86 TH-400/NP205 Set Up, Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JimKshortstep4x4 · 12-18-2002, 08:14 AM

I am looking at possibly buying a TH-400/NP205 setup out of a one ton 4x4. It is an 86 Chevrolet truck and I want to know if the setup is the same as the 69-72 transmission/transfer case combo.

Any opinions on the setup good or bad?

Jim

Blazer1970 · 12-18-2002, 08:28 AM

That is the strongest automatic and t-case combo that GM ever made until the new Allison. If you can pick it up at a decent price, do not hesitate. All of the automatic transmissions used with NP205s in 4WD trucks in the '67 - '72 era were TH350s.

JimKshortstep4x4 · 12-18-2002, 09:07 AM

Tim,

Thanks for the reply.

Do you know if the np205 is the same?

Jim

Blazer1970 · 12-18-2002, 09:52 AM

The NP205 that is used with a TH400 has a 32 spline female input. The version that is used with a TH350 has a 27 spline male input shaft. The 32 spline female input shaft uses a bearing that has a larger OD than the other versions (TH350 and the 10 spline male input that is used with the SM465), so the case has a larger bore to accommodate this input shaft. The adapter between the transmission and the t-case is also different for the TH400 vs. the TH350.

JimKshortstep4x4 · 12-18-2002, 10:02 AM

Tim,

Thanks for the information! You have been a lot of help.

Jim

694X4 · 12-18-2002, 10:21 AM

NAW its no good, if you send it down here to Ohio I will dispose of it for you

Just kidding. Yeah I would go for it it is about the best set up you can get. I would have to see the allison and what ever transfercase used with it last for 20-30 years before I would compare. Those 205s are almost bullet proof. Anyone know what a seperate hung 205 goes for I just picked one up last night for $200. Now I just have to figure out what I am going to do with it.

JimKshortstep4x4 · 12-18-2002, 10:47 AM

Until Blazer 70 pointed it out, I never realized that the TH400 setup did not come in any of the 67-72 trucks. We have (5) of the
71-72 4x4 trucks and one has the 400 transmisssion 205 combo and the rest are TH 350 with the Np 205. Now we know that the 400 did not come in the 72 that has one. We always wondered why the side mount on the NP 205 would not bolt up to any of the hole patterns in the frame.

Thanks for the disposition offer 694x4! We will probably hang on to the tranny.

If we run accross another one, do you want to know about it?

Jim

694X4 · 12-18-2002, 11:16 AM

Well I had to try

Yeah sure if you come across one let me know. i realy don't have a use for it right now but I am always in the mood to buy parts especialy when they are tough parts.

JimKshortstep4x4 · 12-18-2002, 12:11 PM

69 4x4,

It never hurts to try!

If I run into a setup like this , I will let you know.

Jim

6869704X4 · 12-19-2002, 04:14 PM

Its what I plan on running behind my Cad 500.

neonlarry · 12-23-2002, 10:27 PM

the adapter for the th400 to np 205 is really, really hard to find, so yea, it's worth it. If you find more, buy them and sell them on e-bay or something. lol (you could send me one too...

)

**Richard** · 12-24-2002, 02:28 AM

Last time I checked that adapter is still available new from GM, not an inexpensive piece though. 4X Heaven has a better price. Used setups can be a bit scarce but they are around. I do know that the 350/205 splined adapter sleeve is not available new from GM. Lastly here is a short thread relating to this combo. http://67-72chevytrucks.com/vboard/s...threadid=33702

OLDCHEV4X4 · 12-28-2002, 02:55 PM

The splined sleeve is available from GM , but only the 70 and up sleeve. The 69 sleeve is NLA. You can convert to the newer sleeve.
It is cheaper to go to 4xheaven (800-800-1679) for the sleeve. $70 from them and around $140 from GM.
Randy

keenee · 12-31-2002, 09:19 AM

First- The 400/205 is the strongest auto setup out there

Second- It will fit a 67-72 with mods to the location of the trans crossmember (easy, slide it back and drill new holes) and mods to the driveshafts (front gets longer, rear gets shorter). I would get the driveshafts from the 1 ton along with the tranny/t-case, take all the shafts to your local driveline guy with some measurements and he will make you just what you need

12-18-2002, 08:14 AM	#1
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	86 TH-400/NP205 Set Up, Question I am looking at possibly buying a TH-400/NP205 setup out of a one ton 4x4. It is an 86 Chevrolet truck and I want to know if the setup is the same as the 69-72 transmission/transfer case combo. Any opinions on the setup good or bad? Jim

12-18-2002, 08:28 AM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	That is the strongest automatic and t-case combo that GM ever made until the new Allison. If you can pick it up at a decent price, do not hesitate. All of the automatic transmissions used with NP205s in 4WD trucks in the '67 - '72 era were TH350s. __________________ Tim

12-18-2002, 09:52 AM	#4
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	The NP205 that is used with a TH400 has a 32 spline female input. The version that is used with a TH350 has a 27 spline male input shaft. The 32 spline female input shaft uses a bearing that has a larger OD than the other versions (TH350 and the 10 spline male input that is used with the SM465), so the case has a larger bore to accommodate this input shaft. The adapter between the transmission and the t-case is also different for the TH400 vs. the TH350. __________________ Tim

12-18-2002, 10:21 AM	#6
694X4 Registered User Join Date: Jul 2001 Location: utica, oh, Posts: 249	NAW its no good, if you send it down here to Ohio I will dispose of it for you Just kidding. Yeah I would go for it it is about the best set up you can get. I would have to see the allison and what ever transfercase used with it last for 20-30 years before I would compare. Those 205s are almost bullet proof. Anyone know what a seperate hung 205 goes for I just picked one up last night for $200. Now I just have to figure out what I am going to do with it. __________________ 69 3/4 ton 4x4 gmc with 6" sky jacker soft ride. 350 / th350 / 205 work in progress

12-18-2002, 11:16 AM	#8
694X4 Registered User Join Date: Jul 2001 Location: utica, oh, Posts: 249	Well I had to try Yeah sure if you come across one let me know. i realy don't have a use for it right now but I am always in the mood to buy parts especialy when they are tough parts. __________________ 69 3/4 ton 4x4 gmc with 6" sky jacker soft ride. 350 / th350 / 205 work in progress

12-18-2002, 09:07 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Tim, Thanks for the reply. Do you know if the np205 is the same? Jim

12-18-2002, 10:02 AM	#5
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Tim, Thanks for the information! You have been a lot of help. Jim

12-18-2002, 10:47 AM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Until Blazer 70 pointed it out, I never realized that the TH400 setup did not come in any of the 67-72 trucks. We have (5) of the 71-72 4x4 trucks and one has the 400 transmisssion 205 combo and the rest are TH 350 with the Np 205. Now we know that the 400 did not come in the 72 that has one. We always wondered why the side mount on the NP 205 would not bolt up to any of the hole patterns in the frame. Thanks for the disposition offer 694x4! We will probably hang on to the tranny. If we run accross another one, do you want to know about it? Jim

12-18-2002, 12:11 PM	#9
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	69 4x4, It never hurts to try! If I run into a setup like this , I will let you know. Jim

12-19-2002, 04:14 PM	#10
6869704X4 Registered User Join Date: Jul 2002 Location: SE NM Posts: 769	Its what I plan on running behind my Cad 500. __________________ The more I learn about women, the more I love my truck.

12-23-2002, 10:27 PM	#11
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	the adapter for the th400 to np 205 is really, really hard to find, so yea, it's worth it. If you find more, buy them and sell them on e-bay or something. lol (you could send me one too... ) __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

12-24-2002, 02:28 AM	#12
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,698	Last time I checked that adapter is still available new from GM, not an inexpensive piece though. 4X Heaven has a better price. Used setups can be a bit scarce but they are around. I do know that the 350/205 splined adapter sleeve is not available new from GM. Lastly here is a short thread relating to this combo. http://67-72chevytrucks.com/vboard/s...threadid=33702 __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746

12-28-2002, 02:55 PM	#13
OLDCHEV4X4 Registered User Join Date: Apr 2000 Location: Chester County PA, USA Posts: 1,228	The splined sleeve is available from GM , but only the 70 and up sleeve. The 69 sleeve is NLA. You can convert to the newer sleeve. It is cheaper to go to 4xheaven (800-800-1679) for the sleeve. $70 from them and around $140 from GM. Randy __________________ 72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania

12-31-2002, 09:19 AM	#14
keenee Registered User Join Date: Mar 2002 Location: Houston, Pennsylvania Posts: 231	First- The 400/205 is the strongest auto setup out there Second- It will fit a 67-72 with mods to the location of the trans crossmember (easy, slide it back and drill new holes) and mods to the driveshafts (front gets longer, rear gets shorter). I would get the driveshafts from the 1 ton along with the tranny/t-case, take all the shafts to your local driveline guy with some measurements and he will make you just what you need __________________ '96 GMC Suburban 6.5t '99 F**d Windstar '07 SON '09 DAUGHTER XOXOXO Wife



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.