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PY Online Forums - Bringing the Pontiac Hobby Together (https://forums.maxperformanceinc.com/forums/index.php)
-   70-73 Firebird & TA TECH (https://forums.maxperformanceinc.com/forums/forumdisplay.php?f=437)
-   -   Which subframe do I have (https://forums.maxperformanceinc.com/forums/showthread.php?t=834768)

cnc 10-12-2019 03:18 PM

Which subframe do I have
 
Hi Guys
I'm looking at my subframe and was wanting to install some Global west Del alum bushings , there was a set for sale her on py ....
The lower control arm bolts I can take a 9/16 wrench and slide it over the threaded end of the bolt which from what I've read means I have a 74 subframe...73 subframe cars have 1/2 bolts
However the upper control arm bushings on my car are both the same size or so they look very close ...which would mean they are 73 upper arms ???
Can anyone shed some light on this
Are the upper control arm bushings considerably different in size looking at them with your eye...
Thanks for any help.....

johnta1 10-12-2019 05:05 PM

You can check the date code of the subframe?

Subframe Dates

:)

I see you posted in that thread also.

:)

cnc 10-12-2019 08:21 PM

Hi Yes I did post in that thread on the 70 I used to have ...I don't see anything on this frame on the outside.on the drivers side. Maybe a little more elbow grease .....can it be elsewhere on the subframe

Held for Ransom 10-12-2019 09:21 PM

What is stamped on the upper control arms (front rib of the arm)? What is the build date of the body?
http://www.forums.maxperformanceinc....d.php?t=657504

cnc 10-13-2019 09:54 AM

Hey HFR by goin through that link it looks like I'm in the same relm 73 uppers 74 lowers.....
My upper bushigs look like the same size and the lower bushigs take 9/16 bolts...
Give me a bit and I'll go check build date and see if I can see a stamp on the arm...

cnc 10-14-2019 08:48 AM

1 Attachment(s)
Here is the cowl tag off the car still need to look at the arms...can I see the markings while still bolted to the car ...

Held for Ransom 10-14-2019 09:04 PM

2 Attachment(s)
Yes, you can.

Looks like yours is Thursday or Friday build car.

cnc 12-02-2019 08:58 PM

Do those arm markings make it a 73arm HFR
Not sure what I'm looking at on the armfor a date code ...
I know the bushings could be different sizes but are they significant in difference to see or are they so close u need to measure the bushings.My arms are still on the car so looking at my bushigs they look the same size

Held for Ransom 12-03-2019 12:51 AM

My '74 bushings have an approx. 1-3/8" outer sleeve.

Don't worry about looking for a date code.

cnc 12-03-2019 07:57 AM

So both bushings on the 74 are the same size or different frt to back...
I was under the impression that the bushings were different sizes between frt and rear???

Held for Ransom 12-04-2019 09:05 PM

Could be. From trying to measure, front is approx. 1.375" and rear is 1.310".


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