Instrument Panel Center Lower Reinforcement: Gm 3980358 for 1970 or 3991984 for 1971-1980 or 378723 for 1981 ???

DCL70

Veteran Member
May 5, 2007
2,106
The South of N.H.
Attached are front and back side photos of the an original Instrument Panel Center Lower Reinforcement. Is it GM # 3980358 used on 1970 models as shown in the 1970 Assembly Manual (UPC 1, Sheet B6)...........or is it 3991784 as shown in the 1971 Assembly Manual (UPC 1, Sheet 1A2B-1) ........or is it 378723 as shown in the 1981 Product Description (UPC 1a2B, Sheet 1) ? According to the 1971 Assembly Manual REVISION RECORD 3991784 "WAS 3980358 REINF" as of 6-2-70.
I had always assumed it was GM 3980358 for a 1970 as I bought it with a lot of other 1970 Camaro parts at a swap meet in Thompson, CT, back in the 1990's.
Dave

Reinforcement, Center Lower - GM 3980358 or GM 3991784 - 1 of 3.jpg Reinforcement, Center Lower - GM 3980358 or GM 3991784 - 2 of 3.jpg Reinforcement, Center Lower - GM 3980358 or GM 3991784 - 3 of 3.jpg
 

Mitch_Z

Member
Mar 31, 2007
201
Detroit, MI
I guess without a stamped part number you will not know. Attached is a picture of my June 1970, note the stamped L. The bolt marking are the same as yours.

IMG_0297(2).JPG
 

DCL70

Veteran Member
May 5, 2007
2,106
The South of N.H.
Mitch,
Thanks for the photo. Does your 3980356 center lower reinforcement have the 2 oblong shaped holes like mine? Obviously the painted black 3984437 REINF. that is attached to the 3980356 reinforcement (UPC 1, Sheet B6.5) with the 2 3840232 screws covers these 2 holes. I don't think the letter "L" means left because the part number ends in an even number. The "L" might signify the manufacturer.
Thanks again,
Dave
 
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DCL70

Veteran Member
May 5, 2007
2,106
The South of N.H.
When there is a left side part and a right side part the left side part has an odd GM part number and the right hand part has an even GM part number.
Below is an example of a LH and RH inner fender braces.

GM 3973981 & 3973982 - 1 of 2.jpg GM 3973981 & 3973982 - 2 of 2.jpg
 
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