Diff and gearbox numbers

[GPJ80]

Hi there , trying to determine what diff and gearbox i have in my 1970 , The diff numbers are 1CA04 20 70 W and was wondering if anyone knows where the numbers can be found on the 4-speed gearbox , Its probally just the standard M21

[jolinari]

Originally posted by GPJ80
Hi there , trying to determine what diff and gearbox i have in my 1970 , The diff numbers are 1CA04 20 70 W and was wondering if anyone knows where the numbers can be found on the 4-speed gearbox , Its probally just the standard M21

Do u have  a letter missing after the CA? Can you comfirm the above numbers?

Have you got the protecto plate of the vehicle?

[jolinari]

Originally posted by GPJ80
Hi there , trying to determine what diff and gearbox i have in my 1970 , The diff numbers are 1CA04 20 70 W

 If the "0" is actually an "O" and not any other character, then what you have is a 3.70:1 positraction axle originally used with a 350 cid engine. That means the engine would have to be an L-46 or an LT-1

Originally posted by GPJ80
if anyone knows where the numbers can be found on the 4-speed gearbox , Its probally just the standard M21

The transmission production code and VIN derivative will be found stamped vertically on the right side (passenger side) of the MAIN CASE just forward of where the extension housing/ rear bearing retainer plate attaches. The production code will begin with a "P" and will end with an "A", "B", or "C".

A= 2.56:1 wide ratio (M-20)
B= 2.20:1 close ratio (M-21)
C= 2.20:1 HD close ratio (M-22)



NCRS SOURCE

[GPJ80]

Yeah not sure , the numbers on the diff are how i have seen them , Its hard to see whether or not its  a O or a 0 because all the O are the same size and shape , Whats the protecto plate , And the gearbox number i checked it , its POE04B . How can i find out what motor it came out with because i know now that the 350 that is in it is a CKW motor out of 72 model but has had LT1 Spec done to it

[jolinari]

Originally posted by GPJ80
 Whats the protecto plate?

The Protect-O-Plate was furnished with all chevrolet cars (65-72)and was a metal plate imprinted at the assembly plant. The plate contained information on various standard or optional equipment. You may determine from the imprinted information on the plate the type of engine, transmission, rear axle, exterior color, the month the vehicle was produced, and other basic vehicle information.
Note: This plate was included with the warranty book and was not attached to the car.

[jolinari]

Originally posted by GPJ80
How can i find out what motor it came out with because i know now that the 350 that is in it is a CKW motor out of 72 model but has had LT1 Spec done to it

Whats your VIN number?

[GPJ80]

No i dont have the protect o plate , didnt know about that , I know they got info on top of the fuel tank but have not check it yet , probally have to drop the fuel tank , The VIN number is 194370S412218

[jolinari]

Originally posted by GPJ80
No i dont have the protect o plate , didnt know about that , I know they got info on top of the fuel tank but have not check it yet , probally have to drop the fuel tank , The VIN number is 194370S412218

mate i am afraid the only way you are going to tell what engine was in it is by the Protect-O-Plate...unfortunatley Vin numbers for 1970 does not identify the engine...

Convertible Serial numbers ranged from 194670S100001 to 194670S117316
Coupe Serial numbers ranged from 194370S100001 to 194670S117316

Position Character Description  
1 1 Chevrolet Division  
2 9 body series: Corvette  
3 4 type of engine: V-8  
4 & 5 67 convertible  
37 coupe  
6 0 1970  
7 S Assembled in St. Louis, MO  
8 to 13 100001 to 128566 production sequence

[GPJ80]

Does the paperwork on top of the fuel tank tell me anything about engine and so on , But dont like my chances of it still being there , You would think someone would keep records of these cars hey , Oh well . I wonder if i can contact them in the USA and see if they can give me anything .

[jolinari]

Originally posted by jolinari

Originally posted by GPJ80
 Whats the protecto plate?

The Protect-O-Plate was furnished with all chevrolet cars (65-72)and was a metal plate imprinted at the assembly plant. The plate contained information on various standard or optional equipment. You may determine from the imprinted information on the plate the type of engine, transmission, rear axle, exterior color, the month the vehicle was produced, and other basic vehicle information.
Note: This plate was included with the warranty book and was not attached to the car.

this is mine, it is like credit card size...

[jolinari]

Originally posted by GPJ80
Does the paperwork on top of the fuel tank tell me anything about engine and so on , But dont like my chances of it still being there , You would think someone would keep records of these cars hey , Oh well . I wonder if i can contact them in the USA and see if they can give me anything .

I dont think it would tell you anything dude unless it had an option engine...and good luck trying to locate these informations


this is an exmple (mine)



tells you the colour of the trim
radio option
power steering
etc...

[Cameron 77C3]

Nice work Joe. ;42

Might have a little project for you for info to put in our mag and on our web site.  I'll give ya a buzz over the weekend. ;35

[jolinari]

Originally posted by Cameron 77C3
Nice work Joe. ;42

Might have a little project for you for info to put in our mag and on our web site.  I'll give ya a buzz over the weekend. ;35

No worries Cam...If I could help please let me know