Is this jack a Corvette jack?? What year(s)?

[Michael G.]

Not much info on jack in image however shows not to be a mid year jack as it configured differently. Most likely '68 and up? Corvette jack? What's the best guess as to when this style was used?

[Joe L.]

Re: Is this jack a Corvette jack?? What year(s)?

Not much info on jack in image however shows not to be a mid year jack as it configured differently. Most likely '68 and up? Corvette jack? What's the best guess as to when this style was used?

Michael------


It looks like one to me. It looks like one of the 63-68 jacks. Assuming it didn't start life as a SERVICE jack, the date code on it should pretty much establish what year car it was originally installed in.

[Michael G.]

Re: Is this jack a Corvette jack?? What year(s)?

Michael------


It looks like one to me. It looks like one of the 63-68 jacks. Assuming it didn't start life as a SERVICE jack, the date code on it should pretty much establish what year car it was originally installed in.

Regarding the 63-68 usage, two to three things I don't see Joe. No 'A' on the pad, no nylon washer (bearing) near the hex drive and the auger ends passes through a metal block rather than a 'U' shaped support as auger exits the jack. This is was what lead me to believe it might be a C-3 jack.

[Joe L.]

Re: Is this jack a Corvette jack?? What year(s)?

Regarding the 63-68 usage, two to three things I don't see Joe. No 'A' on the pad, no nylon washer (bearing) near the hex drive and the auger ends passes through a metal block rather than a 'U' shaped support as auger exits the jack. This is was what lead me to believe it might be a C-3 jack.

Michael-----


The saddle does not appear wide enough to me for it to be a 1969+ jack.

It could be a very late C3 jack (i.e. 1980-82). I believe they went back to a jack with a narrower saddle at that time. I think it should still have a date code on it, though.

[Edward J.]

Re: Is this jack a Corvette jack?? What year(s)?

Mike, Have you looked at the jack for any dates stamped any where? it appears to be a C3 jack. There will stamp a letter and number on the side of jack. its been a while since I looked at my 72 jack. sometimes they stamp something on one of the rivits also.

[Michael G.]

Re: Is this jack a Corvette jack?? What year(s)?

Mike, Have you looked at the jack for any dates stamped any where? it appears to be a C3 jack. There will stamp a letter and number on the side of jack. its been a while since I looked at my 72 jack. sometimes they stamp something on one of the rivits also.

No I have not Ed, what your seeing is an image sent to me. It's a jack for sale in my area. Was initally trying to pin point jack application....era.

[Reba W.]

Re: Is this jack a Corvette jack?? What year(s)?

I agree Joe; it does not look wide enough for the early C3s. Jacks still had the A on top through mid-1970s; I am not sure about the narrower ones of the later C3s. There should be a date on one of the outer rails consisting of the last digit of the year and a letter for the month. e. g. 1 H is August 1971.

[David L.]

Re: Is this jack a Corvette jack?? What year(s)?

Michael,

The jack looks exactly like the service jack (GM # 3958710) that I bought from my local Chevrolet dealer in the early 1980's for about $30+/- (with my 25% discount). I bought the jack just because it was cheap $. The date code "9C21" (1979, March 21st) was stamped on the end block with the 3/4" hex nut and it did not have the letter "A". I sold it a few years later.

Ask the seller for the stamped date code on the block with the 3/4" hex nut.

I have never seen an original 1979 Corvette jack.

Chev. Parts History (for service parts):
3825993 replaced in Oct. 1969 by 3958710 which was replaced in March 1981 with 14016051

Dave

[John S.]

Re: Is this jack a Corvette jack?? What year(s)?

the exact jack is used on a 78 corvette. date codes are usually found on the right side jack base rivet head. common date code found on 78 corvette jack is 743. seen this jack used on corvettes since at least late 76.

[Joe L.]

Re: Is this jack a Corvette jack?? What year(s)?

All------


According to GM there were 3 jacks used over the 1963-82 period for PRODUCTION and SERVICE. The 1963-68 PRODUCTION and SERVICE jack was GM #3825993. The 1969-79 PRODUCTION and SERVICE jack was GM #3958710. The 1980-82 PRODUCTION and SERVICE jack was GM #14016051. The dates of change of the part numbers in SERVICE (as Dave has described above) closely align with the change in PRODUCTION .

It is possible that minor features of each jack changed over the period of its use and SERVICE availability. However, I do not expect that the saddle width was among the differences for any given part number.

Attached are photos of a known-original 1969 jack of, presumably, GM #3958710 and with date code "9 H". This jack has a saddle width of 2-3/16". I don't know what the saddle width was of the predecessor and successor jacks but I believe that both were narrower.


DSCN2838.jpgDSCN2839.jpgDSCN2840.jpg

[John S.]

Re: Is this jack a Corvette jack?? What year(s)?

All------


According to GM there were 3 jacks used over the 1963-82 period for PRODUCTION and SERVICE. The 1963-68 PRODUCTION and SERVICE jack was GM #3825993. The 1969-79 PRODUCTION and SERVICE jack was GM #3958710. The 1980-82 PRODUCTION and SERVICE jack was GM #14016051. The dates of change of the part numbers in SERVICE (as Dave has described above) closely align with the change in PRODUCTION .

It is possible that minor features of each jack changed over the period of its use and SERVICE availability. However, I do not expect that the saddle width was among the differences for any given part number.

Attached are photos of a known-original 1969 jack of, presumably, GM #3958710 and with date code "9 H". This jack has a saddle width of 2-3/16". I don't know what the saddle width was of the predecessor and successor jacks but I believe that both were narrower.


[ATTACH=CONFIG]45413[/ATTACH][ATTACH=CONFIG]45414[/ATTACH][ATTACH=CONFIG]45415[/ATTACH]

the jack with the hole in top of the pad(76 and older model year) and the use of the letter A predate the jack in question. to clarify your use of "saddle width", is it meant to be the outside distance between the lower arms? that is the area where i measure 2 3/16 to 2 1/4 on a 78 jack.

[Joe L.]

Re: Is this jack a Corvette jack?? What year(s)?

[QUOTE=John Scopelite (50653);655593]

All------


According to GM there were 3 jacks used over the 1963-82 period for PRODUCTION and SERVICE. The 1963-68 PRODUCTION and SERVICE jack was GM #3825993. The 1969-79 PRODUCTION and SERVICE jack was GM #3958710. The 1980-82 PRODUCTION and SERVICE jack was GM #14016051. The dates of change of the part numbers in SERVICE (as Dave has described above) closely align with the change in PRODUCTION .

It is possible that minor features of each jack changed over the period of its use and SERVICE availability. However, I do not expect that the saddle width was among the differences for any given part number.

Attached are photos of a known-original 1969 jack of, presumably, GM #3958710 and with date code "9 H". This jack has a saddle width of 2-3/16". I don't know what the saddle width was of the predecessor and successor jacks but I believe that both were narrower.


[ATTACH=CONFIG]45413[/ATTACH][ATTACH=CONFIG]45414[/ATTACH][ATTACH=CONFIG]45415[/ATTACH][/Q

the jack with the hole in top of the pad(76 and older model year) and the use of the letter A predate the jack in question. to clarify your use of "saddle width", is it meant to be the outside distance between the lower arms? that is the area where i measure 2 3/16 to 2 1/4 on a 78 jack.

John-----


The saddle is the portion of the jack that contacts the frame of the car when it is used. On the jack I pictured, it is the part on the top which includes the "A" stamping and the hole you previously referred to. The measurement I provided is the width from side-to-side of the saddle as measured with a vernier caliper.

If the jack saddle width changed from 1977-79, then either the specifications for the 3958710 changed markedly or some other jack of unknown and unpublished part number was used in PRODUCTION and sold in SERVICE during that period. It's not possible that the 14016051 was used as early as 1977 as that part number did not exist at that time. The earliest that part number could have existed would have been late 1978.

[John S.]

Re: Is this jack a Corvette jack?? What year(s)?

joe, my measurement come from the jack in my 78 corvette which has a date code of 743, 43rd week of 77. other examples of these jacks are listed on ebay. if you look closely, the jack in the first post is narrower than the one you posted

[Joe L.]

Re: Is this jack a Corvette jack?? What year(s)?

joe, my measurement come from the jack in my 78 corvette which has a date code of 743, 43rd week of 77. other examples of these jacks are listed on ebay. if you look closely, the jack in the first post is narrower than the one you posted

John-----


Yes, I'm convinced that the jack originally pictured in this thread is the later C3 jack. The question at this point is whether the 3958710 jack, which is supposed to be the one used in PRODUCTION for 1969-79 was markedly changed at some point (i.e. 1977-79) or whether a jack of some other part number was substituted for the 3958710 starting about 1977. It just seems unlikely to me that the jack was changed as much as the difference between my jack and your jack but with the part number remaining 3958710.

By the way, what is the saddle width (as I described it above) of your jack?

[John S.]

Re: Is this jack a Corvette jack?? What year(s)?

John-----


Yes, I'm convinced that the jack originally pictured in this thread is the later C3 jack. The question at this point is whether the 3958710 jack, which is supposed to be the one used in PRODUCTION for 1969-79 was markedly changed at some point (i.e. 1977-79) or whether a jack of some other part number was substituted for the 3958710 starting about 1977. It just seems unlikely to me that the jack was changed as much as the difference between my jack and your jack but with the part number remaining 3958710.

By the way, what is the saddle width (as I described it above) of your jack?

saddle width is 1 7/16". i also see that frame repair sections are different for the later 70s corvette. maybe the changes in the frame have something to do with the narrower saddle width.