TH350 and Driveshaft question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jmlcolorado · 01-03-2012, 08:41 PM

Bare with me if this is a stupid question, but im building a truck utilizing a 68 C10 chassis with factory axle on trailing arms. I have installed a SBC 350 with a Pontiac 350. I need to build a driveshaft for it and have found a 69 C10 shortbed in the scrap yard. It has a manual transmission in it. My TH350 has (obviously) a slip yoke at the output housing. The junk truck has a slip yoke built into the shaft itself and it mounted to the transmission the same way as the yoke on the axle, with small u bolts.
Can i just swap the output shaft yoke on the driveshaft with the TH350? Will it be a problem having 2 slip yokes built onto the driveshaft?

By the way, mine was a long bed, converted to short bed, eliminated the carrier bearing, and the junk truck is a shortbed.
If it is a problem having 2 slip yokes, would it be okay to weld the dlip yoke built onto the shaft solid and let the slip yoke into the trans do all the work?

EDIT: I dont know for fact the junk truck has a 3 speed, it is a manual on the floor though.

jmlcolorado · 01-03-2012, 08:55 PM

The junk trucks shaft looks like this.
Can i just remove the front ujoint and install a new ujoint with the TH350 slip yoke?

jmlcolorado · 01-04-2012, 01:38 AM

Anyone?

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MARKDTN · 01-04-2012, 08:48 AM

You cannot have 2 slip joints in the same driveshaft. A short TH350 and a 3-sp manual are the same length, you should be able to use that shaft if you have it.

jmlcolorado · 01-04-2012, 10:00 AM

That's what I thought.
Problem is I don't have any driveshaft. On top of that, I moved the engine/trans back in the frame 12" and down about 3", then the rear end was moved forward about 1". So I defiantly have to modify whatever drive shaft goes in.

Does anyone sell just the flange for driveshafts?
I can cut the entire front section of this shaft off to rid the built in slip yoke and install a normal flange.
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Lemield · 01-04-2012, 12:57 PM

I have a Gear Vendors overdrive in my CST so I had Englewood driveshaft build one for me. He is an honest guy and does great work. Small little shop but he seems to be able to build anything driveshaft wise. It is the only place I will go for driveshaft work. Just my 2 cents worth...

01-03-2012, 08:41 PM	#1
jmlcolorado Registered User Join Date: Dec 2010 Location: Elbert county, CO Posts: 249	TH350 and Driveshaft question Bare with me if this is a stupid question, but im building a truck utilizing a 68 C10 chassis with factory axle on trailing arms. I have installed a SBC 350 with a Pontiac 350. I need to build a driveshaft for it and have found a 69 C10 shortbed in the scrap yard. It has a manual transmission in it. My TH350 has (obviously) a slip yoke at the output housing. The junk truck has a slip yoke built into the shaft itself and it mounted to the transmission the same way as the yoke on the axle, with small u bolts. Can i just swap the output shaft yoke on the driveshaft with the TH350? Will it be a problem having 2 slip yokes built onto the driveshaft? By the way, mine was a long bed, converted to short bed, eliminated the carrier bearing, and the junk truck is a shortbed. If it is a problem having 2 slip yokes, would it be okay to weld the dlip yoke built onto the shaft solid and let the slip yoke into the trans do all the work? EDIT: I dont know for fact the junk truck has a 3 speed, it is a manual on the floor though. Last edited by jmlcolorado; 01-03-2012 at 08:51 PM.

01-03-2012, 08:55 PM	#2
jmlcolorado Registered User Join Date: Dec 2010 Location: Elbert county, CO Posts: 249	Re: TH350 and Driveshaft question The junk trucks shaft looks like this. Can i just remove the front ujoint and install a new ujoint with the TH350 slip yoke? Attached Images

01-04-2012, 01:38 AM	#3
jmlcolorado Registered User Join Date: Dec 2010 Location: Elbert county, CO Posts: 249	Re: TH350 and Driveshaft question Anyone? Posted via Mobile Device

01-04-2012, 08:48 AM	#4
MARKDTN Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 2,159	Re: TH350 and Driveshaft question You cannot have 2 slip joints in the same driveshaft. A short TH350 and a 3-sp manual are the same length, you should be able to use that shaft if you have it. __________________ '83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project

01-04-2012, 10:00 AM	#5
jmlcolorado Registered User Join Date: Dec 2010 Location: Elbert county, CO Posts: 249	Re: TH350 and Driveshaft question That's what I thought. Problem is I don't have any driveshaft. On top of that, I moved the engine/trans back in the frame 12" and down about 3", then the rear end was moved forward about 1". So I defiantly have to modify whatever drive shaft goes in. Does anyone sell just the flange for driveshafts? I can cut the entire front section of this shaft off to rid the built in slip yoke and install a normal flange. Posted via Mobile Device

01-04-2012, 12:57 PM	#6
Lemield Registered User Join Date: Dec 2004 Location: Arvada Colorado Posts: 1,321	Re: TH350 and Driveshaft question I have a Gear Vendors overdrive in my CST so I had Englewood driveshaft build one for me. He is an honest guy and does great work. Small little shop but he seems to be able to build anything driveshaft wise. It is the only place I will go for driveshaft work. Just my 2 cents worth... __________________ Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet"



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