transfercase

joeydeherrera54 · 04-24-2007, 09:45 PM

well ive been having problems with my transfercase and i found out there is alot of metal in there so i was calling around to find one and i found the same one the only difference is one is from a automatic and mine is a manual i was told you can pull the plate off where the transfercase meets the transmission and switch them out and it will work do any of you know if it will i just want to find out before i buy it o yea my truck is a 83 gmc k1500 and the transfercase is a gm 208

75K30 · 04-24-2007, 10:44 PM

there are 2 different input shaft options for the G.M. NP208
I believe that the autos have 27 spline inputs. Thos are the small autos like the 700, and the 350.
The 400, and the SM 465 units had 32 splines. Obviously the 32 spline unit is the stronger one. As far as the bolt patern, they all had a 6 bolt round pattern. The Chevy pattern is almost symetrical, but it is not. Not that that is important, but you might want to know.
Guess all of the adapters are the same, so you may want to verify the spline count on the input shaft, or you will be taking the cases apart to install the right one.

joeydeherrera54 · 04-25-2007, 04:33 PM

ok but does it make a difference from if one was one a automatic and the other is from a manuel or are they the same. well anything else beside the spline

75K30 · 04-25-2007, 09:08 PM

The input splines are probably the most important part. If it does not engage the splines from the output shaft it won't fit. It is a fair amount of work to change the input shaft, and different output shafts from the trans are only availabe aftermarket, and as expensive as a used case with the right shaft.
To answer your question; no the case does not care whether or not an automatic is in front of it, or a manual. It is just a 2 speed range box with an output shaft for the front differential.

04-24-2007, 09:45 PM	#1
joeydeherrera54 Senior Member Join Date: Jan 2007 Location: grand junction colorado Posts: 79	transfercase well ive been having problems with my transfercase and i found out there is alot of metal in there so i was calling around to find one and i found the same one the only difference is one is from a automatic and mine is a manual i was told you can pull the plate off where the transfercase meets the transmission and switch them out and it will work do any of you know if it will i just want to find out before i buy it o yea my truck is a 83 gmc k1500 and the transfercase is a gm 208

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04-24-2007, 10:44 PM	#2
75K30 Senior Member Join Date: Jul 2006 Posts: 2,992	there are 2 different input shaft options for the G.M. NP208 I believe that the autos have 27 spline inputs. Thos are the small autos like the 700, and the 350. The 400, and the SM 465 units had 32 splines. Obviously the 32 spline unit is the stronger one. As far as the bolt patern, they all had a 6 bolt round pattern. The Chevy pattern is almost symetrical, but it is not. Not that that is important, but you might want to know. Guess all of the adapters are the same, so you may want to verify the spline count on the input shaft, or you will be taking the cases apart to install the right one.

04-25-2007, 04:33 PM	#3
joeydeherrera54 Senior Member Join Date: Jan 2007 Location: grand junction colorado Posts: 79	ok but does it make a difference from if one was one a automatic and the other is from a manuel or are they the same. well anything else beside the spline

04-25-2007, 09:08 PM	#4
75K30 Senior Member Join Date: Jul 2006 Posts: 2,992	The input splines are probably the most important part. If it does not engage the splines from the output shaft it won't fit. It is a fair amount of work to change the input shaft, and different output shafts from the trans are only availabe aftermarket, and as expensive as a used case with the right shaft. To answer your question; no the case does not care whether or not an automatic is in front of it, or a manual. It is just a 2 speed range box with an output shaft for the front differential.