1968 LB - 2 piece drive shaft question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tuff Gong · 02-26-2011, 02:12 PM

I'm headed to the junk yard for a driveshaft for a 1968 LB. Are the 2 piece drive shafts interchangeable for 67-72? Or can I only pull it out of a 68? Thanks.

**too much stuff** · 02-26-2011, 02:15 PM

Should make sure of your trans and rear end also. You need to match those up.

Tuff Gong · 02-26-2011, 02:25 PM

OK, so the trans, rear end and year need to match up? Is this correct?

Tuff Gong · 02-26-2011, 02:28 PM

The SPID reads

m35 powerglide trans
g50 HD rear spring

**mr48chev** · 02-26-2011, 03:17 PM

Quote:

Originally Posted by Brian Atkinson

OK, so the trans, rear end and year need to match up? Is this correct?

Yep, the back half should be the same length for long wheelbase trucks but the front half has to match the transmission you have.

I can't remember if the different rear ends take different U joints or not but that could be an issue.
If this pfd works it should give you the measurements for your transmission and you can see that it is within a few 16ths of a short shaft turbo 350 in length but you may have to swap front yokes to match the powerglide.

dmack91 · 02-26-2011, 03:18 PM

I think what they are referring to is that the connections need to match.

If you have the output shaft with yoke on the trans you are using, you need to make sure the driveline you find has the same U-joint size to match up with the output shaft. Same on the rear end - u-joint has to be the same size on the rear of the driveshaft and the rear-end. Overall length should also be confirmed.

If you don't have the output shaft with driveline yoke on the trans, you will have to make sure your donor will mate up with the trans output splines and diameter.

02-26-2011, 02:12 PM	#1
Tuff Gong Registered User Join Date: Jan 2011 Location: Glendale, AZ Posts: 3,178	1968 LB - 2 piece drive shaft question I'm headed to the junk yard for a driveshaft for a 1968 LB. Are the 2 piece drive shafts interchangeable for 67-72? Or can I only pull it out of a 68? Thanks. Last edited by Tuff Gong; 02-26-2011 at 02:12 PM.

02-26-2011, 02:15 PM	#2
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,792	Re: 1968 LB - 2 piece drive shaft question Should make sure of your trans and rear end also. You need to match those up. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

02-26-2011, 02:25 PM	#3
Tuff Gong Registered User Join Date: Jan 2011 Location: Glendale, AZ Posts: 3,178	Re: 1968 LB - 2 piece drive shaft question OK, so the trans, rear end and year need to match up? Is this correct?

02-26-2011, 02:28 PM	#4
Tuff Gong Registered User Join Date: Jan 2011 Location: Glendale, AZ Posts: 3,178	Re: 1968 LB - 2 piece drive shaft question The SPID reads m35 powerglide trans g50 HD rear spring

02-26-2011, 03:18 PM	#6
dmack91 Registered User Join Date: Jan 2011 Location: Redmond, OR Posts: 763	Re: 1968 LB - 2 piece drive shaft question I think what they are referring to is that the connections need to match. If you have the output shaft with yoke on the trans you are using, you need to make sure the driveline you find has the same U-joint size to match up with the output shaft. Same on the rear end - u-joint has to be the same size on the rear of the driveshaft and the rear-end. Overall length should also be confirmed. If you don't have the output shaft with driveline yoke on the trans, you will have to make sure your donor will mate up with the trans output splines and diameter. __________________ 68 Chev C20- son has it now 83 K20 - bought from son 70 C20 - in progress



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