NP205 to TH400 adapter problem - Pirate4x4.Com : 4x4 and Off-Road Forum

1976 F100 project · 04-17-2011, 03:54 PM

I have a 86 2500 suburban with the 6.2 Detroit diesel. Originally had a NP208 behind a TH400. I'm swapping the 208 for a 205. Just picked up a 205 out of a 87 K30. Went to bolt it on and it wouldn't mate up. There is about 1" between the tailhousing and the 205 case. I need a tailhousing that would be able to mate the long shaft instead of the short shaft 205 input. Because this truck is a diesel it is a J code. I need to know where I can find a TH400 long shaft tailhousing to mate to the round 6 bolt pattern on the 205. Please let me know where I can find this it has been very difficult finding one

trkklr77 · 04-17-2011, 05:37 PM

which 32spl input gear do you have? long or short?

exactly how long is the 208 adapter and the tail shaft from the th400?

jd8420 · 04-17-2011, 09:48 PM

208 and round 205 use the same transmission tailshaft with 2.375" stick-out. If you are trying to use the 2.5" 208 adapter, it will not work. You need the 4" 205/TH400 round adapter.

geo in a K5 · 04-17-2011, 10:04 PM

I'm gonna guess he has a long shaft 32 spline 205 from behind a sm465

trkklr77 · 04-17-2011, 10:25 PM

Quote:

Originally Posted by geo in a K5

I'm gonna guess he has a long shaft 32 spline 205 from behind a sm465

the long input was also used in late 86ish+ th400.

geo in a K5 · 04-17-2011, 10:38 PM

Quote:

Originally Posted by trkklr77

the long input was also used in late 86ish+ th400.

This I didn't know, was there a reason for the different length shafts for the th400 to 205 combo?

trkklr77 · 04-17-2011, 10:49 PM

i "thought" it was so that they could use the same output shaft and addapter as the 208/241.

but jd8420 say that you need a 4" round adapter......

sweetk30 · 04-18-2011, 04:16 PM

cant use the 208/241 adaptor on 205.

were will the shifter pivot bolt go ? as the 208/241 use floor pan mounted shifter.

trkklr77 · 04-18-2011, 05:50 PM

Quote:

Originally Posted by sweetk30

cant use the 208/241 adaptor on 205.

were will the shifter pivot bolt go ? as the 208/241 use floor pan mounted shifter.

duh,

youre right.

geo in a K5 · 04-18-2011, 07:01 PM

This makes me question whether there actually was a long shaft used in the 205 to mate to the 400.

jd8420 · 04-18-2011, 08:54 PM

6 bolt round 205's use a long input on the 205 and a 2.375" transmission shaft (same as 208/241). Figure 8 or racetrack 205's use a short input and a 4.5" transmission shaft. All TH400 to NP205 adapters are 4 inches thick.

1976 F100 project · 04-18-2011, 08:57 PM

Does advance adapters have this?

bigk588 · 04-18-2011, 09:18 PM

Quote:

Originally Posted by 1976 F100 project

I have a 86 2500 suburban with the 6.2 Detroit diesel. Originally had a NP208 behind a TH400. I'm swapping the 208 for a 205. Just picked up a 205 out of a 87 K30. Went to bolt it on and it wouldn't mate up. There is about 1" between the tailhousing and the 205 case. I need a tailhousing that would be able to mate the long shaft instead of the short shaft 205 input. Because this truck is a diesel it is a J code. I need to know where I can find a TH400 long shaft tailhousing to mate to the round 6 bolt pattern on the 205. Please let me know where I can find this it has been very difficult finding one

I went through that same issue.I cut the tail shaft of my thm 400 and used the round to 8 bolt adapter.2 years an works like it should.Also O.R.D sells all those hard to find adapters,or I have a 6 hole to 6 hole 4"deep adapter that was made for the problem you have for sale 100$ I also have a round bolt to round bolt (208 to thm 400) stock adapter 150$.

KWTMECH · 04-19-2011, 08:04 AM

You could also install the short 32 spline input into the 205

Grumpy_old_fart · 04-19-2011, 08:34 AM

Quote:

Originally Posted by KWTMECH

You could also install the short 32 spline input into the 205

thats what I did... worked great.

04-17-2011, 03:54 PM	#1 (permalink)
1976 F100 project Registered User Join Date: Mar 2007 Member # 88251 Location: morgan hill, ca Posts: 82	NP205 to TH400 adapter problem I have a 86 2500 suburban with the 6.2 Detroit diesel. Originally had a NP208 behind a TH400. I'm swapping the 208 for a 205. Just picked up a 205 out of a 87 K30. Went to bolt it on and it wouldn't mate up. There is about 1" between the tailhousing and the 205 case. I need a tailhousing that would be able to mate the long shaft instead of the short shaft 205 input. Because this truck is a diesel it is a J code. I need to know where I can find a TH400 long shaft tailhousing to mate to the round 6 bolt pattern on the 205. Please let me know where I can find this it has been very difficult finding one

04-17-2011, 05:37 PM	#2 (permalink)
trkklr77 skullfuckery Join Date: Apr 2004 Member # 29016 Location: galt ca, because i wanted my own backyard Posts: 15,232	which 32spl input gear do you have? long or short? exactly how long is the 208 adapter and the tail shaft from the th400? __________________ Impeach or revolt, which will it be? buy my quad http://www.pirate4x4.com/forum/vehic...00-2500-a.html I WILL TRADE FOR A ROAD WORTHY 55-57 or 71-87 CHEVY 2WD PICK UP

04-17-2011, 10:49 PM	#7 (permalink)
trkklr77 skullfuckery Join Date: Apr 2004 Member # 29016 Location: galt ca, because i wanted my own backyard Posts: 15,232	i "thought" it was so that they could use the same output shaft and addapter as the 208/241. but jd8420 say that you need a 4" round adapter...... __________________ Impeach or revolt, which will it be? buy my quad http://www.pirate4x4.com/forum/vehic...00-2500-a.html I WILL TRADE FOR A ROAD WORTHY 55-57 or 71-87 CHEVY 2WD PICK UP

04-18-2011, 04:16 PM	#8 (permalink)
sweetk30 Registered User Join Date: Oct 2006 Member # 80500 Location: horseheads, ny Posts: 148	cant use the 208/241 adaptor on 205. were will the shifter pivot bolt go ? as the 208/241 use floor pan mounted shifter. __________________ if you can't play nice then STFU. Don't get pissed & go flaming someone cause you SUCK !

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

04-17-2011, 09:48 PM	#3 (permalink)
jd8420 Cotton Farmer Join Date: Aug 2010 Member # 167491 Location: Roby Texas Posts: 92	208 and round 205 use the same transmission tailshaft with 2.375" stick-out. If you are trying to use the 2.5" 208 adapter, it will not work. You need the 4" 205/TH400 round adapter.

04-17-2011, 10:04 PM	#4 (permalink)
geo in a K5 Registered User Join Date: Jul 2009 Member # 138801 Location: So Cal Posts: 1,101	I'm gonna guess he has a long shaft 32 spline 205 from behind a sm465

04-18-2011, 07:01 PM	#10 (permalink)
geo in a K5 Registered User Join Date: Jul 2009 Member # 138801 Location: So Cal Posts: 1,101	This makes me question whether there actually was a long shaft used in the 205 to mate to the 400.

04-18-2011, 08:54 PM	#11 (permalink)
jd8420 Cotton Farmer Join Date: Aug 2010 Member # 167491 Location: Roby Texas Posts: 92	6 bolt round 205's use a long input on the 205 and a 2.375" transmission shaft (same as 208/241). Figure 8 or racetrack 205's use a short input and a 4.5" transmission shaft. All TH400 to NP205 adapters are 4 inches thick.

04-18-2011, 08:57 PM	#12 (permalink)
1976 F100 project Registered User Join Date: Mar 2007 Member # 88251 Location: morgan hill, ca Posts: 82	Does advance adapters have this?

04-19-2011, 08:04 AM	#14 (permalink)
KWTMECH Registered User Join Date: Sep 2002 Member # 13786 Location: moved 7 miles to colfax, ca. Posts: 4,224	You could also install the short 32 spline input into the 205