I have a NOS scissor jack GM #3958710. I am pretty sure of the application, but it has a date stamped into one of the side rivets and I am not sure how to decipher the numbers. The numbers are " 813 " which I think is a date code. Thanks in advance.
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In Appreciation of John Hinckley -
Re: Scissor Jack GM #3958710
Joe,
I also thought that the second digit (alpha character) was the month. I guess the question is where is the date stamped on the #3958710 jack? The second digit on the rivet head stamp looks like dog bone, which is a common GM bolt head marking.Comment
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Re: Scissor Jack GM #3958710
The date code on the rivet head indicates a mid to late 1970 jack. The ones before that had the date code stamped on one of the links, and have the characters Joe L describes above. I am not sure of the code used on those with the date on the rivet head.
Is it possible the middle character is an "I" = September?TerryComment
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Re: Scissor Jack GM #3958710
Michael,
Your jack with a date code of 813 would correspond to a Stant built jack assembled the 13th week of 1978. Look for a Stant logo on the base. These jacks had their dates stamps located on a rivet, like yours.
Michael's jack:
1975 and earlier jacks built by Ausco had the alpha-numeric (month/year or year/month) date stamp as previosly mentioned. Also, as previously mentioned, the date stamp was located on one of the arms. These can also be identified by the A on the top pad of the jack
The 1975-77 TIM&JG revisio team studied these jacks and their changes during this time period. Below are 2 pics of one of our team members jacks, from his November 1976 built 1977 car. Jack asembled the 40th week of 1976, (late September-early October)
Mr Joe Lucia--could Michaels's jack be a SERVICE replacement jack, considering it has a PN tag? Your opinion, please.
thank you,Guy
'75 Convertible L-82/M-21 Silver/Silver L
'73 Coupe L-82/M-20 Med Blue/Black L
'23 HTC, 3LT, Elkhart Lake Blue/Jet Black red stitched, Z51 with mag ride,
FEL, 70th wheels, carbon flash roof, nacelles, mirrors, spoiler, full length stripes,
edge red calipers plus other goodiesComment
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Re: Scissor Jack GM #3958710
Michael,
Your jack with a date code of 813 would correspond to a Stant built jack assembled the 13th week of 1978. Look for a Stant logo on the base. These jacks had their dates stamps located on a rivet, like yours.
Michael's jack:
1975 and earlier jacks built by Ausco had the alpha-numeric (month/year or year/month) date stamp as previosly mentioned. Also, as previously mentioned, the date stamp was located on one of the arms. These can also be identified by the A on the top pad of the jack
The 1975-77 TIM&JG revisio team studied these jacks and their changes during this time period. Below are 2 pics of one of our team members jacks, from his November 1976 built 1977 car. Jack asembled the 40th week of 1976, (late September-early October)
Mr Joe Lucia--could Michaels's jack be a SERVICE replacement jack, considering it has a PN tag? Your opinion, please.
thank you,
Guy-------
There is absolutely no question that this is a SERVICE jack. First of all, as you note, it has a GM SERVICE parts label. PRODUCTION parts virtually never have a SERVICE parts label although a small number have similar labels. Second, the SERVICE label, from what I can see of it, appears to me to be from a much later period than the release date of the 3958710 jack (e.g. 1969).
The GM #3958710 was used in PRODUCTION from mid 1969 through the 1979 model year. It was available in SERVICE until March, 1981 when it was discontinued and replaced by GM #14016051, the jack used in PRODUCTION for 1980-82 Corvettes.
The GM #3958710 replaced the GM #3825993 for SERVICE of all 1963-E1969 Corvettes in October, 1969.In Appreciation of John HinckleyComment
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Re: Scissor Jack GM #3958710
Guy and Joe, thank you very much. That definitely cleared things up. I did look on the bottom side of the jack and it has a SMP logo.Comment
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Re: Scissor Jack GM #3958710
Michael,
Back about 1980 or maybe 1981 I bought a Corvette service scissor jack for $28.50 (25% discounted from $38.00 list price) from my local Chevrolet dealership but I sold it several years ago. According to my notes the 3958710 jack was stamped "9C21" (1979, March 21th). According to Chevrolet and GM Parts History GM # 3825993 (the 63-67 jack) was replaced by GM # 3958710 in Oct. 1969 which was them replaced by GM # 14016051 in March 1981.
I believe that your 3958710 service jack might be stamped "8I13" (1978, Sept. 13th). BTW, somewhere in my collection of about 50 or so bumper jacks I have a bumper jack from a late 1970's Firebird stamped "SMP".
DaveComment
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Re: Scissor Jack GM #3958710
David,
I wish that was the case of my #3958710 service jack. The next rivet head on the same side of the jack has the same dog bone shape. I would say that is the head making of the rivet head. I have a lot of GM bolts that have the same head marking that is on the rivet head.Comment
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Re: Scissor Jack GM #3958710
Michael------
Keep in mind that while the Stant-manufactured jack you have did begin life as a SERVICE jack, it is identical in every way to the 3958710 used in PRODUCTION for later C3's. As I've said many times before, SERVICE parts were, in the VAST majority of cases, exactly the same as PRODUCTION parts manufactured in the same time period.In Appreciation of John HinckleyComment
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Guy
'75 Convertible L-82/M-21 Silver/Silver L
'73 Coupe L-82/M-20 Med Blue/Black L
'23 HTC, 3LT, Elkhart Lake Blue/Jet Black red stitched, Z51 with mag ride,
FEL, 70th wheels, carbon flash roof, nacelles, mirrors, spoiler, full length stripes,
edge red calipers plus other goodiesComment
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