driveshaft ?'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

reverend · 10-14-2005, 11:54 PM

Does anyone know if the rear driveshaft on 1/2 tons is the same for 3/4 tons and what years will interchange with an 85 3/4 ton

bloertcher · 10-15-2005, 01:27 AM

Same length,but different U-Joint size.You can mix and match by using a combination joint,which will be bigger 1 way than the other.
I'm not dead solid on this,but I believe that the rear shaft should interchange on anything from 80-87,assuming you still have the original NP208.Also be aware that different transmissions will have different length driveshafts,such as a 4 speed shaft will be longer than an auto,etc.

*GoobersBlueBurban* · 10-16-2005, 12:23 PM

Be careful using other driveshafts. They may be okay, but have them balanced at a local driveshaft shop. If you are going to replace the u-joints use a Spicer style u-joint and dont use any cheap brand, because cheaper isn't always better.

86 GMG · 10-17-2005, 09:48 AM

i just put two new joint in my shaft they were precision brand i have always used these before but i had on side a 16th longer than the other side i finally got it installed but a big PITA this was the first time i have ever had this brand be wrong?

reverend · 10-17-2005, 10:17 PM

The ones I currently put in were precision lasted about 40,000. Figured I'd just put in a used shaft as this one has a six inch dent in it that I think is responsible for a vibration that probably took them out. Just wasn't 100% sure what years/styles interchanged but I assumed mid 70's to 87.

10-14-2005, 11:54 PM	#1
reverend Registered User Join Date: Oct 2005 Location: canada Posts: 2	driveshaft ?'s Does anyone know if the rear driveshaft on 1/2 tons is the same for 3/4 tons and what years will interchange with an 85 3/4 ton

10-16-2005, 12:23 PM	#3
GoobersBlueBurban Account Suspended Join Date: Oct 2005 Location: Paris Texas Posts: 161	Re: driveshaft ?'s Be careful using other driveshafts. They may be okay, but have them balanced at a local driveshaft shop. If you are going to replace the u-joints use a Spicer style u-joint and dont use any cheap brand, because cheaper isn't always better.

10-17-2005, 09:48 AM	#4
86 GMG Registered User Join Date: Apr 2005 Location: Tulsa Oklahoma Posts: 943	Re: driveshaft ?'s i just put two new joint in my shaft they were precision brand i have always used these before but i had on side a 16th longer than the other side i finally got it installed but a big PITA this was the first time i have ever had this brand be wrong? __________________ square body trucks an addiction or an investment either way they consume all my extra time and money

10-17-2005, 10:17 PM	#5
reverend Registered User Join Date: Oct 2005 Location: canada Posts: 2	Re: driveshaft ?'s The ones I currently put in were precision lasted about 40,000. Figured I'd just put in a used shaft as this one has a six inch dent in it that I think is responsible for a vibration that probably took them out. Just wasn't 100% sure what years/styles interchanged but I assumed mid 70's to 87.

10-15-2005, 01:27 AM	#2
bloertcher Registered User Join Date: Jul 2003 Location: Springfield,Mo. Posts: 305	Same length,but different U-Joint size.You can mix and match by using a combination joint,which will be bigger 1 way than the other. I'm not dead solid on this,but I believe that the rear shaft should interchange on anything from 80-87,assuming you still have the original NP208.Also be aware that different transmissions will have different length driveshafts,such as a 4 speed shaft will be longer than an auto,etc.



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