ljbear - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ckhd · 01-07-2003, 10:25 AM

When you did your 4-speed to NV-4500 swap, what did you do between the transmission and the transfer case? It's not a direct swap, is it? Did you use the original '71 t-case?

ljbear · 01-08-2003, 07:19 PM

You are correct, the NV4500 doesn't bolt up without a different adapter and a few other modifications. Advance Adapter sells a complete kit to tie the two together, and if you're considering the swap I'd recomend talking to them first. I've attached a picture of the tranny and transfer case connected. The black section in the center is the TWO adapters it takes to hook them up. As well as the adapters there may be other issues inside to deal with depnding on how you start.

The SM465 4 speed uses a 10 spline output shaft and a coupler to tie to the NP205. The Input on the 205 is also a 10 spline male and has to be replaced with a new 32 spline female input shaft. This is the same shaft that would be used in a 205 that went to a TH400. If you change the shaft you also have to change the bearing, which is just a little larger on the outside than original, so the case has to be bored to accept the larger bearing. The hot setup would be to locate a 205 that was used behind a TH400, I tried but couldn't find one.

I don't know the specifics on the TH350/205 but I'd expect there are probably internal issues to deal with as well.

You will also have to change bellhousing, clutch, and possibly flywheel. I had to change flywheels because I'm using a 97 350 with one piece rear seal that won't work with my old flywheel. The bellhousing I'm using operates a hydraulic clutch, and puts the slave and arm to the right side of the motor, which could possibly cause problems hitting the driveline. I have a 4" lift so clearance seems adequate. The overall length pushed my crossmember back 2" so both drivelines will needed to be reworked. It's a pretty involved swap, but it turned out awesome.

Larry

*dtlilly* · 01-13-2003, 12:21 AM

That looks sweet! Is that the original color scheme? Mine is rebuilt, waiting to be put back in, but I painted everything flat black. I have built 350/built 350/built NP-205 and new adaptor. What gets what color?

ljbear · 01-13-2003, 12:41 AM

dtlilly,

I think the flat black is a better choice if you are looking for original or the restoration look. My transmission and transfer case are both powdercoated, nothing like original. I was trying to keep the entire chasis and undercarriage in the gray and black you see in the picture.

Larry

01-07-2003, 10:25 AM	#1
ckhd Registered User Join Date: Oct 2000 Location: St. Johns, Arizona Posts: 2,660	ljbear When you did your 4-speed to NV-4500 swap, what did you do between the transmission and the transfer case? It's not a direct swap, is it? Did you use the original '71 t-case? __________________ my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans?

01-08-2003, 07:19 PM	#2
ljbear Registered User Join Date: Jan 2003 Location: Emmett, Idaho Posts: 858	You are correct, the NV4500 doesn't bolt up without a different adapter and a few other modifications. Advance Adapter sells a complete kit to tie the two together, and if you're considering the swap I'd recomend talking to them first. I've attached a picture of the tranny and transfer case connected. The black section in the center is the TWO adapters it takes to hook them up. As well as the adapters there may be other issues inside to deal with depnding on how you start. The SM465 4 speed uses a 10 spline output shaft and a coupler to tie to the NP205. The Input on the 205 is also a 10 spline male and has to be replaced with a new 32 spline female input shaft. This is the same shaft that would be used in a 205 that went to a TH400. If you change the shaft you also have to change the bearing, which is just a little larger on the outside than original, so the case has to be bored to accept the larger bearing. The hot setup would be to locate a 205 that was used behind a TH400, I tried but couldn't find one. I don't know the specifics on the TH350/205 but I'd expect there are probably internal issues to deal with as well. You will also have to change bellhousing, clutch, and possibly flywheel. I had to change flywheels because I'm using a 97 350 with one piece rear seal that won't work with my old flywheel. The bellhousing I'm using operates a hydraulic clutch, and puts the slave and arm to the right side of the motor, which could possibly cause problems hitting the driveline. I have a 4" lift so clearance seems adequate. The overall length pushed my crossmember back 2" so both drivelines will needed to be reworked. It's a pretty involved swap, but it turned out awesome. Larry Attached Images __________________ Larry 72 Chevy SWB 4x4 71 Chevy SWB 4x4 My Work Truck "Don't confuse enthusiasm with capability"

01-13-2003, 12:21 AM	#3
dtlilly Account Suspended Join Date: Jan 2003 Location: Shadow of Lambeau Field Posts: 5,597	PICTURE That looks sweet! Is that the original color scheme? Mine is rebuilt, waiting to be put back in, but I painted everything flat black. I have built 350/built 350/built NP-205 and new adaptor. What gets what color?

01-13-2003, 12:41 AM	#4
ljbear Registered User Join Date: Jan 2003 Location: Emmett, Idaho Posts: 858	dtlilly, I think the flat black is a better choice if you are looking for original or the restoration look. My transmission and transfer case are both powdercoated, nothing like original. I was trying to keep the entire chasis and undercarriage in the gray and black you see in the picture. Larry __________________ Larry 72 Chevy SWB 4x4 71 Chevy SWB 4x4 My Work Truck "Don't confuse enthusiasm with capability"



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