1968 GMC 4x4 Conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BBGMC · 12-26-2008, 06:04 AM

I have a 1968 GMC 2500 Custom with a big block 396 and Th400 trans I was wondering is it possible to convert my 2wd to a 4x4 I have a dana 60 rear and was thinking of getting a 60 or a 44 for the front depending on if I could find the 60 if it is possible has any one ever done it? and if so what all would need to be changed to accomplish this?

haysonj · 12-26-2008, 08:59 AM

This can be done but in all likelihood you would be better off to find a 4x4 doner truck. on the front you need the springs and perches along with the shackles. You can use your T400 but the main shaft will have to be replaced and you will need the adapter and the transfer case plus modifying your drive shaft and a few other minor things. I went to a 208 on mine but the original 205 is a stronger unit. All in all I would recommend you find a 4x4 doner truck.

BBGMC · 12-27-2008, 03:22 AM

ok thank you thats 3 for 3 Ive asked my friends and 4x4 shops its staying a 2wd thanks

**special-K** · 12-27-2008, 08:26 AM

Just a note from the Forum Staff...
Please don`t cross post(repetitve posts in multiple forums)per site rules.Pick the one and go with it.If another place seems more appropriate,delete the thread and post.Thanks

*FormerMember* · 12-27-2008, 11:32 AM

...

**special-K** · 12-27-2008, 01:31 PM

This was a 2wd w/coil rear.It still has a coil rear

:

DBear · 12-31-2008, 03:34 AM

that is pretty damn cool

BurnoutNova · 12-31-2008, 04:33 AM

your going to have a hard time finding the output shaft, adapter and a t-case to retrofit your th400 to a np205... Im not entirely sure whats involved but I think it would be much easier to get a th350/np205, or a sm465/np205 setup and use that. You'll also spend a fortune buying those parts unless you stumble upon a deal of a lifetime.

Also, a Dand 60 is unneccesary in most cases, and also will be a huge money pit. Where as a rebuilt Dand 44 will most likely suit you just fine.

Overall, I think it would be much easier to get a 4x4 donor frame with running gear already there. Here in Nebraska you can pick up a frame with axles for a couple hundred bucks, and a trans/ tcase setup for nut to much more. seems much easier to me than moving motor mounts, swapping crossmembers, putting spring perches on, getting a t-case and drivehsaft set up... ect.

The frames are still diffrent also, even tho your GMC should have leafs in the back the rear section of the frame rail isnt straight, and a true K frame is. Not a big deal but it is diffrent.

12-26-2008, 06:04 AM	#1
BBGMC Registered User Join Date: Oct 2007 Location: Portland, OR Posts: 49	1968 GMC 4x4 Conversion I have a 1968 GMC 2500 Custom with a big block 396 and Th400 trans I was wondering is it possible to convert my 2wd to a 4x4 I have a dana 60 rear and was thinking of getting a 60 or a 44 for the front depending on if I could find the 60 if it is possible has any one ever done it? and if so what all would need to be changed to accomplish this?

12-26-2008, 08:59 AM	#2
haysonj Registered User Join Date: Dec 2007 Location: Santa Maria, Ca. Posts: 1,423	Re: 1968 GMC 4x4 Conversion This can be done but in all likelihood you would be better off to find a 4x4 doner truck. on the front you need the springs and perches along with the shackles. You can use your T400 but the main shaft will have to be replaced and you will need the adapter and the transfer case plus modifying your drive shaft and a few other minor things. I went to a 208 on mine but the original 205 is a stronger unit. All in all I would recommend you find a 4x4 doner truck. __________________ 69 Chevy 4x4 383 Power

12-27-2008, 03:22 AM	#3
BBGMC Registered User Join Date: Oct 2007 Location: Portland, OR Posts: 49	Re: 1968 GMC 4x4 Conversion ok thank you thats 3 for 3 Ive asked my friends and 4x4 shops its staying a 2wd thanks

12-27-2008, 08:26 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1968 GMC 4x4 Conversion Just a note from the Forum Staff... Please don`t cross post(repetitve posts in multiple forums)per site rules.Pick the one and go with it.If another place seems more appropriate,delete the thread and post.Thanks __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

12-27-2008, 11:32 AM	#5
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	Re: 1968 GMC 4x4 Conversion ... Last edited by FormerMember; 04-02-2009 at 04:06 PM.

12-27-2008, 01:31 PM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1968 GMC 4x4 Conversion This was a 2wd w/coil rear.It still has a coil rear: __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 12-27-2008 at 01:33 PM.

12-31-2008, 03:34 AM	#7
DBear Registered User Join Date: Nov 2008 Location: Rowlett, TX Posts: 867	Re: 1968 GMC 4x4 Conversion that is pretty damn cool

12-31-2008, 04:33 AM	#8
BurnoutNova Registered User Join Date: Mar 2004 Location: CA Posts: 2,057	Re: 1968 GMC 4x4 Conversion your going to have a hard time finding the output shaft, adapter and a t-case to retrofit your th400 to a np205... Im not entirely sure whats involved but I think it would be much easier to get a th350/np205, or a sm465/np205 setup and use that. You'll also spend a fortune buying those parts unless you stumble upon a deal of a lifetime. Also, a Dand 60 is unneccesary in most cases, and also will be a huge money pit. Where as a rebuilt Dand 44 will most likely suit you just fine. Overall, I think it would be much easier to get a 4x4 donor frame with running gear already there. Here in Nebraska you can pick up a frame with axles for a couple hundred bucks, and a trans/ tcase setup for nut to much more. seems much easier to me than moving motor mounts, swapping crossmembers, putting spring perches on, getting a t-case and drivehsaft set up... ect. The frames are still diffrent also, even tho your GMC should have leafs in the back the rear section of the frame rail isnt straight, and a true K frame is. Not a big deal but it is diffrent. Last edited by BurnoutNova; 12-31-2008 at 04:34 AM.



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