Question about replacement of jack receiver tube and pyramid Options

[Richard Casto]

The PO had removed the old jack receiver tube and pyramid due to rust. I am going to replace these (not interested in leaving them off). The rust included not just the tube and pyramid, but also the exterior layer of the double wall longitudinal behind the pyramid. I have removed all of the rusted metal, but all that is left is the interior layer which is recessed into the longitudinal. I need to fabricate the exterior layer. The exterior layer also needs to be recessed but I don’t know by how much. If I go too deep the tube will be recessed too much. If I don’t go deep enough then it will not be recessed enough. I know I could just be safe and cut the end of the tube off if it sticks out too much, but I would rather just do it right and recess it the correct amount.

Here is the current situation. You can see the interior layer, but I don’t think (not sure) that the exterior is recessed quite as far back as the interior layer is.



I have replacement tubes and pyramids, so I know their dimensions. If someone could measure how far the tube sticks out beyond the flat surface on the top of the pyramid on their car, I can calculate how far to recess my replacement exterior layer. So in the diagram below, I know “A” and “B”. If someone can give me “C”, I can calculate “D”. If you can’t easily measure “C” then a combined “B” + “C” measurement (total height of tube from longitudinal) will work as well.



Thanks for the help!

[Joe Bob]

I bet if you posted a poll, the results would show that the use of the jack post is a bit dangerous and most owners go with a floor jack. "I" use the donuts at the four corners of the pan.

Either way, good luck in whatever you decide to do.

[SirAndy]

I bet if you posted a poll, the results would show that the use of the jack post is a bit dangerous and most owners go with a floor jack. "I" use the donuts at the four corners of the pan.

I use the stock jack posts all the time. There's nothing wrong with them as long as the car is free of cancer ...

(IMG:style_emoticons/default/shades.gif) Andy

PS: The "donuts" were never meant to be used to jack up the car. The ones in the front especially since they're on the underside of the rather thin floor pan and not anywhere near anything structurally sound.

[Joe Bob]

I bet if you posted a poll, the results would show that the use of the jack post is a bit dangerous and most owners go with a floor jack. "I" use the donuts at the four corners of the pan.

I use the stock jack posts all the time. There's nothing wrong with them as long as the car is free of cancer ...

(IMG:style_emoticons/default/shades.gif) Andy

I agree, it's the crappy stock jacks that booger them up. I still use my jack posts on my 911 because it's rock solid and I use a plug in jack pad. I just prefer the the donuts on the 914 which the 911 does NOT have.

Habit....