The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 11-25-2009, 04:01 AM   #1
mickman77
Registered User
 
mickman77's Avatar
 
Join Date: Nov 2008
Location: The land of fruits and nuts, Kingsburg CA
Posts: 44
NV4500 to NP205 question.

I'm getting the parts together for this swap in my '77 K20. I have the tranny and I would like to know if there is any style NP205 that will bolt directly to the NV4500. If I understand other threads I've read correctly, a 205 out of an '86 and up 1 ton will bolt up without an adaptor as long as it has the 32 spline female input that was behind the turbo 400 with round 6 bolt pattern.

Thanks for any responses.
__________________
'77 K20 LWB 454, NV4500, NP205, 4.10's rollin on 33's passin everything but a gas station.
mickman77 is offline   Reply With Quote
Old 11-27-2009, 11:53 AM   #2
snj8198
Registered User
 
snj8198's Avatar
 
Join Date: Feb 2007
Location: Star Valley, WY
Posts: 1,992
Re: NV4500 to NP205 question.

Hi Mickman. Welcome to the board. You are correct, a round pattern 6 bolt 205 case with 32 spline input gear will mount directly to the back of your NV4500. It's a nice stout combo. -steve
__________________
Steve
1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's
snj8198 is offline   Reply With Quote
Old 11-27-2009, 09:40 PM   #3
mickman77
Registered User
 
mickman77's Avatar
 
Join Date: Nov 2008
Location: The land of fruits and nuts, Kingsburg CA
Posts: 44
Re: NV4500 to NP205 question.

Thanks for the reply Steve. Today was a good day. I picked up an NP 205 from behind an '87 1 ton with SM 465 tranny for $150.00. The Tcase has the long 32 spline female input and round 6 bolt pattern. Maybe have to shorten the NV output shaft? Or will there be enough endplay with that longer input shaft? I really don't want the output to bottom out and make any problems.
__________________
'77 K20 LWB 454, NV4500, NP205, 4.10's rollin on 33's passin everything but a gas station.
mickman77 is offline   Reply With Quote
Old 11-28-2009, 02:43 PM   #4
snj8198
Registered User
 
snj8198's Avatar
 
Join Date: Feb 2007
Location: Star Valley, WY
Posts: 1,992
Re: NV4500 to NP205 question.

Leave it alone and mount em up. There were 2 32 spine shafts through the years (short and long) in various apps but the NV uses the long and the input gear in deep. Im excited for you as this is a great combo! Only thing better would be to install a doubler and triple stick the assembly but this is probably a little overkill if your building a street rig. Good luck and have fun. -steve
__________________
Steve
1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's
snj8198 is offline   Reply With Quote
Old 11-28-2009, 10:38 PM   #5
mickman77
Registered User
 
mickman77's Avatar
 
Join Date: Nov 2008
Location: The land of fruits and nuts, Kingsburg CA
Posts: 44
Re: NV4500 to NP205 question.

Thanks again for the reply. I will have an NP 203 transfer case after the swap so, this may be an idea. I would rather have it and not need it than the other way around.

One thing I am curious about though is, the 4500 (241)is out of a '93 and the (SM465) 205 is out of an '87. Is there a commercially avaliable bracket for the xfer case shifter or am I going to have to fab one up?

Reason for the ??. I've seen on AA parts, a boss for mounting the 205 shift handle or bracket and my current setup doesn't have this. I can get one fabbed but would take some doing as I don't have access to welding equipment.
__________________
'77 K20 LWB 454, NV4500, NP205, 4.10's rollin on 33's passin everything but a gas station.
mickman77 is offline   Reply With Quote
Old 11-29-2009, 12:48 PM   #6
snj8198
Registered User
 
snj8198's Avatar
 
Join Date: Feb 2007
Location: Star Valley, WY
Posts: 1,992
Re: NV4500 to NP205 question.

crap i forgot about the shifter bracket! you will need this and it can be had from AA. I got mine from Gear Tech HD when i ordered my complete package (sorry i cant seem to find a part number in my receipts). It bolts to 2 flange bolts and a top cover bolt and incorporates a boss for the tcase shifter bolt, but this raises a couple of guestions for you.

1st: what is your current seat combo? clearance for the shifter with my bracket is tight using a bench.

2nd: are you seriously considering installing a doubler at this time or in the near future? you will need the appropriate shifters thus a different bracket.

These are not real big issues but something to be mindful of. If all fails look into cable shifters. They are sweet! but pricey.

Your NV is a '93, this is the wide ratio model that has pros and cons; it has the ultra deep 6.34:1 first gear ratio (vs 5.61:1) which as we know is great for crawling but makes for wider ratio from both 1st to 2nd gear as well as a wider spread from 2nd to 3rd which i found is not as friendly on the street. My buddys torguey diesel does fine with this trans but another's underpowered small block struggles especially when under load.

Finally what are you doing for a clutch setup? -steve
__________________
Steve
1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's
snj8198 is offline   Reply With Quote
Old 11-29-2009, 07:01 PM   #7
mickman77
Registered User
 
mickman77's Avatar
 
Join Date: Nov 2008
Location: The land of fruits and nuts, Kingsburg CA
Posts: 44
Re: NV4500 to NP205 question.

Well, I went out and tried to put the two together today. Found a couple of problems. The shafts fit perfectly but, the long snout on the 205 bottoms out 1.5 inches before they meet. 2nd problem, with the factory tailhousing, the inner shift rail lines up perfectly with the side of the housing. Didn't think to snap a pic but, will post one tomorrow. (gotta work tonight).

The clutch set up is the factory hydraulic set up. I know, right hand slave may cause driveshaft interference. Being the wide ratio shouldn't be a problem as I've got a 454 for power and gonna build another higher hp/tq output motor soon.

The twinstick idea would be somewhere down the road as this is my DD.

I've got the bench seat also but, down the road may be buckets if I can find a decent donor vehicle.

Stay tuned guys and gals, more to come...
__________________
'77 K20 LWB 454, NV4500, NP205, 4.10's rollin on 33's passin everything but a gas station.
mickman77 is offline   Reply With Quote
Old 12-02-2009, 10:10 PM   #8
mickman77
Registered User
 
mickman77's Avatar
 
Join Date: Nov 2008
Location: The land of fruits and nuts, Kingsburg CA
Posts: 44
Re: NV4500 to NP205 question.

Here are a couple of pics that I snapped with my cell phone. Kinda shows how they line up.
Attached Images
  
__________________
'77 K20 LWB 454, NV4500, NP205, 4.10's rollin on 33's passin everything but a gas station.
mickman77 is offline   Reply With Quote
Old 12-31-2009, 05:00 PM   #9
FLEET72
Registered User
 
FLEET72's Avatar
 
Join Date: Jan 2007
Location: Sonoma, CA
Posts: 521
Re: NV4500 to NP205 question.

Looks like you need a spacer in there, like this: http://advanceadapters.com/product/1...5-32T-T/C.html kinda pricey though.
__________________
Oscar
'72 Shortbed Fleetside
'95 Jimmy 4X4
'69 GMC Custom Camper

Last edited by FLEET72; 12-31-2009 at 05:00 PM.
FLEET72 is offline   Reply With Quote
Old 01-05-2010, 11:36 PM   #10
mickman77
Registered User
 
mickman77's Avatar
 
Join Date: Nov 2008
Location: The land of fruits and nuts, Kingsburg CA
Posts: 44
Re: NV4500 to NP205 question.

Or this...
Attached Images
   
__________________
'77 K20 LWB 454, NV4500, NP205, 4.10's rollin on 33's passin everything but a gas station.
mickman77 is offline   Reply With Quote
Old 01-08-2010, 04:50 PM   #11
doug70
Registered User
 
Join Date: Nov 2005
Location: Breckenridge, texas
Posts: 83
Re: NV4500 to NP205 question.

mickman77,

Did you buy your spacer or have it made? Any specs? I have a lathe and mill.
I am in the middle of this right now. I will be picking up the NV4500 on Monday. Should I get its tcase? Mine is a 27 spline 8 bolt pattern.

Doug
doug70 is offline   Reply With Quote
Old 03-08-2010, 07:30 PM   #12
mickman77
Registered User
 
mickman77's Avatar
 
Join Date: Nov 2008
Location: The land of fruits and nuts, Kingsburg CA
Posts: 44
Re: NV4500 to NP205 question.

After a month and a half, the driveline is holding up very well but, a vibration has emerged from somewhere. It starts at about 55-60 mph and worsens with speeds above that. It's my guess that the driveline is binding at the front joint. After the tranny swap, the rear driveline was lengthened and rebalanced with new u-joints (1350's) and knuckles on both ends. Fluid level is good in both the transfer and rear end..

Anybody a driveline expert that may have some input? Tried to get a couple of pics. Can get more if needed just let me know what you need to see.
Attached Images
  
__________________
'77 K20 LWB 454, NV4500, NP205, 4.10's rollin on 33's passin everything but a gas station.
mickman77 is offline   Reply With Quote
Old 03-08-2010, 07:33 PM   #13
mickman77
Registered User
 
mickman77's Avatar
 
Join Date: Nov 2008
Location: The land of fruits and nuts, Kingsburg CA
Posts: 44
Re: NV4500 to NP205 question.

Quote:
Originally Posted by doug70 View Post
mickman77,

Did you buy your spacer or have it made? Any specs? I have a lathe and mill.
I am in the middle of this right now. I will be picking up the NV4500 on Monday. Should I get its tcase? Mine is a 27 spline 8 bolt pattern.

Doug
Sorry for the delay Doug.
I took the material and a gasket to a local machinist and he turned it on his CNC machine. I didn't get the layout or programming for it.
__________________
'77 K20 LWB 454, NV4500, NP205, 4.10's rollin on 33's passin everything but a gas station.
mickman77 is offline   Reply With Quote
Old 03-10-2010, 03:43 PM   #14
profe56
Registered User
 
Join Date: Nov 2008
Location: Chula Vista California
Posts: 481
Re: NV4500 to NP205 question.

Hi MICKMAN : I just like to say Hi , you send me back in the time over 32 years ago, I used to work in Kinsburg en la tabla (grape) yes!!! a lot of fruit. every year I had to meet the manager at The Office bar to be hired.
PD is the Office bar exist?
profe56 is offline   Reply With Quote
Old 03-13-2010, 03:46 AM   #15
4x4Poet
Registered User
 
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,835
Re: NV4500 to NP205 question.

Not much of an angle to cause binding.

I'd check if the pinion and NP205 output yokes have any side to side play.
__________________
'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.
4x4Poet is offline   Reply With Quote
Old 09-17-2010, 05:00 PM   #16
BIGCHEVYMAN
Senior Member
 
BIGCHEVYMAN's Avatar
 
Join Date: Apr 2002
Location: Portland , Tennessee , United States
Posts: 1,024
Re: NV4500 to NP205 question.

do you still have the dimensions on the plate you had made? i am getting ready to do the same swap.
BIGCHEVYMAN is offline   Reply With Quote
Old 12-21-2013, 03:38 AM   #17
1971 cheburban
Registered User
 
Join Date: Jul 2013
Location: Wellsville,ohio
Posts: 140
Re: NV4500 to NP205 question.

I may be doing this swap in a 78 k20, I just wanted to know what crossmember and clutch setup did you use and how much total did you have in it. Also is it nicer to shift a 465 or is it the same clunking kind of shift, thanks for any replie
1971 cheburban is offline   Reply With Quote
Old 03-14-2017, 02:56 AM   #18
503markh
Registered User
 
Join Date: Mar 2017
Location: Parkrose, OR
Posts: 1
Re: NV4500 to NP205 question.

That's a great setup, I will be doing the same combo with my 4x4 pickup. Just trying to figure out what gear ratio I need to use with 37" tires.
503markh is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 02:53 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com