T400 with NP205 questions? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cheyenne10 · 02-10-2005, 06:04 PM

Who can verify the lengths of a few setups for me. I would like distance from front of bell housing to center of yoke on rear output shaft of transfercase on a T400 and NP205 setup? Is there a difference in length depending on which model adapter is used? (there is the newer round adapter and figure 8 older version).

Also need the same on

a T350 and NP205 setup (version I will switch away from)?

and 700R4 with T350 adapter and NP205 transfercase?

I hope to pick one and keep the stock mounting location on transfercase cross member which allows me to keep my drivelines too and this will hopefully move motor new BB 2-2.5" forward in engine compartment.

I want to lay it all out before I buy a used setup to rebuild or order a Bowtie Overdrive 700R4 and find out lots of stuff moves or doesn't fit perfect.

thanks for advise and help.

Erl · 02-11-2005, 10:24 AM

I am also interested in this. TTT

barraza · 02-11-2005, 01:28 PM

The t350/205 stock combo is the shortest, IIRC a 700 is 1.625" longer than a t350 from bellhousing to rear.
There are 3 different lengths of t400 output shafts used in 4wd's. Several different 205 inputs,ie 32 spline short and long, 27 spline t350 type, and a coarse spline used on 4spds, most of which are not interchangable. Lot's of good info on the ORD site.
http://www.offroaddesign.com/catalog/doubler.htm

Moving the engine forward is a good way to do the swap. Just watch oil pan clearance to front axle, shouldnt be a problem with a small lift.

cheyenne10 · 02-11-2005, 05:20 PM

I think added length from T400 and 205 might help with moving engine forward to clear firewall. As far as I have read on offraod design page (and their pics) and others the input shaft on 205 that came behind T400 was the short female 32 spine version. I was hope to figure out if teh round and figure 8 adapter was same length. Also would like to know the length of the adpater kit AA sells to use 2 wheel drive T400 and my stock tranfercase with the 27 spline male input shaft.

The ORD website says they sell a conversion kit to modify my 205 to take the T400 adapter for $200. There is also some machine work to do to the 205 case. Then I need the T400 adapter and a good T400 to rebuild.

What are the different T400 trannys I will find?

Bram · 02-11-2005, 06:04 PM

Unfortunately I don't have my truck right now to give you measurements because it's getting painted, but wanted to say that I'm running a th400 and np205 with a big block in my 4x4. Basically what I did is connect all three together and dropped the transfer case in the original holes; this gave me plenty of firewall clearance with the BB, with no other mods like body lift. All I had to do was move the motor mounts forward and drill new holes. ORD is who I used for the th400/np205 conversion. Hope this helps a little?

cheyenne10 · 02-11-2005, 06:20 PM

A few questions.

Did you test fit your brake booster and alternator brackets?

Was ORD the suppler on trans or just conversion parts?

Did you use a TH350 transfercase to start with?

I assume that is a TH400 adapter, is it the newer round verison or older figure 8 version?

Do you remember how far the engine moved forward?

Very nice setup and great help.

thank you.

Bram · 02-11-2005, 06:41 PM

Hey cheyenne10,

Did you test fit your brake booster and alternator brackets?
Yes the fit was fine, I'm running a 90's model hydraboost, and the alternator fits just fine also.

Was ORD the suppler on trans or just conversion parts?
Just the conversion parts.

Did you use a TH350 transfercase to start with?
No I bought the transfer case from ORD.

I assume that is a TH400 adapter, is it the newer round verison or older figure 8 version?
Older figure eight.

Do you remember how far the engine moved forward?
I believe about 2 1/2 inches.

Thank you.

cheyenne10 · 02-12-2005, 02:08 AM

IS that the fixed yoke style rear 205 output shaft?

Can you share what T-case cost from ORD?

*72longbed* · 02-12-2005, 12:43 PM

Bram,
beautiful setup, Great Pics!!

Question: Who makes that electric fan setup you have?? Was it easy to wire??

Thanks,
72longbed

Bram · 02-12-2005, 08:31 PM

I got the fans with the Be Cool radiator. I also put in a brand new wiring harness, so yes it wasn't to bad to wire because it was pre-wired.

Bram · 02-14-2005, 12:08 PM

cheyenne10, yes it is the fixed yoke style. I don't remeber the total cost, but I can tell you it was expensive. If you give them a call they can tell you what it would cost for what you want to do, they are pretty good fokes.

02-10-2005, 06:04 PM	#1
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,511	T400 with NP205 questions? Who can verify the lengths of a few setups for me. I would like distance from front of bell housing to center of yoke on rear output shaft of transfercase on a T400 and NP205 setup? Is there a difference in length depending on which model adapter is used? (there is the newer round adapter and figure 8 older version). Also need the same on a T350 and NP205 setup (version I will switch away from)? and 700R4 with T350 adapter and NP205 transfercase? I hope to pick one and keep the stock mounting location on transfercase cross member which allows me to keep my drivelines too and this will hopefully move motor new BB 2-2.5" forward in engine compartment. I want to lay it all out before I buy a used setup to rebuild or order a Bowtie Overdrive 700R4 and find out lots of stuff moves or doesn't fit perfect. thanks for advise and help. __________________ Bob

02-11-2005, 10:24 AM	#2
Erl Registered User Join Date: Mar 2002 Location: Dallas, TX Posts: 555	I am also interested in this. TTT __________________ 1968 GMC 305 V6 3/4 4x4 Stepside 06 Corvette Daily Driver Dallas TX

02-11-2005, 05:20 PM	#4
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,511	length might help I think added length from T400 and 205 might help with moving engine forward to clear firewall. As far as I have read on offraod design page (and their pics) and others the input shaft on 205 that came behind T400 was the short female 32 spine version. I was hope to figure out if teh round and figure 8 adapter was same length. Also would like to know the length of the adpater kit AA sells to use 2 wheel drive T400 and my stock tranfercase with the 27 spline male input shaft. The ORD website says they sell a conversion kit to modify my 205 to take the T400 adapter for $200. There is also some machine work to do to the 205 case. Then I need the T400 adapter and a good T400 to rebuild. What are the different T400 trannys I will find? __________________ Bob

02-11-2005, 06:04 PM	#5
Bram Broke Join Date: Aug 2001 Location: West Plains,MO Posts: 385	Unfortunately I don't have my truck right now to give you measurements because it's getting painted, but wanted to say that I'm running a th400 and np205 with a big block in my 4x4. Basically what I did is connect all three together and dropped the transfer case in the original holes; this gave me plenty of firewall clearance with the BB, with no other mods like body lift. All I had to do was move the motor mounts forward and drill new holes. ORD is who I used for the th400/np205 conversion. Hope this helps a little? __________________ 72CheyenneSuper1ton4x4BigBlock

02-11-2005, 06:20 PM	#6
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,511	nice pics A few questions. Did you test fit your brake booster and alternator brackets? Was ORD the suppler on trans or just conversion parts? Did you use a TH350 transfercase to start with? I assume that is a TH400 adapter, is it the newer round verison or older figure 8 version? Do you remember how far the engine moved forward? Very nice setup and great help. thank you. __________________ Bob

02-11-2005, 01:28 PM	#3
barraza Registered User Join Date: Jul 2003 Location: N. Alabama Posts: 131	The t350/205 stock combo is the shortest, IIRC a 700 is 1.625" longer than a t350 from bellhousing to rear. There are 3 different lengths of t400 output shafts used in 4wd's. Several different 205 inputs,ie 32 spline short and long, 27 spline t350 type, and a coarse spline used on 4spds, most of which are not interchangable. Lot's of good info on the ORD site. http://www.offroaddesign.com/catalog/doubler.htm Moving the engine forward is a good way to do the swap. Just watch oil pan clearance to front axle, shouldnt be a problem with a small lift.

02-11-2005, 06:41 PM	#7
Bram Broke Join Date: Aug 2001 Location: West Plains,MO Posts: 385	Hey cheyenne10, Did you test fit your brake booster and alternator brackets? Yes the fit was fine, I'm running a 90's model hydraboost, and the alternator fits just fine also. Was ORD the suppler on trans or just conversion parts? Just the conversion parts. Did you use a TH350 transfercase to start with? No I bought the transfer case from ORD. I assume that is a TH400 adapter, is it the newer round verison or older figure 8 version? Older figure eight. Do you remember how far the engine moved forward? I believe about 2 1/2 inches. Thank you. __________________ 72CheyenneSuper1ton4x4BigBlock Last edited by Bram; 02-11-2005 at 07:01 PM.

02-12-2005, 02:08 AM	#8
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,511	205 rear output shaft IS that the fixed yoke style rear 205 output shaft? Can you share what T-case cost from ORD? __________________ Bob

02-12-2005, 12:43 PM	#9
72longbed Account Suspended Join Date: Jun 2003 Location: PA Posts: 1,411	Twin Electric Fan?? Bram, beautiful setup, Great Pics!! Question: Who makes that electric fan setup you have?? Was it easy to wire?? Thanks, 72longbed

02-12-2005, 08:31 PM	#10
Bram Broke Join Date: Aug 2001 Location: West Plains,MO Posts: 385	I got the fans with the Be Cool radiator. I also put in a brand new wiring harness, so yes it wasn't to bad to wire because it was pre-wired. __________________ 72CheyenneSuper1ton4x4BigBlock

02-14-2005, 12:08 PM	#11
Bram Broke Join Date: Aug 2001 Location: West Plains,MO Posts: 385	Fixed Yoke. cheyenne10, yes it is the fixed yoke style. I don't remeber the total cost, but I can tell you it was expensive. If you give them a call they can tell you what it would cost for what you want to do, they are pretty good fokes. __________________ 72CheyenneSuper1ton4x4BigBlock



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