upper control arms

Topic: upper control arms (Read 989 times) previous topic - next topic

upper control arms

June 29, 2013, 11:57:32 PM

Hey can some1 Measure a upper control arm bolit hole to bolt hole

upper control arms

Reply #1 – June 30, 2013, 08:24:13 AM

The dimension I have written down from sometime back in the '90's is 10-3/8"

upper control arms

Reply #2 – June 30, 2013, 01:44:29 PM

Chuck you da man

upper control arms

Reply #3 – June 30, 2013, 07:03:01 PM

I am assuming you are talking about the rear upper of course.

10.203" to 10.240" with a brand new bushing installed.

upper control arms

Reply #4 – June 30, 2013, 09:39:45 PM

If you're making some adjustable ones, somewhere in the vicinity of the two measurements will be fine.

If you're making fixed-length ones, pick a dimension 10.25-10.375". c-to-c

We used the 10-3/8" as a reference back when we made them at KB. I used a set couple sets of fixed length ones I made up for my own cars as well for a few years at 10-3/8", with no issues.

upper control arms

Reply #5 – July 01, 2013, 04:02:44 PM

che got back to me this am and said they set them at 10-1/4

upper control arms

Reply #6 – July 01, 2013, 05:02:13 PM

I have been modifying those arms for years. And if you go longer than 10.250 you will get a POSITIVE PINION ANGLE. Personally i have never measured one at 10 3/8 but this does not mean some were not that long. Chuck W is well versed on suspension components and i respect his answer. But i personally never measured one at that length. They normally measure around 10.240 or just short of 10 1/4" C-C. If you want a negative pinion angle a shorter upper is how it is accomplished. Like i posted above they normally run 10.203-10.240.

Note you can slot the hole in the arm to set your pinion angle properly. We do this and it has worked out really good. Whenever you lower or raise a car pinion angle should be checked. Most of the times it does not change but if it does the slots come in handy for adjustments. I use 2 washers on either side of the slot and once the pinion angle is set i tack weld them to the arm. Then remove the arm and finish welding them permanently. This is of course after i BOX THEM.