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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 1976Scottsdale on August 23, 2007, 03:02:23 PM

Title: How long is the driveshaft on a K-20 TH400, NP203, 14 bolt?
Post by: 1976Scottsdale on August 23, 2007, 03:02:23 PM

My 76 K-20 with the 4 speed blew the tranny this morning.  I am going to put my TH400 and NP203 back in since they are new anyway.  I need to know how much to shorten my driveshaft by to make it work.  If anyone knows, please help. ???

Title: Re: How long is the driveshaft on a K-20 TH400, NP203, 14 bolt?
Post by: Big78Chevy on August 23, 2007, 04:12:40 PM

Should be about the same. It's the front one you may need to find a replacement for. Your better off ditching the 203 while you at it. Too heavy & full time is never any good for a truck,(poor G.M. idea) especially these days with the gas prices..........P.S. With that 400 you have you could slap a 205 part time on it with a std.trans. rear shaft and it would work.(205 being shorter & 400 being longer).

Title: Re: How long is the driveshaft on a K-20 TH400, NP203, 14 bolt?
Post by: 1976Scottsdale on August 27, 2007, 05:54:24 AM

Yeah, but that costs more money than what I have at the moment.  The adaptor and sleeve alone are about $200.00.  I will just have to measure my distance once I have the 400 in there.  Then I can go to the high school I graduated from last may and shorten it.  The full time part does not bother me as the truck is just going to be for playing and hunting.