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10-17-2016, 05:19 PM
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#1 |
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Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,178
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Broken Pinion Gear
Well this weekend the pinion gear went in my 70. It was a 373 and has a posi.
It would be great to find a used set of 373 gears or even better a 3 series posi and a set of 308 gears to go with the turbo 350 and 30" tires. Anyone have experience with this swap and the change it made towards drive-ability on the freeway vs off the line? Anyone have a gear set / posi laying around they want to part with? Thanks in advance for your help. I saw a great write-up on the site on how to do the replacement and setup. I've never done one, but it gave me the confidence to do it myself.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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10-17-2016, 08:00 PM
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#2 |
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Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: Broken Pinion Gear
What axle do you have? That will help people determine if they have what you need. If you have a 14bolt full-floating rear with 10.5" ring gear, I have what you need. But you probably have something closer to stock.
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10-18-2016, 11:24 AM
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#3 |
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Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,178
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Re: Broken Pinion Gear
Oops, I thought I added that. I have a 12 bolt. I found a guy that has a beautiful 3.08 open rear end with ring and pinion and he wants little for it. It is out of a 1980.
He switched ratio because he went with a ls and 4l80 and 3.08 was silver state run speeds in OD. Will this 1980 12-bolt diff unit fit in my 1970 12-bolt diff unit? Of course I will buy all the bearings and shims for my 1970 model unit.
__________________
"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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10-18-2016, 08:43 PM
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#4 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,728
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Re: Broken Pinion Gear
It will fit. Bearings and other parts should be the same from the two.
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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 |
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10-19-2016, 10:37 AM
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#5 | |
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Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,178
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Re: Broken Pinion Gear
Quote:
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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10-19-2016, 11:08 AM
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#6 |
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Still Learning
Join Date: Jul 2009
Location: Central Oklahoma
Posts: 10,108
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Re: Broken Pinion Gear
I'm sure someone on here has what you need for your truck. You can pay a small fee, HERE and post a wtb ad in the parts section.
If I had a set, I'd send them to you. The only extra set I have is 2:72, not a good fit for you. What transmission do you have? |
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