driveshaft info 350/th400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mookandairin · 05-11-2014, 11:58 AM

hi all, I am not sure if I introduced myself or not but I am Dan. Ppl call me Soda. I am building a 64 stepside with a twin turbo, intercooled 355 give me aprox 800 HP @ 15# of boost. I got the mock up motor in there and the th400 what I need is a little info like how long of a shaft do I need or what can I take one out of? I got a slip yolk out of a th400 already and a shaft out of a 92(?) stepside that had a 4L60E is the thing in the ballpark or should I just get one and do it the hard way lol ( it seems everything is the hard way these days ). I been working on the wiring for about a week or so and got all the melted crap replaced and working ( the guy before me had no clue how to wire a thing and shorted out the whole thing ) The truck is made from several other trucks from all over the country and it has gmc harnesses to chevy harnesses ect ect. and from several years hence taking a while to fig it out ( colors didnt jive exactly ) so I had to use several diagrams lol. anyways a little help on driveshaft length would save a bit of time ya know.Thanks for all your help.

this is the motor going into the truck. It is sitting in my old project a 60 studebaker Lark. although the Lark never got finished due to the build list never getting shorter the motor is where the heart and sole is to any vehicle and it will rest upon a 64 chevy truck C10

as you can see I got a good project on my hands and it is real far. it has the disc brake conversion in the front ect ect. lmk what you all think about this one.

I will post more pix as I get more done. I hope you all like it
and this is me.

**PGSigns** · 05-11-2014, 08:24 PM

Get the engine and trans in and set and bolted to the mounts. Put the slip yoke in all the way and pull it out an inch. Measure the shaft length and get one made. The 12 bolt and the 400 use two different sizes of u-joints. Rear is a 1310 and a 400 is a 1350.
Jimmy

mookandairin · 05-12-2014, 02:21 PM

thanks for the info jimmy. That info will go to good use you can bet on it.thanks again.

66BigBackWindow · 05-12-2014, 02:53 PM

I have a 66 with a th400 that was never mounted. The motor mounts need to be moved back as well because it had a series of big blocks in it. I am sure that I will need to do some calculations there was well.

mookandairin · 05-13-2014, 11:59 AM

lmk what you find out as I will do the same. good luck and God Speed my friend.

05-11-2014, 11:58 AM	#1
mookandairin Registered User Join Date: May 2014 Location: Germantown Posts: 58	driveshaft info 350/th400 hi all, I am not sure if I introduced myself or not but I am Dan. Ppl call me Soda. I am building a 64 stepside with a twin turbo, intercooled 355 give me aprox 800 HP @ 15# of boost. I got the mock up motor in there and the th400 what I need is a little info like how long of a shaft do I need or what can I take one out of? I got a slip yolk out of a th400 already and a shaft out of a 92(?) stepside that had a 4L60E is the thing in the ballpark or should I just get one and do it the hard way lol ( it seems everything is the hard way these days ). I been working on the wiring for about a week or so and got all the melted crap replaced and working ( the guy before me had no clue how to wire a thing and shorted out the whole thing ) The truck is made from several other trucks from all over the country and it has gmc harnesses to chevy harnesses ect ect. and from several years hence taking a while to fig it out ( colors didnt jive exactly ) so I had to use several diagrams lol. anyways a little help on driveshaft length would save a bit of time ya know.Thanks for all your help. this is the motor going into the truck. It is sitting in my old project a 60 studebaker Lark. although the Lark never got finished due to the build list never getting shorter the motor is where the heart and sole is to any vehicle and it will rest upon a 64 chevy truck C10 as you can see I got a good project on my hands and it is real far. it has the disc brake conversion in the front ect ect. lmk what you all think about this one. I will post more pix as I get more done. I hope you all like it and this is me.

05-11-2014, 08:24 PM	#2
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: driveshaft info 350/th400 Get the engine and trans in and set and bolted to the mounts. Put the slip yoke in all the way and pull it out an inch. Measure the shaft length and get one made. The 12 bolt and the 400 use two different sizes of u-joints. Rear is a 1310 and a 400 is a 1350. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

05-12-2014, 02:21 PM	#3
mookandairin Registered User Join Date: May 2014 Location: Germantown Posts: 58	Re: driveshaft info 350/th400 thanks for the info jimmy. That info will go to good use you can bet on it.thanks again.

05-12-2014, 02:53 PM	#4
66BigBackWindow Registered User Join Date: Apr 2014 Location: Panama NE Posts: 78	Re: driveshaft info 350/th400 I have a 66 with a th400 that was never mounted. The motor mounts need to be moved back as well because it had a series of big blocks in it. I am sure that I will need to do some calculations there was well.

05-13-2014, 11:59 AM	#5
mookandairin Registered User Join Date: May 2014 Location: Germantown Posts: 58	Re: driveshaft info 350/th400 lmk what you find out as I will do the same. good luck and God Speed my friend.



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