Crown & Pinion

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Apr 27, 2009 | 04:02 AM

shmoky

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Melting Slicks

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From: Chetwynd B.C.

Crown & Pinion

Not sure if this should be here or in General but it is technical. Mods can move if necessary.

I have come across a set of rear end gears but don't know if they will fit in my 68. My present rear diff has 3:70's and want to know if the following will fit.

They are US Gears the Crown has 42 teeth and the Pinion has 13. That makes it a 3:23 doesn't it? They came out of an Eaton Posi Diff. Couldn't find any #'s on them but the box had written on it: WJG9F350 and C90Z4209A. Don't know if these are the #'s for these pieces or the ones they replaced.

Will these fit into my stock diff?

shmoky

Apr 27, 2009 | 08:03 AM

Ganey

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From: CORVETTE 77 385 C.I. TEXAS

Quote:

Originally Posted by shmoky

They are US Gears the Crown has 42 teeth and the Pinion has 13. That makes it a 3:23 doesn't it?

shmoky

Yes, Ring/Pinion 42/13=3.23.

There was not a factory Corvette 68-79 3.23 ratio.

Apr 27, 2009 | 11:26 AM

shmoky

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Melting Slicks

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From: Chetwynd B.C.

Quote:

Originally Posted by Ganey

Yes, Ring/Pinion 42/13=3.23.

There was not a factory Corvette 68-79 3.23 ratio.

Thanx Ganey, I was pretty sure there was no 3.23 back then but will THESE gears fit into my rear diff? I'm not sure if I am even going to USE these gears; (another post later) I just want to know if they will fit.

shmoky

Apr 27, 2009 | 11:50 AM

63mako

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From: Millington Illinois

St. Jude Donor '08-'09

C90Z4209A cross references to US gear ford 9"

Apr 27, 2009 | 11:56 AM

shmoky

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Melting Slicks

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From: Chetwynd B.C.

Quote:

Originally Posted by 63mako

C90Z4209A cross references to US gear ford 9"

Thanx Kevin, I knew someone would have a cross reference for the #. So the guys car (71 camaro) had a ford 9" in it? AND it won't fit into my rear diff right?

shmoky

Apr 27, 2009 | 12:31 PM

GTR1999

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From: Connecticut, USA

corvette gears are specific- no other application

Apr 27, 2009 | 12:46 PM

shmoky

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Melting Slicks

Joined: Mar 2005

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From: Chetwynd B.C.

Quote:

Originally Posted by GTR1999

corvette gears are specific- no other application

Okay problem solved.

I love this forum. Had info and answer within 9.5 hrs. Even though it the thread was started at 1:00 a.m.

shmoky

Apr 27, 2009 | 12:58 PM

Ganey

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From: CORVETTE 77 385 C.I. TEXAS

Quote:

Originally Posted by shmoky

So the guys car (71 camaro) had a ford 9" in it? AND it won't fit into my rear diff right?

shmoky

The Camaro did not come w/ Ford 9" however that's a strong rear end that is used to replace weaker rear ends for drag racing & the stock gears like 3.23 would be discarded. Right.

Yes, Corvette gears are specific & you should be leary of unknowns selling "Corvette" gears.