th400 yoke conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ratfreak8871 · 05-18-2019, 03:04 PM

can I take my fixed yoke and counter bore it to convert to one piece driveshaft? Surely someone has done this.

**mongocanfly** · 05-18-2019, 03:14 PM

Im not following what your asking...what are you trying to accomplish?

Big Daddy Bear · 05-18-2019, 04:00 PM

I did several years ago on a 4WD to 2WD Blazer conversion. I used a 350/TH400 from a 2WD Suburban that had the 2-piece driveshaft.

I had a buddy who was a machinist turn the inside splines down to allow the yoke to slip on far enough to clear the shaft. I also just cut the longer driveshaft down and welded the Suburban yoke end of the shaft on to the temp one.

Was not worried about balance at the time as I was doing it as a temp to be able to move it around while being built. The end goal was a new driveshaft cut specific to length to fit the Blazer.

At the time, there was also a conversion yoke being sold already set-up with the proper clearance, but I can't remember the specifics...

**JDL** · 05-18-2019, 04:01 PM

You can but you would hove to seal the hole that the bolt goes thru that keeps it in place on the trans. I think it would be easier to get one that is already set up to slide in and out for a one peace drive shaft.

Big Daddy Bear · 05-18-2019, 04:19 PM

Quote:

Originally Posted by JDL

You can but you would hove to seal the hole that the bolt goes thru that keeps it in place on the trans. I think it would be easier to get one that is already set up to slide in and out for a one peace drive shaft.

Can be done, just have to balance cost of machine work/threading if you have to pay for it vs cost of the new yoke...

05-18-2019, 03:04 PM	#1
ratfreak8871 Registered User Join Date: May 2007 Location: ALTON, IL. Posts: 98	th400 yoke conversion can I take my fixed yoke and counter bore it to convert to one piece driveshaft? Surely someone has done this.

05-18-2019, 03:14 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,579	Re: th400 yoke conversion Im not following what your asking...what are you trying to accomplish? __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

05-18-2019, 04:00 PM	#3
Big Daddy Bear Registered User Join Date: Jan 2015 Location: Rochester, WA Posts: 259	Re: th400 yoke conversion I did several years ago on a 4WD to 2WD Blazer conversion. I used a 350/TH400 from a 2WD Suburban that had the 2-piece driveshaft. I had a buddy who was a machinist turn the inside splines down to allow the yoke to slip on far enough to clear the shaft. I also just cut the longer driveshaft down and welded the Suburban yoke end of the shaft on to the temp one. Was not worried about balance at the time as I was doing it as a temp to be able to move it around while being built. The end goal was a new driveshaft cut specific to length to fit the Blazer. At the time, there was also a conversion yoke being sold already set-up with the proper clearance, but I can't remember the specifics... __________________ No bolt or nut in the world will remain tight if you turn it to liquid!!!

05-18-2019, 04:01 PM	#4
JDL Senior Member Join Date: Sep 2000 Location: Agency IA. Posts: 1,838	Re: th400 yoke conversion You can but you would hove to seal the hole that the bolt goes thru that keeps it in place on the trans. I think it would be easier to get one that is already set up to slide in and out for a one peace drive shaft. __________________ 72 Chevy short step side with 454 air and tilt. 72 nova project car 63 chevy II drag car Agency Iowa



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