: Sandown, NH Posts: 2,796	Re: np205 outputs questions As obijuan said, the spline counts are different so you would have to swap out the front out-put shaft in order to swap the yokes. I have done this to a few np205's but in reverse, I like the flange better than the yoke style. And it's best to do the swap with the T/C's on a bench, I have done this in the truck but it's VERY difficult !!!!! Gary __________________ Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 Last edited by CUSTOM/10; 02-11-2015 at 10:23 AM.

02-11-2015, 02:09 PM	#6
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: np205 outputs questions The front is fine. I am having the front driveshaft shorten. The rear is what I need to swap, I have a 1/2 ton yoke and a 3/4 ton yoke, the driveshaft is 1/2 ton. I want to pull the big yoke off and put the 1/2 ton yoke on. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

02-11-2015, 02:31 PM	#7
CUSTOM/10 Senior Member Join Date: May 2003 Location: Sandown, NH Posts: 2,796	Re: np205 outputs questions OK, I thought you were talking about the front. I believe the rear has the same spline count. If not you could swap out the whole out put assembly. I did that with a later model np205 from a blazer, they came with a slip-joint. Gary __________________ Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859

02-11-2015, 09:48 PM	#8
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: np205 outputs questions cool, going to swap yokes this weekend then. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

02-11-2015, 09:48 PM	#9
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,052	Re: np205 outputs questions Actually I was speaking of the front driveshaft splines, not the output of the TC.

02-14-2015, 07:12 PM	#10
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: np205 outputs questions All swapped. Thanks __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

02-16-2015, 11:32 AM	#11
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: np205 outputs questions Well, looks like I'm going to put the 1350 yoke back on since I found the hybrid joint to use. Oh well, thanks for the input I was glad to see things were kept the same over 15 years. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm



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