Drive shaft for LONGBED, TH350 Conversion?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jess66chevy · 10-14-2009, 11:03 PM

I have a lonbed and put in a TH350 with a 9 inch tailshaft. Does anyone know off hand what size driveshaft I will now need? It will obviously have to be shortened. I thought someone has already done this ......By the way how do I measure what size driveshaft I need?

**DPowers** · 10-15-2009, 09:18 AM

R U staying with the 2 piece or going one piece? I stayed with the 2- piece and ended up cutting 4 3/4 inches off of the front one. But I am sure yours will be different. The best thing to do would be to contact the drive shaft shop that is going to cut the shaft for you and ask them how they want it measured. Here is a thread that may help-
http://67-72chevytrucks.com/vboard/s....php?p=3511906

ol Curt · 10-15-2009, 08:22 PM

I changed manual transmissions once and the shop told me exactly how they wanted it measured and they cut it and balanced very reasonably.

*LILRED66* · 10-15-2009, 08:29 PM

I recently converted a customer's C10 from a SM420, 4-speed & 2-piece drive shaft & carrier bearing, to a factory 3-speed Turbo HydraMatic with a single piece drive shaft and also eliminated the carrier bearing. I had a new shaft built to accept the slip yoke on the THM and the factory GM 12-bolt. Due to the increase length of a single shaft, versus a 2-piece, the new one was over 3" diameter, to keep it from coming apart at rpm. I paid $160.00, including entirely new shaft, U-joints, balancing and a fresh coat of undercarriage black paint...all in about 3 days.

jess66chevy · 10-21-2009, 12:56 AM

LILRED,
How did that 3 inch driveshaft fit in the round circle in the rear crossmember?

70 Suburban · 10-21-2009, 01:08 PM

Here if you take them your driveshaft they charge 150 to fit a new one for ya

10-14-2009, 11:03 PM	#1
jess66chevy Registered User Join Date: Jul 2009 Location: glendale, az Posts: 192	Drive shaft for LONGBED, TH350 Conversion?? I have a lonbed and put in a TH350 with a 9 inch tailshaft. Does anyone know off hand what size driveshaft I will now need? It will obviously have to be shortened. I thought someone has already done this ......By the way how do I measure what size driveshaft I need?

10-15-2009, 09:18 AM	#2
DPowers One foot in front of the other Join Date: Aug 2008 Location: Parrottsville, TN Posts: 5,440	Re: Drive shaft for LONGBED, TH350 Conversion?? R U staying with the 2 piece or going one piece? I stayed with the 2- piece and ended up cutting 4 3/4 inches off of the front one. But I am sure yours will be different. The best thing to do would be to contact the drive shaft shop that is going to cut the shaft for you and ask them how they want it measured. Here is a thread that may help- http://67-72chevytrucks.com/vboard/s....php?p=3511906

10-15-2009, 08:22 PM	#3
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: Drive shaft for LONGBED, TH350 Conversion?? I changed manual transmissions once and the shop told me exactly how they wanted it measured and they cut it and balanced very reasonably. __________________ 1966 Chevy C10 Longbed I'm Bob....ol Curt was my Grandpa The truck was his and he sure as heck wouldn't understand why I took a perfectly good truck and tore it down!

10-15-2009, 08:29 PM	#4
LILRED66 Account Suspended Join Date: May 2005 Location: Kansas City, KS Posts: 3,906	Re: Drive shaft for LONGBED, TH350 Conversion?? I recently converted a customer's C10 from a SM420, 4-speed & 2-piece drive shaft & carrier bearing, to a factory 3-speed Turbo HydraMatic with a single piece drive shaft and also eliminated the carrier bearing. I had a new shaft built to accept the slip yoke on the THM and the factory GM 12-bolt. Due to the increase length of a single shaft, versus a 2-piece, the new one was over 3" diameter, to keep it from coming apart at rpm. I paid $160.00, including entirely new shaft, U-joints, balancing and a fresh coat of undercarriage black paint...all in about 3 days.

10-21-2009, 12:56 AM	#5
jess66chevy Registered User Join Date: Jul 2009 Location: glendale, az Posts: 192	Re: Drive shaft for LONGBED, TH350 Conversion?? LILRED, How did that 3 inch driveshaft fit in the round circle in the rear crossmember?

10-21-2009, 01:08 PM	#6
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: Drive shaft for LONGBED, TH350 Conversion?? Here if you take them your driveshaft they charge 150 to fit a new one for ya __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)



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