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8 replies

Rear upright taper

push1267push1267Member
I'm about to install a set of adjustable rear upper a-arms I purchased from Larry Stock a while ago. As they come, with a standard non-tapered bolt, I'll have to drill out the taper in the uprights to mount them.

I would like to have the option of being able to convert back to original a-arms in the future so I would prefer NOT to drill the uprights.

Just wondering if there is an alternative to drilling - like maybe using a stud to heim tie rod adapter, as I've seen mentioned in another post. Has anyone tried this?
Does anyone know the degree and dimentions of the taper in the upright - and possibly a place to buy the rod adapters?

Any help is appreciated

Kristian
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bosswrenchbosswrenchMember
Push, you're correct- there IS such a stud available from Speedway Motors in NE. Browse to in the racing section. It is commonly used in dirt track race cars that use production components, and works perfectly with the Pantera's Ford or Chrysler 7 degree taper. There are two studs available that take different heims- one has a 1/2" straight stud diameter (normally used in bump-steering corrections) while the other has a 5/8" diameter bore more appropriate for the rear upright. But check the bore of your a-arm heim before ordering. I also suggest a pkg of 'Seals-it" in the correct size to keep dirt & water out of your heims and extend their life. Note when ordering to specify "Ford" with the part number as there also a tapered stud using a GM taper which is NOT 7 degrees.
Trust me- converting a drilled-out rear upright or steering arm taper back to stock is not simple, fun nor cheap. And while the Speedway studs are cheap and I've been ragging on all our vendors for years on this subject, still none include these simple tapered studs (or the seals) with their a-arm or bump-steer kits.
panterrorpanterrorMy 74 GTS
quote:
Originally posted by Joules5:
Kristian,

They should come with all the parts necessary to bolt on, including tapered spacers to sit in the taper hole and center the bolt.

You can see them in this photo of my a-arms.

Julian


Yes, and especially important are those safety washers on just under the head of the bolt. If the heim ever fails the washer is what keeps the top end of your upright stabilized instead of allowing it to flop around.

Best,
K

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