Need a new rear yoke... Help please!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

elks · 03-29-2012, 12:46 PM

So I am starting to go through rear straps on my 1972 chevy blazer. I know the rear is a 12 bolt, but I am wanting to upgrade from straps to u-bolt style. Local part houses, are of no help so I need to order online.

I need to know how many splines the pinyon shafts are. Also I know factory it came with a 1310 ujoint. Right now I have a 1 ton tom woods driveline. But am using a crossover rear ujoint. If I can I would like to take that ujoint to a full 1350. So anyone know what I need to get inorder to get away from straps and go to a 1350 ujoint?

My biggest hang up right now is the spline count.

Also I am aware that the set up uses a crush sleeve and what I need to do there...

Thanks a ton.

Ackattack · 03-29-2012, 01:00 PM

I got mine off of ebay. It was a spicer unit (don't have the P/N with me) but I found this one as well

http://www.ebay.com/itm/12-Bolt-Chev...ht_1368wt_1222

elks · 03-29-2012, 02:18 PM

So it is 30 spline. Also what size is the pinyon nut? Socket size? Do they have a kit with a new pinyon nut included?

Would this one work even though it says its for a car?

http://www.ebay.com/itm/64-72-Chevy-...e3b33d&vxp=mtr

Ackattack · 03-29-2012, 02:37 PM

My kit came with the nut and washer as well. It may have even come with a new crush sleeve, I can't remember cause I rebuilt the whole rearend. I'd just message them and ask.

I've had different size pinion nuts in the range of 1-1/16 to 1-1/4.

BB72CHEVKT · 03-29-2012, 02:41 PM

I got mine from a driveshaft place.

mmmBoost · 03-29-2012, 06:38 PM

I bought Moroso U Joint Girdles from Summit racing after I blew the caps off my rear yoke, sheering off the cap retainer nubs. Never had a problem since. and for $30 I couldn't beat it. I'll take a pic when I get home. Here's a link
http://www.summitracing.com/search/?...0girdles&dds=1

mmmBoost · 03-29-2012, 06:40 PM

They're super easy to install and you don't have to remove the yoke

elks · 03-29-2012, 09:21 PM

I think part of my failure issue is front the yoke being wore out a touch. Is the pinion for the car same as the truck/blazer?

If so this should work...
http://www.ebay.com/itm/64-72-Chevy-...e3b33d&vxp=mtr

mmmBoost · 03-30-2012, 03:36 PM

Here'sthe pics of mine. Here you can see where the tab broke off mine.
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I've had mine on for 11 yrs but spent 8 yrs sitting
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68shortfleet · 03-30-2012, 04:34 PM

I am also in need of this 1350 yoke for a 12 bolt.

Did GM use this on any factory applications?

03-29-2012, 12:46 PM	#1
elks Registered User Join Date: Mar 2009 Location: NW, Colorado Posts: 285	Need a new rear yoke... Help please!!! So I am starting to go through rear straps on my 1972 chevy blazer. I know the rear is a 12 bolt, but I am wanting to upgrade from straps to u-bolt style. Local part houses, are of no help so I need to order online. I need to know how many splines the pinyon shafts are. Also I know factory it came with a 1310 ujoint. Right now I have a 1 ton tom woods driveline. But am using a crossover rear ujoint. If I can I would like to take that ujoint to a full 1350. So anyone know what I need to get inorder to get away from straps and go to a 1350 ujoint? My biggest hang up right now is the spline count. Also I am aware that the set up uses a crush sleeve and what I need to do there... Thanks a ton. __________________ Confidence is the feeling we have before we fully comprehend the situation

03-29-2012, 01:00 PM	#2
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: Need a new rear yoke... Help please!!! I got mine off of ebay. It was a spicer unit (don't have the P/N with me) but I found this one as well http://www.ebay.com/itm/12-Bolt-Chev...ht_1368wt_1222 __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

03-29-2012, 02:18 PM	#3
elks Registered User Join Date: Mar 2009 Location: NW, Colorado Posts: 285	Re: Need a new rear yoke... Help please!!! So it is 30 spline. Also what size is the pinyon nut? Socket size? Do they have a kit with a new pinyon nut included? Would this one work even though it says its for a car? http://www.ebay.com/itm/64-72-Chevy-...e3b33d&vxp=mtr __________________ Confidence is the feeling we have before we fully comprehend the situation

03-29-2012, 02:37 PM	#4
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: Need a new rear yoke... Help please!!! My kit came with the nut and washer as well. It may have even come with a new crush sleeve, I can't remember cause I rebuilt the whole rearend. I'd just message them and ask. I've had different size pinion nuts in the range of 1-1/16 to 1-1/4. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

03-29-2012, 02:41 PM	#5
BB72CHEVKT Junior Member Join Date: Mar 2007 Location: Hideaway, TX Posts: 4,950	Re: Need a new rear yoke... Help please!!! I got mine from a driveshaft place. __________________ 71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400

03-29-2012, 06:38 PM	#6
mmmBoost Registered User Join Date: Jan 2011 Location: Wisconsin Posts: 224	Re: Need a new rear yoke... Help please!!! I bought Moroso U Joint Girdles from Summit racing after I blew the caps off my rear yoke, sheering off the cap retainer nubs. Never had a problem since. and for $30 I couldn't beat it. I'll take a pic when I get home. Here's a link http://www.summitracing.com/search/?...0girdles&dds=1 __________________ Always remember those that had your back Never forget those that turned it Demon 68- C20 (conv. 5 lug) 406sb, TH400, 12 Bolt, Red Slut 09- 1500 Crew Cab Z71, 2.5" Lift, Comp Cam, Deleted AFM/DoD, Diablo tuner

03-29-2012, 06:40 PM	#7
mmmBoost Registered User Join Date: Jan 2011 Location: Wisconsin Posts: 224	Re: Need a new rear yoke... Help please!!! They're super easy to install and you don't have to remove the yoke __________________ Always remember those that had your back Never forget those that turned it Demon 68- C20 (conv. 5 lug) 406sb, TH400, 12 Bolt, Red Slut 09- 1500 Crew Cab Z71, 2.5" Lift, Comp Cam, Deleted AFM/DoD, Diablo tuner

03-29-2012, 09:21 PM	#8
elks Registered User Join Date: Mar 2009 Location: NW, Colorado Posts: 285	Re: Need a new rear yoke... Help please!!! I think part of my failure issue is front the yoke being wore out a touch. Is the pinion for the car same as the truck/blazer? If so this should work... http://www.ebay.com/itm/64-72-Chevy-...e3b33d&vxp=mtr __________________ Confidence is the feeling we have before we fully comprehend the situation

03-30-2012, 03:36 PM	#9
mmmBoost Registered User Join Date: Jan 2011 Location: Wisconsin Posts: 224	Re: Need a new rear yoke... Help please!!! Here'sthe pics of mine. Here you can see where the tab broke off mine. I've had mine on for 11 yrs but spent 8 yrs sitting __________________ Always remember those that had your back Never forget those that turned it Demon 68- C20 (conv. 5 lug) 406sb, TH400, 12 Bolt, Red Slut 09- 1500 Crew Cab Z71, 2.5" Lift, Comp Cam, Deleted AFM/DoD, Diablo tuner

03-30-2012, 04:34 PM	#10
68shortfleet Registered User Join Date: Oct 2006 Location: Dundee, Oregon Posts: 311	Re: Need a new rear yoke... Help please!!! I am also in need of this 1350 yoke for a 12 bolt. Did GM use this on any factory applications?



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