CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: HustleRussell on November 22, 2016, 02:04:01 AM

Title: MC1 Maincase Casting Number
Post by: HustleRussell on November 22, 2016, 02:04:01 AM

CRG lists the MC1 main case casting # 3911940 in the transmission section. My # is 3911982.

http://www.camaros.org/trans.shtml

Title: Re: MC1 Maincase Casting Number
Post by: HustleRussell on November 22, 2016, 02:10:10 AM

Maybe John could chime in?

Title: Re: MC1 Maincase Casting Number
Post by: 69Z28-RS on November 22, 2016, 03:35:48 AM

Isn't that a '70 model year case?   cast date:  A 29 0   

Title: Re: MC1 Maincase Casting Number
Post by: cook_dw on November 22, 2016, 01:30:08 PM

Quote from: 69Z28-RS on November 22, 2016, 03:35:48 AM

Isn't that a '70 model year case?   cast date:  A 29 0   

Yes

Title: Re: MC1 Maincase Casting Number
Post by: bertfam on November 22, 2016, 02:27:35 PM

Quote

Isn't that a '70 model year case?

No. If you blow it up you can see it's a funky 9 (see top picture attached). You can also make out the partial VIN of 19N, but even if it were a 0 for 1970, that same main case casting number (3911940) was used for the MC1.

A Google search turned up one other MC1 with a 3911982 main case (see bottom picture attached). It was dated C-17-8 or C-17-9 (The owner said it was an 8, but it's difficult to tell since the last digit is also funky!)

It appears there may have been more than one main case casting number used for the MC1.

Ed

Title: Re: MC1 Maincase Casting Number
Post by: cook_dw on November 22, 2016, 02:50:21 PM

Ed your eyes are better than mine..

Title: Re: MC1 Maincase Casting Number
Post by: bertfam on November 22, 2016, 03:13:50 PM

Quote

Ed your eyes are better than mine..

No, not really. But after looking at funky 6's, funky 8's and funky 9's over the last 50 years, you get to recognize (USUALLY) what they look like!

Ed

Title: Re: MC1 Maincase Casting Number
Post by: KurtS on November 23, 2016, 01:48:56 AM

I found another one - dated B259.

Thanks Russ, I updated that page.

Title: Re: MC1 Maincase Casting Number
Post by: JKZ27 on November 23, 2016, 02:26:40 AM

Sorry, I'm late to the party. Mine is the same.

Title: Re: MC1 Maincase Casting Number
Post by: HustleRussell on November 26, 2016, 11:38:40 PM

Hi Kurt. We might be on two different pages? This page still only list 3911940?

http://www.camaros.org/trans.shtml

Title: Re: MC1 Maincase Casting Number
Post by: KurtS on November 27, 2016, 01:26:24 AM

Yup, I did a different page. http://www.camaros.org/drivetrain.shtml#trans
I'll fix the trans page asap.

Title: Re: MC1 Maincase Casting Number
Post by: HustleRussell on November 27, 2016, 01:26:52 AM

I think you changed the page for the side cover?

http://www.camaros.org/drivetrain.shtml

Title: Re: MC1 Maincase Casting Number
Post by: HustleRussell on November 27, 2016, 01:29:23 AM

My sidecover is 3911947.

Title: Re: MC1 Maincase Casting Number
Post by: KurtS on November 27, 2016, 01:32:08 AM

Quote from: 1969Z27 on November 27, 2016, 01:26:52 AM

I think you changed the page for the side cover?

http://www.camaros.org/drivetrain.shtml

No, I didn't only changed that page I linked to above.

Title: Re: MC1 Maincase Casting Number
Post by: VINCE Z28 on November 27, 2016, 07:45:27 PM

Another interesting side note, CBTN page 289 shows MC1 as having same case numbers ( 3911940 ) but different internal gear ratios, with 1969 Chevelle only having 1st 3.03:1, 2nd 1.75:1, 3rd Direct , Reverse 3.02:1.

Title: Re: MC1 Maincase Casting Number
Post by: KurtS on November 28, 2016, 08:58:21 PM

I updated the trans page.