4x4 convert to 2wd - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bad_turbo · 01-12-2010, 12:26 PM

Sorry guys, but I can't find that thread on converting a 4x4 to a 2wd. Tried the search option with no luck. Can anyone link it for me? My 4spd and t/c have decided to go south and I can't afford to fix them right now, but I remember a thread on here a while back that talked about throwing a 2wd auto transmission in and it would bolt right up without even having to modify the driveshaft. Can anyone help me find that thread. My mechanic tells me its impossible to put a 2wd auto trans in my 4wd burb without serious mods to the driveshaft and I'm hoping to prove him wrong. Thanks for your help guys and gals.

82swampthing · 01-12-2010, 01:10 PM

just get another 4spd and transfer case from the bone yard you will save your self alot of time and money. your mechanics right by the way, automatic transmissions have a splined shaft coming out the back which requires a splined yoke to go with it on the end of the drive shaft. where as with your suburban im guessing you have sm465 4spd / np205 tc , the 205 tc has a out put yoke that accepts a universal joint from the end of the slip yoke on your drive shaft.The only other way around this is if you got the driveshaft and the transmission crossmember from a 2wd suburban with a automatic , if really want an automatic.but even then the drive shaft might not be long enough because 4x4 sit alot higher and it won't reach. hope this helps

benoit454 · 01-12-2010, 02:58 PM

ok I'm confused every driveshaft I ever seen had splines in it and was a yoke/slip yoke on the end and u joint on the back end. My 88 has a splined slip yoke or whatever on the front of it to go into my t-case. I don't see why a 2wd with a 2wd DS wouldn't work the 4x4 shaft is alot shorter because of the t-case and 2wd would be longer, I don't think being 4x4 it be too tall for it dunno though. If all else fails or you are worried if you have a short bed and reg cab get an ext cab DS or long bed 2wd one to go with the 2wd trans. You'd probably need the 2wd crossmember as well so I'd get it and then you can drill the frame to bolt it in. So yea I don't think it's a throw in and go job, but have to change modify some things.

72 CustomCamper · 01-12-2010, 07:31 PM

This one?

http://67-72chevytrucks.com/vboard/s...d.php?t=168231

Chuck

01-12-2010, 12:26 PM	#1
bad_turbo turbo enthusiast Join Date: Jan 2004 Location: carmichael, ca. Posts: 1,826	4x4 convert to 2wd Sorry guys, but I can't find that thread on converting a 4x4 to a 2wd. Tried the search option with no luck. Can anyone link it for me? My 4spd and t/c have decided to go south and I can't afford to fix them right now, but I remember a thread on here a while back that talked about throwing a 2wd auto transmission in and it would bolt right up without even having to modify the driveshaft. Can anyone help me find that thread. My mechanic tells me its impossible to put a 2wd auto trans in my 4wd burb without serious mods to the driveshaft and I'm hoping to prove him wrong. Thanks for your help guys and gals. __________________ "But daddy, I didn't hit them all with a stick"...what my 6 year old tells me when I pick him up from school early for fighting "

01-12-2010, 01:10 PM	#2
82swampthing Registered User Join Date: Aug 2009 Location: taxachusetts Posts: 138	Re: 4x4 convert to 2wd just get another 4spd and transfer case from the bone yard you will save your self alot of time and money. your mechanics right by the way, automatic transmissions have a splined shaft coming out the back which requires a splined yoke to go with it on the end of the drive shaft. where as with your suburban im guessing you have sm465 4spd / np205 tc , the 205 tc has a out put yoke that accepts a universal joint from the end of the slip yoke on your drive shaft.The only other way around this is if you got the driveshaft and the transmission crossmember from a 2wd suburban with a automatic , if really want an automatic.but even then the drive shaft might not be long enough because 4x4 sit alot higher and it won't reach. hope this helps __________________ R.I.P gm 1908-1986 1982 chevy k20,350,sm465,np205,10bolt and 14bolt s.f

01-12-2010, 02:58 PM	#3
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: 4x4 convert to 2wd ok I'm confused every driveshaft I ever seen had splines in it and was a yoke/slip yoke on the end and u joint on the back end. My 88 has a splined slip yoke or whatever on the front of it to go into my t-case. I don't see why a 2wd with a 2wd DS wouldn't work the 4x4 shaft is alot shorter because of the t-case and 2wd would be longer, I don't think being 4x4 it be too tall for it dunno though. If all else fails or you are worried if you have a short bed and reg cab get an ext cab DS or long bed 2wd one to go with the 2wd trans. You'd probably need the 2wd crossmember as well so I'd get it and then you can drill the frame to bolt it in. So yea I don't think it's a throw in and go job, but have to change modify some things. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

01-12-2010, 07:31 PM	#4
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	Re: 4x4 convert to 2wd This one? http://67-72chevytrucks.com/vboard/s...d.php?t=168231 Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"



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