14 bolt 373 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Stokester · 10-19-2015, 08:36 PM

Well I picked up a 14 bolt 373 (SF 6 lug) from a pull a part yesterday. Pulled diff cover and found some very small shavings. Had more play than the 12 bolt that I am replacing. Rear end is out of a 88 truck. Not sure of miles had no speedo. I pulled it out thinking I would find some bearings that were shot. No such luck. All bearings look good. Reason I am replacing axle is my 12 bolt is axle tube was broke off (PO) pumpkin and welded back wrong.
1. Can someone tell me if the gears are shot.
2, wrong shims?
3. What needs to be replaced (kit, part #)
4. My 12 bolt yoke won't fit on the 14 bolt. I have read that the 10 bolt yoke will. Or just get conversion joint?
5. The off center pumpkin issue of the semi float 9.5. 1" or so off center.

Only gave $100 for the 14 bolt rear end. Try and put it back together or look for another? How hard is it to set up the gears correctly?

72 blazer 700trans 4"lift w35's 350sb
Any advise will be greatly appreciated...
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Stokester · 10-19-2015, 08:41 PM

Quote:

Originally Posted by Stokester

Well I picked up a 14 bolt 373 (SF 6 lug) from a pull a part yesterday. Pulled diff cover and found some very small shavings. Had more play than the 12 bolt that I am replacing. Rear end is out of a 88 truck. Not sure of miles had no speedo. I pulled it out thinking I would find some bearings that were shot. No such luck. All bearings look good. Reason I am replacing axle is my 12 bolt is axle tube was broke off (PO) pumpkin and welded back wrong.
1. Can someone tell me if the gears are shot.
2, wrong shims?
3. What needs to be replaced (kit, part #)
4. My 12 bolt yoke won't fit on the 14 bolt. I have read that the 10 bolt yoke will. Or just get conversion joint?
5. The off center pumpkin issue of the semi float 9.5. 1" or so off center.

Only gave $100 for the 14 bolt rear end. Try and put it back together or look for another? How hard is it to set up the gears correctly?

72 blazer 700trans 4"lift w35's 350sb
Any advise will be greatly appreciated...
Posted via Mobile Device

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**GMC-YA68** · 10-19-2015, 08:45 PM

Any "used" axle I'd expect the worst and plan on rebuilding everything. Then hopefully work backwards from there. The spider gears in yours are trash. I am assuming the ring gear may look the same??

Stokester · 10-19-2015, 08:51 PM

Quote:

Originally Posted by GMC-YA68

Any "used" axle I'd expect the worst and plan on rebuilding everything. Then hopefully work backwards from there. The spider gears in yours are trash. I am assuming the ring gear may look the same??

The ring gear looks really good as well as pinion gear. The spider gears look like hell. Not sure what kits I need to get to rebuild or if this is something I need to send out and have done?
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Stokester · 10-19-2015, 08:52 PM

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Mike C · 10-20-2015, 08:40 AM

I'd consider putting a LockRight in it. You can do that work yourself. By it's nature, it puts more lash in the drivetrain, but it's not noticeable in practice.

**GMC-YA68** · 10-21-2015, 12:43 AM

I have a 12 bolt but I bought everything I needed from Yukon Gear. I replaced everything. Bought everything and had a 4x4 do it all. I just dropped the axle off.

72k5ls · 10-21-2015, 09:56 PM

You can buy the spider gears at a drivetrain shop in houston. The r&p look good I would probably install new bearings and spider gears if you are just going to be driving it on the street. Bearing kit about $150 and spider gears $130.

Stokester · 10-22-2015, 12:41 PM

Quote:

Originally Posted by 72k5ls

You can buy the spider gears at a drivetrain shop in houston. The r&p look good I would probably install new bearings and spider gears if you are just going to be driving it on the street. Bearing kit about $150 and spider gears $130.

Thanks 72k5ls
I was a bit uneasy about doing gears and seals. From what I read it is easy but something that I could mess up pretty easy.. I took back the 14 bolt and am still looking.. Thanks for all the help guys!
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72k5ls · 10-22-2015, 08:44 PM

I see lots of the 14 semi floaters at the pnp in san antonio that is a good place to find one I always make a trip there when I go down to visit family. Look for a heavy half ton truck they used the 14 bolt semi floater 6 lugger also not normally used as hard as the 4wd and 3/4 trucks.

10-19-2015, 08:36 PM	#1
Stokester Registered User Join Date: Apr 2015 Location: Katy Texas Posts: 69	14 bolt 373 Well I picked up a 14 bolt 373 (SF 6 lug) from a pull a part yesterday. Pulled diff cover and found some very small shavings. Had more play than the 12 bolt that I am replacing. Rear end is out of a 88 truck. Not sure of miles had no speedo. I pulled it out thinking I would find some bearings that were shot. No such luck. All bearings look good. Reason I am replacing axle is my 12 bolt is axle tube was broke off (PO) pumpkin and welded back wrong. 1. Can someone tell me if the gears are shot. 2, wrong shims? 3. What needs to be replaced (kit, part #) 4. My 12 bolt yoke won't fit on the 14 bolt. I have read that the 10 bolt yoke will. Or just get conversion joint? 5. The off center pumpkin issue of the semi float 9.5. 1" or so off center. Only gave $100 for the 14 bolt rear end. Try and put it back together or look for another? How hard is it to set up the gears correctly? 72 blazer 700trans 4"lift w35's 350sb Any advise will be greatly appreciated... Posted via Mobile Device Attached Images

10-19-2015, 08:45 PM	#3
GMC-YA68 Senior Member Join Date: Mar 2004 Location: Lee's Summit, MO (KC) Posts: 742	Re: 14 bolt 373 Any "used" axle I'd expect the worst and plan on rebuilding everything. Then hopefully work backwards from there. The spider gears in yours are trash. I am assuming the ring gear may look the same?? __________________ -Keegan- '72 Jimmy 4x4 - 5.3/4L65E/NP205 swap http://67-72chevytrucks.com/vboard/s...d.php?t=663780

10-20-2015, 08:40 AM	#6
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	Re: 14 bolt 373 I'd consider putting a LockRight in it. You can do that work yourself. By it's nature, it puts more lash in the drivetrain, but it's not noticeable in practice. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

10-21-2015, 12:43 AM	#7
GMC-YA68 Senior Member Join Date: Mar 2004 Location: Lee's Summit, MO (KC) Posts: 742	Re: 14 bolt 373 I have a 12 bolt but I bought everything I needed from Yukon Gear. I replaced everything. Bought everything and had a 4x4 do it all. I just dropped the axle off. __________________ -Keegan- '72 Jimmy 4x4 - 5.3/4L65E/NP205 swap http://67-72chevytrucks.com/vboard/s...d.php?t=663780

10-21-2015, 09:56 PM	#8
72k5ls Registered User Join Date: Oct 2015 Location: Conroe,TX Posts: 63	Re: 14 bolt 373 You can buy the spider gears at a drivetrain shop in houston. The r&p look good I would probably install new bearings and spider gears if you are just going to be driving it on the street. Bearing kit about $150 and spider gears $130. Last edited by 72k5ls; 10-21-2015 at 10:03 PM.

10-19-2015, 08:52 PM	#5
Stokester Registered User Join Date: Apr 2015 Location: Katy Texas Posts: 69	Posted via Mobile Device Posted via Mobile Device

10-22-2015, 08:44 PM	#10
72k5ls Registered User Join Date: Oct 2015 Location: Conroe,TX Posts: 63	Re: 14 bolt 373 I see lots of the 14 semi floaters at the pnp in san antonio that is a good place to find one I always make a trip there when I go down to visit family. Look for a heavy half ton truck they used the 14 bolt semi floater 6 lugger also not normally used as hard as the 4wd and 3/4 trucks.



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