[James Mundstock]

What is the proper jack base for a '70 GTO? One place I read it just has a U and another said it is U70.

[rcorrigan5]

I took pictures of my jack base (from the top, from the side, and bottom side) for my '70 GTO to show you what it looks like. Mine looks like there is the letter "I" on the top side. My GTO is a Fremont car.

Keep in mind that there were three different jack supply sources for GM around that time (the same is true for my '68 and '69 4-4-2 convertibles). I'm looking at the page in my '70 LeMans/GTO & Grand Prix assembly manual titled "Installation Drawing - Spare Wheel And Tool Retainer, page number 14-6 dated 9-30-69 (Millenium Industries page 339). In the upper left hand corner, it outlines three different jack assemblies and three different bases, depending upon which jack assembly came with the car. The three jack assemblies differ basically by the shape of the piece that the rachet mechanism moves up and down on.

I don't know if the jack assembly that came with the car depended upon which assembly plant made the car or if it was just dependent upon the dominant source of supply at any given moment during the model year.

Hope this helps!

Randy C.

[68bird400HO]

Originally Posted by James Mundstock

What is the proper jack base for a '70 GTO? One place I read it just has a U and another said it is U70.

It sounds like you have the trapazoid style jack for which the U70 base is correct for 1970. The base pictured above is for the square mast style commonly found on California built cars. The third style is the solid iron "Y" style which I don't believe came out until '71.....at least that is the case with Firebirds and they use the same jacks from what I have seen.