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Old 10-12-2019, 03:18 PM
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Default 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.....

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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's
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Old 10-12-2019, 05:05 PM
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You can check the date code of the subframe?

Subframe Dates



I see you posted in that thread also.


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Old 10-12-2019, 08:21 PM
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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

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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's
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Old 10-12-2019, 09:21 PM
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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

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Old 10-13-2019, 09:54 AM
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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...

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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's
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Old 10-14-2019, 08:48 AM
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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 ...
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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's
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Old 10-14-2019, 09:04 PM
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Yes, you can.

Looks like yours is Thursday or Friday build car.
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Old 12-02-2019, 08:58 PM
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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

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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's
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Old 12-03-2019, 12:51 AM
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My '74 bushings have an approx. 1-3/8" outer sleeve.

Don't worry about looking for a date code.

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Old 12-03-2019, 07:57 AM
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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???

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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's
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Old 12-04-2019, 09:05 PM
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Could be. From trying to measure, front is approx. 1.375" and rear is 1.310".

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