Topic: 69 Jacks

[J_Speegle]

We've had some ongoing discussions about the correct/original jacks for each year and plant (if they are specific or different)

Saw a couple this last week that appear to be original to the car. As mentioned before this is difficult to determine, since its so easy to lose one or replace one, but maybe if we collect enough samples a pattern will appear.  Just sharing what I found

From 9R03M4808xx (fine thread, U shaped ends, stamped K8)











From 9T02M1863xx (coarse thread, U shaped ends, stamped 9C)

[SCJSTU]

OMG.......hope you can fig out 69 and 70 jacks Jeff because I have seen several varietions.........who knows what is orig or not?

I have some pics at home will try to post....

wonder if there were couple mfg of jacks that made Ford jacks ?

[J_Speegle]

OMG.......hope you can fig out 69 and 70 jacks Jeff because I have seen several varietions.........who knows what is orig or not?

Hope WE can figure it out We have shown in the past that if we collect enough data points patterns often appear suggesting an answer to at least - if an owner is missing a part which would be the best or most typical application. Always worth a try

wonder if there were couple mfg of jacks that made Ford jacks ?

Very possible given what is being found - of course this would fit the pattern for many of the parts that make up our cars and it seems that most of the time certain suppliers supplied specific assembly plants. One example is shocks and for 69 front upper shock mounts/caps

[specialed]

jeff your photos are correct from what i have seen but you left out dearborn fine thread RH style.

[Carl]

I tried about two years ago to figure out the '69 and '70 jacks, without much success, as it seems like there were at least three different vendors based on the rivet set patterns, and to make matters even worse, there were at least two size variations on the jacks themselves.  On the "small" version, the pivot holes are about 5 inches apart, on the large version, they are 6 inches apart.  I spoke with owners having 5 inch jacks claimed to be original, as well as owners having 6 inch jacks claimed as originals.  I have samples which had the same rivet set patterns and markings, one 5 inch, and one 6 inch size, suggesting both sizes came out of the same factory.  Both fit inside a rim, both have the same patent and date code stampings, ends, etc.  One plant apparently didn't use patent stampings or a date code. 
All had the fine pitch square threaded center (no, its not an Acme thread, contrary to common wisdom), so that coarse thread unit is a new one to me.  The one fairly consistent difference seemed to be the existence of the '69 u-shaped ends versus the '70 block formed ends. I don't doubt that the size variation may have been intended to be between car lines, but I'm not sure the assembly line distinguished between them.  I've looked at several nice original condition jacks, but I haven't seen any paint codes to signify the size difference.  I can't say whether the jacks having no patent numbers or date codes aren't later production, but the examples I have looked at looked appropriately old.

  Carl

[Bob Gaines]

I tried about two years ago to figure out the '69 and '70 jacks, without much success, as it seems like there were at least three different vendors based on the rivet set patterns, and to make matters even worse, there were at least two size variations on the jacks themselves.  On the "small" version, the pivot holes are about 5 inches apart, on the large version, they are 6 inches apart.  I spoke with owners having 5 inch jacks claimed to be original, as well as owners having 6 inch jacks claimed as originals.  I have samples which had the same rivet set patterns and markings, one 5 inch, and one 6 inch size, suggesting both sizes came out of the same factory.  Both fit inside a rim, both have the same patent and date code stampings, ends, etc.  One plant apparently didn't use patent stampings or a date code. 
All had the fine pitch square threaded center (no, its not an Acme thread, contrary to common wisdom), so that coarse thread unit is a new one to me.  The one fairly consistent difference seemed to be the existence of the '69 u-shaped ends versus the '70 block formed ends. I don't doubt that the size variation may have been intended to be between car lines, but I'm not sure the assembly line distinguished between them.  I've looked at several nice original condition jacks, but I haven't seen any paint codes to signify the size difference.  I can't say whether the jacks having no patent numbers or date codes aren't later production, but the examples I have looked at looked appropriately old.

  Carl

Carl typically the smaller jacks were for 65/66 and the larger jacks were for 67-70. 

[Carl]

I've heard that theory, the problem is the 5" jacks I have have the crossed top, fine pitch thread, and block formed ends (being more a '70 guy), as well as late 9/early 0 dates (i.e., 9K, 0C, etc.)  :^)
I tried the hypothesis that the 5" jacks were for space savers, but I've talked to space saver owners who claimed their 6" jacks were original to the car, as well as owners with 5" jacks on cars with full size spares, that again, the owners claimed as original, as well as vice versa.  I also couldn't find a plant difference, the majority of jacks I looked at were in Dearborn cars.
I set out to figure out how to restore a jack to a really nice standard, i.e., fully disassemble them, refinish the components, then reassemble.  I machined new rivets (including the rivets with the sunken "T") and rivet sets, machined new end blocks, etc., but I'm stuck because I could never figure out what was correct, especially after I figured out some jacks were smaller than others (yeah, the rebuild process ended up being very time consuming.)  One "humourous" day was when I tried to thread my new end block complete with Acme thread onto an old rod, no go, which lead me down the path of detail measuring the thread on the rod, leading to the conclusion it was a custom square thread, not an acme thread.   Luckily my young daughters didn't hear that language . . . Hint, my new square end Acme threaded block is worthless, and threading new blocks ain't gonna happen . . .

  Carl

[Bob Gaines]

I have both course and fine thread in the shorter jacks and the longer jacks too. Also the block type and the "U" shaped. It is a pretty accepted notion that the shorter jacks are for the earlier cars and vice versa . A little past the theory stage on the short long jack at least as to the way it apply's to 65-70 Mustangs.

[Carl]

I'd buy that the '69-'70 date code 5" jacks were supposed to be for Mavericks or such, but just got mixed up on the line, but if so, that would mean that the factory did put 5" jacks in the Mustangs, so it would seem to be wrong to say they are incorrect.  That's why I was hoping for a paint marking to show that someone at least recognized they were different.
I tried looking in my MPC/assembly manuals to see if there was any call out, the MPC lists the same jack for the Maverick, Mustang, and Pinto, no help, especially since it calls out the same jack for '71s, which IIRC were supposed to be pinch weld jacks.  The jack that was in my Boss (Metuchen) when I bought it, which had an appropriate date code, was a 5" jack.  The jack that was in my 'vert (Dearborn) was a 6" jack, again appropriate date code.  The Boss appeared to be more molested, as the space saver mount was in the wrong position (it had an incorrect space saver tire/rim well), the 'vert, also a factory space saver car, had a full size spare but the original mount when purchased, leading me to discount either as actual evidence.
I don't doubt its possible that the '69-'70 date coded 5" units were assembled as replacements for the earlier cars, and found their way into the later cars later (or even as a cost cutting measure, a la the C9ZE/C9FE Boss intake manifolds with mistampings).  If we want to say 6" is correct, it doesn't bother me, as I have enough to build a good one for shows, I'm just trying to avoid spending time restoring the wrong one.  :^)

  Carl

[69SCJQ4.30]

Had a jack question so I just thought I would ask it in this post seeing as it is the topic, when did they go to the U-shaped ends, got a few jacks here ones with u-shaped ends and others with the solid block style just trying to separate them and tag them. Thanks

[specialed]

Solid block fine thread Dearborn- U-shaped finethread SJ- U-shaped coarce thread MT. from what I seen. mostly vendor change
..

[Sluggo]

Here's mine. 9R02M176019 13e build date, actually built 5/12/69


Believed to be original. The final being straightened, cleaned and repainted.

[Rusty]

I know this is an old thread but I've recently been researching jack info for my Metuchen 69 Mach 1. I found an article in Mustang Monthly from July 2013 about how to identify 1965-1978 Mustang jacks. Below is a link to the MM article and I've also included a link to the website that has the information that was used in the article. Check them both out. Very, very interesting stuff.

http://www.mustangmonthly.com/howto/1307_how_to_identify_1965_1978_mustang_jacks/viewall.html

http://www.anghelrestorations.com/1969-and-1970-mustang-facts.html

[J_Speegle]

I know this is an old thread but I've recently been researching jack info for my Metuchen 69 Mach 1. I found an article in Mustang Monthly from July 2013 about how to identify 1965-1978 Mustang jacks. Below is a link to the MM article and I've also included a link to the website that has the information that was used in the article. Check them both out. Very, very interesting stuff.

Written by one of the members here (most of the info was posted here way before it got in the magazine and this thread (posted about a year and a half ago) was a effort to add some addition documentation to his research prior to his article both online and in the magazine. You can find links to much of the info doing a search in this site.