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The Type I was used from 63 to around May/June 65. Type II was used for the balance of 65. The Type I & II jacks are basically the same with some minor differences.
The Type III jack was used for 66 & 67 . Starting in Jan 67 the Type III jacks added a 2 digit date (a single letter for the year and a letter for the month). The most obvious difference between the Type I/II and Type III jacks is the shape of the bearing used behind the bolt head that raises & lowers the jack.
The jack handles vary also. The 63-64 handle has no holes in it, the 65-66 handle has a single hole in the top of the handle and 67 (and later) handles have 3 holes in the handle.
Photos below of the two major jack types. The '63-'65 Type I and II jacks have a metal bearing at the drive end of the screw, the U-shaped bracket at the anchor end with the nut is flipped outboard, and there are no holes in the handle.
The Type III jack has a white nylon bearing inbetween two large washers at the drive end instead of the metal bearing, the U-bracket at the other end is flipped inboard, and the handle has three holes in it.
All have an "A" stamped on the load bracket (for Ausco, the manufacturer).
I think I may have a Type 3 stashed away somewhere up in the loft (I seem to recall the rubber around the lug wrench). Are they valuable?
Go to any Corvette catalog website--correct jacks that are for show and no go, go for $300 and then some. If it's in good condition, you should have no trouble selling it. It will have the most value for someone that needs one for judging purposes, rather than usefulness.
Fortunately my 67 came with one--found many that did not, mostly because former owners take the jack and spare out for weight and somewhere along the line sold the car forgetting to put them back in (or did so on purpose, who knows).
Spare tires are another item--I've got that too, thankfully with an original tire that's never been on the ground from the looks of it. It's obscene what you have to pay to replace "missing" jacks, jack handles and rims for spares (with no tire) for what is a basic steel wheel; or the pain in the neck of going treasuring hunting through junk yards and swap meets to find what you need.
If the "1 E" is stamped on a scissors link like the photo below, it's a May, 1971 jack - they weren't dated until mid-1967.
Even if it has the metal drive bearing, just like this, rather than the nylon bearing?
Also the stamps are different. The 1 is deep and prevelent and the E is light and shallow, so much so that the bottom line on the E barely shows. Also the number comes before the letter (if any of this matters).
Even if it has the metal drive bearing rather than the nylon bearing?
The metal bearing is typical of the Type I and II jacks, but I've never seen one dated. Dating didn't start until January, 1967, on the Type III jacks. Maybe a "mix" of parts?
The metal bearing is typical of the Type I and II jacks, but I've never seen one dated. Dating didn't start until January, 1967, on the Type III jacks. Maybe a "mix" of parts?
While the handle may not have come with the jack originally, just looking at it, I doubt that the jack itself is a mix of parts. So again, how can one determine a Type I from a Type II (so that I may look for other clues) or is it possible that the '71 used the metal bearing?
Also , it would certainly be easy enough to fill in the letter/number and have a Type I or Type II if I knew the difference.