10 to 12 bolt...what u joint do i need? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

low 84 · 08-03-2004, 08:24 PM

i'm swaping my 10 bolt out with a 12 bolt this weekend. what u joint do i need that will work with the driveshaft i have now and the 12 bolt pinion?

thanks

gchemist · 08-03-2004, 08:49 PM

Spicer 372. This ujoint has held up better than two other replacements. I like it.

Destructo · 08-03-2004, 09:19 PM

I went to carquest and picked one up, no trouble from it yet, but it hasn't been in there very long, maybe 7 months or so. Been through hell though, VERY dusty gravel roads, off-roading, and a few thousand miles. But the Dana/spicer joints are the best and the strongest.

low 84 · 08-03-2004, 10:34 PM

thanks G. do most parts chains carry the spicer joints?

ocbaud · 08-03-2004, 11:06 PM

whats in the 12bolt again? i dont feel like searching. what gears did you decide on?

Jonboy · 08-03-2004, 11:16 PM

When I used the 10 bolt driveshaft from the 82 Blazer in my 77 equipped with a 12 bolt, I had to use a combination joint from NAPA. Amazingly, the 12 bolt had smaller caps and cross than the 10 bolt driveshaft u-joint.

low 84 · 08-03-2004, 11:54 PM

Quote:

Originally Posted by Jonboy

When I used the 10 bolt driveshaft from the 82 Blazer in my 77 equipped with a 12 bolt, I had to use a combination joint from NAPA. Amazingly, the 12 bolt had smaller caps and cross than the 10 bolt driveshaft u-joint.

the joint G listed is a conversion joint. he has swapped to a 12 bolt as well.

eric, i went with 3.73 richmonds and a powertrax lock right locker. dropped the rearend off at the shop tonight to have the gears set up, should be done on thurs or fri, gonna put the rear end in on sunday

ocbaud · 08-04-2004, 12:00 AM

damn you. always 1 step ahead of me

why did you choose the powertrax over anything else? i'm thinking of going with an eaton and 3.73's

low 84 · 08-04-2004, 12:12 AM

Quote:

Originally Posted by ocbaud

damn you. always 1 step ahead of me

why did you choose the powertrax over anything else? i'm thinking of going with an eaton and 3.73's

basically i got a good deal on it and i liked the idea of going with a locker. as long as i'm accelerating the axles are fully locked together. no clutches to slip or wear out. i'm not saying that would happen with an eaton but i got a good deal on it so i decided to use it.

low 84 · 08-04-2004, 12:14 AM

and as far as being 1 step ahead of you, i had this 12 bolt for 1 1/2 years just be sitting in the garage wait for me to get the money to build it

gchemist · 08-04-2004, 02:58 AM

NAPA has the joints in stock. Not sure about other stores. They can probably order them though.

jimfulco · 08-04-2004, 03:08 AM

My NAPA guy didn't have one in stock, so he made one from 2 others, & only charged me for one.

*1972C10* · 08-04-2004, 04:09 AM

Presicion part # 447

Grim Reaper · 08-04-2004, 01:58 PM

You got the 10bolt...swap the yokes. It takes a different seal but they are readily available. bring both the 10 and 12's seal. They need to get the numbers off each and then they can cross refference it. The 10 uses a stronger u-joint. Go to NAPA. Autozone people are too stupid to do this.

**swervin ervin** · 08-04-2004, 04:07 PM

Quote:

Originally Posted by Grim Reaper

Go to NAPA. Autozone people are too stupid to do this.

Shame on you. Now what in the world makes you say such things?

Grim Reaper · 08-04-2004, 05:44 PM

Quote:

Originally Posted by swervin ervin

Shame on you. Now what in the world makes you say such things?

The zit face honda driving punk that told me a 297 U-joint for a front axle U-joint on a 1979 K5 was a dealer only part.

08-03-2004, 08:24 PM	#1
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	10 to 12 bolt...what u joint do i need? i'm swaping my 10 bolt out with a 12 bolt this weekend. what u joint do i need that will work with the driveshaft i have now and the 12 bolt pinion? thanks __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

08-03-2004, 08:49 PM	#2
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Spicer 372. This ujoint has held up better than two other replacements. I like it. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

08-03-2004, 09:19 PM	#3
Destructo Registered User Join Date: Sep 2003 Location: Lewisville, NC Posts: 1,836	I went to carquest and picked one up, no trouble from it yet, but it hasn't been in there very long, maybe 7 months or so. Been through hell though, VERY dusty gravel roads, off-roading, and a few thousand miles. But the Dana/spicer joints are the best and the strongest. __________________ 1985 Scottsdale Shortbed 4x4 Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch. 2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle.

08-03-2004, 10:34 PM	#4
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	thanks G. do most parts chains carry the spicer joints? __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

08-03-2004, 11:16 PM	#6
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	When I used the 10 bolt driveshaft from the 82 Blazer in my 77 equipped with a 12 bolt, I had to use a combination joint from NAPA. Amazingly, the 12 bolt had smaller caps and cross than the 10 bolt driveshaft u-joint. __________________ 1974 Jimmy- 5.3/4L80e/NP241

08-03-2004, 11:06 PM	#5
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	whats in the 12bolt again? i dont feel like searching. what gears did you decide on?

08-04-2004, 12:00 AM	#8
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	damn you. always 1 step ahead of me why did you choose the powertrax over anything else? i'm thinking of going with an eaton and 3.73's

08-04-2004, 12:14 AM	#10
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	and as far as being 1 step ahead of you, i had this 12 bolt for 1 1/2 years just be sitting in the garage wait for me to get the money to build it __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

08-04-2004, 02:58 AM	#11
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	NAPA has the joints in stock. Not sure about other stores. They can probably order them though. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

08-04-2004, 03:08 AM	#12
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	My NAPA guy didn't have one in stock, so he made one from 2 others, & only charged me for one.

08-04-2004, 04:09 AM	#13
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	Presicion part # 447

08-04-2004, 01:58 PM	#14
Grim Reaper Registered User Join Date: Jul 2001 Location: Atlanta GA Posts: 1,704	You got the 10bolt...swap the yokes. It takes a different seal but they are readily available. bring both the 10 and 12's seal. They need to get the numbers off each and then they can cross refference it. The 10 uses a stronger u-joint. Go to NAPA. Autozone people are too stupid to do this. __________________ Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project

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