NP203 Mounting Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevy1TonFun · 01-17-2015, 10:01 PM

Does the 203 mount the same as a 205? Basically are the interchangeable on the cross member and frame mount?

franken · 01-18-2015, 12:03 AM

I'd say no. The 203 is much longer as well.

ray_mcavoy · 01-19-2015, 08:08 PM

There is an adapter that connects the transmission to the transfer case. It's this adapter (not the transmission or transfer case itself) that mounts to the crossmember.

There are multiple different adapters for various transmission & transfer case combinations. I don't know for sure, but I think most all of the adapters for a given transmission will allow the crossmember to stay in the same location.

The transfer case hangs off the back of the adapter so it's length shouldn't change the crossmember position. But it will change the required driveshaft lengths.

doubleclucker · 01-20-2015, 09:31 AM

The NP203 was only used on the 73'-79' trucks therefore the crossmembers were all the same between manual/automatic/np203/np205 foot style mount except the 1 ton 77'-79' model had a flatter member that did not drop down the 2" needed because of the wider frame.

01-17-2015, 10:01 PM	#1
Chevy1TonFun Grease Monkey Join Date: Oct 2007 Location: Fresno CA Posts: 750	NP203 Mounting Question Does the 203 mount the same as a 205? Basically are the interchangeable on the cross member and frame mount? __________________ Tow Rig: 2012 Chevy 2500HD CCSB LTZ Z71 4x4 Duramax Ultimate Offroad Build: 1978 Chevy Silverado K30 Crewcab Build Link http://67-72chevytrucks.com/vboard/s...d.php?t=654053 Mud Truck: 1972 Chevy Cheyenne K30 4x4, 468/400/205, D60/D70HD, 18" Custom Lift, 17x39" IROKs FOR SALE http://67-72chevytrucks.com/vboard/c...ton-4x4&cat=12

01-18-2015, 12:03 AM	#2
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,128	Re: NP203 Mounting Question I'd say no. The 203 is much longer as well.

01-19-2015, 08:08 PM	#3
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,366	Re: NP203 Mounting Question There is an adapter that connects the transmission to the transfer case. It's this adapter (not the transmission or transfer case itself) that mounts to the crossmember. There are multiple different adapters for various transmission & transfer case combinations. I don't know for sure, but I think most all of the adapters for a given transmission will allow the crossmember to stay in the same location. The transfer case hangs off the back of the adapter so it's length shouldn't change the crossmember position. But it will change the required driveshaft lengths.

01-20-2015, 09:31 AM	#4
doubleclucker Registered User Join Date: Jan 2014 Location: ONTARIO CANADA Posts: 130	Re: NP203 Mounting Question The NP203 was only used on the 73'-79' trucks therefore the crossmembers were all the same between manual/automatic/np203/np205 foot style mount except the 1 ton 77'-79' model had a flatter member that did not drop down the 2" needed because of the wider frame. __________________ 100:1 low gear!



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