Spare Tire J Hook & Wing Nut

[samz]

Year-69
Plant- Norwood
Build Date- 10E
J bolt length- 9.5"
Rear defroster- None
Wing Nut- Serrated/Stamped
Wheel -15 x 7
Wheel code- YH

[DCL70SS]

Attached are 3 photos and my drawing of a 1969 Camaro Coupe J-Bolt & Wingnut, GM # 3949607 & GM # 9785616. The wing nut has 8 "dimples" on the bottom side. This was with a 1969 Camaro bumper jack, 32 1/4"long, stamped "UN" on the jacking mechanism, and dated "9A" (1969, Jan.) on the rivet head that I bought at a salvage yard in Pepperell, MA back in the 1990's. I have many other J-bolts that I am doing research on.
Dave

[DCL70SS]

Attached in the 1st photo is what I believe to be a 1967-1968 Camaro Spare Tire J-bolt that I purchased at a swap meet decades ago based on what I have seen in this "Spare Tire J Hook & Wing Nut" thread.
The overall length measures 7 3/8" long. My question is it for the Coupe or the Convertible?.

The 1967 & 1968 Camaro Assembly Manuals list the J-Bolt part number as 3916608 on UPC 10, Sheet A2 for the COUPE models.  The REVISION RECORD in the 1967 Camaro Assembly Manual shows that on 11-29-66 "3916608 WAS 3893897".  My 1967 Corvair-Chevy II- Chevelle-Camaro Parts Catalog (Oct. 1966) lists GM # 3893897 in Gr. 7.632 as the Wheel Carrier Clamp BOLT for "67 CAMARO (CPE.)".  My 1968 Corvair-Chevy II- Chevelle-Camaro Parts Catalog (July 1968) lists GM # 3893897 in Gr. 7.632 as the Wheel Carrier Clamp BOLT for "67-68 CAMARO (SPT. CPE.)".

The 1967 & 1968 Camaro Assembly Manuals list the J-Bolt part number as 3841841 on UPC 10, Sheet A2 for the CONV. models.  The REVISION RECORD in the 1967 Camaro Assembly Manual shows that on 11-29-66 "3841841 WAS 3823275".  My 1967 Corvair-Chevy II- Chevelle-Camaro Parts Catalog (Oct. 1966) does not list a part number for the 67 Camaro CONV. model J-Bolt.   My 1968 Corvair-Chevy II- Chevelle-Camaro Parts Catalog (July 1968) lists GM # 3929975 in Gr. 7.632 as the Wheel Carrier Clamp BOLT for "68 CAMARO (CONV.)".

According to my Chevrolet Parts History Manual (Jan. 1965 - July 1973 - June 1975, for service parts sold over the counter) GM # 3916608 was replaced by GM # 488243 in May 1975.

According to my GM Parts History Manual (Jan. 1973 - June 1975, for service parts sold over the counter) GM # 3841841 was replaced by GM # 488243 in May 1975.

Oldsmobile Obsolete has a NOS 488243 J-bolt and it is listed as 5/16"-18 X 6" O.L. as shown in the 2nd photo. My 1974 Chevrolet Parts Catalog (July 1974) lists GM # 488243 as the Wheel Carrier BOLT for the 74 Camaro (exc. space saver site).

Does anyone has a photo and dimension of a 3841841 or 3929975 J-Bolt for the 67 & 68 convertible models?
Dave

[cook_dw]

Thank you for adding the info.  At this point in my data collecting I do not want to assume anything as being one vs the other.  I am hoping eventually we will have enough info and data points to confirm what you and I both believe on which one is for which application but for now I want the data to tell me.  But yes a convertible cars original jack J hook would be helpful as well as any C50 (rear defrost) equipped car's hook.

[DCL70SS]

I never noticed UPC C50, Sheet A2, in my 1968 Camaro Assembly Manual. The j-bolt is listed as GM # 3823275.
Thanks for the update.

BTW,
I just noticed that the 488243 J-bolt is also listed in the top parts of Gr. 7.632 in my 1974 Chevrolet Parts Catalog (July 1974) along with a description:
73-74 Pass. (exc. Sta. Wag.)
73-74 Nova (2 Dr.)(exc. Hatchback)
73-75 Chevelle (exc. El Camino)
It has the following description: "clamp (5/16"-18 X 7" O.L.).

The does not agree with the Oldsmobile Obsolete site for the NOS 488243 J-bolt which list it at 5/16"-18 X 6" O.L.

My 1973 Pontic Parts Catalog (Nov. 1972) lists GM # 488243 for "71-73 All F" (Firebirds) and "BOLT (w/space saver tire)(7 1/2" long)".
I tend to believe the parts catalogs.

[JST69Z28]

See 2 photos from what I believe are original jack parts on my 69 Z28 07A car.