700R4 and NP205 combo - The 1947 - Present Chevrolet & GMC Truck Message Board Network

s_nova69 · 01-16-2011, 06:32 PM

I put a 700r4 and np205 behind a 500hp 406 in my 78 k20 and it was awesome. I did not move the engine forward but had the drivelines lengthened/shortened. I didnt actually think of moving the engine forward at the time. My truck had 6" w 35's and 4.10 gears and turned 2100 at 65ish on the freeway. I had trouble getting the shift points right where I liked them but finally was able to tune the govenor with a TCI tuning kit. I bought the AA output shaft and aluminum adapter. The only problem I had was that I initially forgot to install the seal on the coupler so my tcase filled with ATF.
I thought the combo worked really well and would recomend it even though the new parts from AA cost a bundle. Phil

72Cheyenne454 · 01-19-2011, 02:30 PM

For those of you that have installed a 700R4 in front of a NP205 transfer case using the Advance Adapter "special" output shaft, have you had clearance issues with the front drive shaft and transmision oil pan.

I thought I had read a post sometime back that mentioned if you were running stock front springs (no lift kit) and used the AA output shaft, you would run into an issue with the CV joint/front shaft coming in to contact with the rear corner of the 700R4 pan.

Can anyone confirm this?

Thanks,

1malo68 · 01-19-2011, 06:00 PM

In the paperwork that you get with the AA output shaft it says exactly that. But I don't know if moving the engine forward 1.75" will help that or not. Seems it should. If you moved the transfer case crossmember back it just might be an issue.

72Cheyenne454 · 01-20-2011, 09:50 PM

Quote:

Originally Posted by 72Cheyenne454

For those of you that have installed a 700R4 in front of a NP205 transfer case using the Advance Adapter "special" output shaft, have you had clearance issues with the front drive shaft and transmision oil pan.

I thought I had read a post sometime back that mentioned if you were running stock front springs (no lift kit) and used the AA output shaft, you would run into an issue with the CV joint/front shaft coming in to contact with the rear corner of the 700R4 pan.

Can anyone confirm this?

Thanks,

Anyone else have first hand experience with this?

Thanks!

KrazyRay · 01-21-2011, 01:30 AM

I don't have first hand experience as mine has a 4" lift, but I think some of the bulky square body cv joints on the driveline could cause that problem. The 72 cv joint is smaller than some of them that I've seen on the later trucks.

*72longbed* · 01-21-2011, 07:48 PM

Just like Ray says, mine has a 4" lift also. Is it close ... yes. Does it hit ... No. I have had my truck "articulated" in 4 wheel drive and the driveshaft has not touched the pan while wheeling.

Is it close? ... yes.

01-16-2011, 06:32 PM	#1
s_nova69 Registered User Join Date: Jul 2007 Location: slc, ut Posts: 318	Re: 700R4 and NP205 combo I put a 700r4 and np205 behind a 500hp 406 in my 78 k20 and it was awesome. I did not move the engine forward but had the drivelines lengthened/shortened. I didnt actually think of moving the engine forward at the time. My truck had 6" w 35's and 4.10 gears and turned 2100 at 65ish on the freeway. I had trouble getting the shift points right where I liked them but finally was able to tune the govenor with a TCI tuning kit. I bought the AA output shaft and aluminum adapter. The only problem I had was that I initially forgot to install the seal on the coupler so my tcase filled with ATF. I thought the combo worked really well and would recomend it even though the new parts from AA cost a bundle. Phil __________________ Phil '70 Longhorn 421 700r4 tach 4 wheel disc hydroboost daily driver '72 short super build 4wd '72 Suburban LT4 coming soon!!

01-19-2011, 02:30 PM	#2
72Cheyenne454 Registered User Join Date: Apr 2007 Location: San Diego Posts: 459	Re: 700R4 and NP205 combo For those of you that have installed a 700R4 in front of a NP205 transfer case using the Advance Adapter "special" output shaft, have you had clearance issues with the front drive shaft and transmision oil pan. I thought I had read a post sometime back that mentioned if you were running stock front springs (no lift kit) and used the AA output shaft, you would run into an issue with the CV joint/front shaft coming in to contact with the rear corner of the 700R4 pan. Can anyone confirm this? Thanks,

01-19-2011, 06:00 PM	#3
1malo68 Registered User Join Date: Aug 2010 Location: Lost Wages, NV Posts: 201	Re: 700R4 and NP205 combo In the paperwork that you get with the AA output shaft it says exactly that. But I don't know if moving the engine forward 1.75" will help that or not. Seems it should. If you moved the transfer case crossmember back it just might be an issue.

01-21-2011, 01:30 AM	#5
KrazyRay Registered User Join Date: Jun 2009 Location: Oroville, CA Posts: 4,827	Re: 700R4 and NP205 combo I don't have first hand experience as mine has a 4" lift, but I think some of the bulky square body cv joints on the driveline could cause that problem. The 72 cv joint is smaller than some of them that I've seen on the later trucks.

01-21-2011, 07:48 PM	#6
72longbed Account Suspended Join Date: Jun 2003 Location: PA Posts: 1,411	Re: 700R4 and NP205 combo Just like Ray says, mine has a 4" lift also. Is it close ... yes. Does it hit ... No. I have had my truck "articulated" in 4 wheel drive and the driveshaft has not touched the pan while wheeling. Is it close? ... yes. Last edited by 72longbed; 01-21-2011 at 07:48 PM.



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