F41 strut rod bracket

[Michael S.]

EA0C67FA-233C-4B52-BE01-85E7A743A1EA.jpgWhat will the hit be on replacement correctly casted and etched the other.2B2D77F6-FD9E-4156-87AB-3E3E0D08FB1C.jpg

[Joe L.]

Re: F41 strut rod bracket

[ATTACH=CONFIG]98673[/ATTACH]What will the hit be on replacement correctly casted and etched the other.[ATTACH=CONFIG]98672[/ATTACH]

Michael------


If you have F-41 suspension, I expect there would be no points loss if you were to use shock mount shafts with the 3829266 forging number on them. These were as-original for F-41 equipped cars. However, while these later became SERVICE for non-F-41 applications, they would not be correct for those. In addition, later SERVICE examples of the GM #3829365 and 3829367 have no forging numbers on them. I suppose, those might suffer a deduction.

[Michael S.]

[Joe L.]

Re: F41 strut rod bracket

Joe, thank you for explaining.
ln the new judging manual it says under JUdging Guide, that the F41 was only available with L72 pg 177 and pg 181 have I read that wrong ? As I have a L36 yet 15/16 frt roll bar , and 7 spring front and rear? Shocks went long ago in Spain as it’s an Export car, oh and J56.

Michael------


According to GM, F-41 and J-56 was only available if the engine option was L-72. Did they ever deviate from this? I don't know.

[Michael S.]

Re: F41 strut rod bracket

Again thank you for your honesty. The zone 21 and 001 in export may well be the reason for such options , that and the story about it being the 1966 Barcelona motor show corvette. Stay safe and well.
Kindest Regards
Mike.

[Danny P.]

Re: F41 strut rod bracket

26.jpg My 67 427-435 Original F41 3829265-6 rear lower shock mount they were more thicker then the stock mounts

[Joe L.]

Re: F41 strut rod bracket

[ATTACH=CONFIG]98690[/ATTACH] My 67 427-435 Original F41 3829265-6 rear lower shock mount they were more thicker then the stock mounts

Danny------

They should have the same forging number on either side. The F-41/FE-7 shock mounts were symmetrical forgings. So, the forging for either side was the same; only the machining was different (flat cut for anti-rotation in the spindle support).

The standard suspension shock mount shafts were not symmetrical forgings. So, there was a specific forging and forging number for each side.

I have seen these F-41/FE-7 shafts with forging numbers "3829266" or "3829265-66". I have not seen one with "382926566" as is yours but, apparently, that's another variation. Later SERVICE examples usually have no forging number, at all, on them but sometimes have the part number (3829265 or 3829266) printed on them with yellow ink. I have never noted any significant difference in the "thickness" or robustness of the non-machined portion of the F-41 shafts compared to the standard shafts. Obviously, the machined portion of the shafts is the same for either set. The difference between the F-41/FE-7 and standard suspension shafts is in the angularity of the portion of the mount which goes through the spindle support.

The standard suspension left shaft, GM #3820929, was discontinued from SERVICE in February, 1978 and replaced by the F-41/FE-7 shaft GM #3829265. The standard suspension right shaft, GM #3820930, was discontinued from SERVICE in July, 1978 and replaced by the F-41/FE-7 shaft, GM #3829266. However, the 2 different sets of shafts were used in PRODUCTION right through 1982.

Finding reproductions of the F-41/FE-7 shafts which are virtually identical to the GM pieces without forging numbers is EASY. Finding NOS examples of the F-41/FE-7 shafts (without forging numbers) is not too difficult. Finding NOS examples of the F-41/FE-7 shafts WITH forging numbers is difficult but doable. Finding NOS examples of the standard suspension shafts is a whole 'nuther story.

By the way, these shafts often show significant corrosion damage upon removal. This occurs to some degree even in areas of the country not plagued by salted roads. In my opinion, when they show pitting-type corrosion damage, they are unfit for re-use.

[Danny P.]

Re: F41 strut rod bracket

My both original lower Shock mount are the same part number 382926566 # left or right, the F41 shock mount 382926566 is a more thicker in mount area the shafts are all the same on F41 and standard shaft but the F41 mount is a completely thicker mount . i don,t have a photo but if you put the standard and F41 lower shock mounts side by side you,ll see the differents.

[Joe L.]

Re: F41 strut rod bracket

My both original lower Shock mount are the same part number 382926566 # left or right, the F41 shock mount 382926566 is a more thicker in mount area the shafts are all the same on F41 and standard shaft but the F41 mount is a completely thicker mount . i don,t have a photo but if you put the standard and F41 lower shock mounts side by side you,ll see the differents.

Danny------

No, your different side shock mounts are NOT the same part number. They have the same FORGING NUMBER but they do NOT have the same part numbers. The left side PART NUMBER is 3829265. The right PART number is 3929266. The reason that they have the same FORGING NUMBER is as I described in my previous post.

As far as the F-41 shaft being "completely thicker" than the standard shaft, I think not. Compare them side-by-side and I'll see? I don't need to but I'll do it anyway. Below is an NOS GM #3829265 F-41 left side shaft on the left and an NOS GM #3820930 standard suspension right side shaft on the right. Does the F-41 shaft look "thicker" than the standard shaft? It does not to me. The as-forged section of the 3829265 is slightly longer than the 3820930 as-forged section on the spindle support end but that's about it

As far as actual dimensions go it's like this:

diameter at spindle support end------F-41=1.14"; std= 1.14"

diameter at shock end------F-41= 1.25"; std=1.21"

thickness at "notch"--------F-41=0.77"; std=0.66"

width of as-forged section----F-41=1.08"; std= 1.15"

Also, while the LENGTH of the as-forged section of the F-41 shaft APPEARS longer than the standard shaft in the photos, it is NOT longer. Both are 2.19" in length.

So, where do these actual dimensions suggest that the F-41 mounts are "thicker" or more robust than the standard mounts?


DSCN3669.jpgDSCN3670.jpgDSCN3671.jpgDSCN3672.jpg

[Danny P.]

Re: F41 strut rod bracket

Well look at them Joe F41 on the left it is a slightly thicker shock mount where the part # number is stamp not the thread shaft the bulk of the mount is slightly thicker then your standard mount first photo show it better, states on page 209 judging guide and on the both threaded shafts part I was saying that are all the same they have to be the same size.

[Joe L.]

Re: F41 strut rod bracket

Well look at them Joe F41 on the left it is a slightly thicker shock mount where the part # number is stamp not the thread shaft the bulk of the mount is slightly thicker then your standard mount first photo show it better, states on page 209 judging guide and on the both threaded shafts part I was saying that are all the same they have to be the same size.

Danny-----


APPEARANCES can be deceiving although in this case I really don't see an apparent significant difference in appearance of what could be described as "thickness" or robustness. In any event, measurements don't lie. Note that the measurements are virtually the same for both shafts and, likely, the small differences fall within manufacturing tolerances for the as-forged portion of the shafts.

[Danny P.]

Re: F41 strut rod bracket

Danny-----


APPEARANCES can be deceiving although in this case I really don't see an apparent significant difference in appearance of what could be described as "thickness" or robustness. In any event, measurements don't lie. Note that the measurements are virtually the same for both shafts and, likely, the small differences fall within manufacturing tolerances for the as-forged portion of the shafts.

To me it slightly thicker or robustness photo #1 to my eyes Joe, what can i say and F41 shock should be thicker, both numbers or forging numbers are the same on left and right shock mounts, thanks Joe

[Michael S.]

Re: F41 strut rod bracket

58B09699-7937-4536-B369-719CB291CC1A.jpgWow, what a great debate/ discussion.
Joe& Danny thank you for your input , I have lined up the one I have .
Top set for use , Middle from spares, Bottom no marking but similar to top.
to my untrained eyes it’s the angle and meat in this section which gives it more for F41. Thank you kind Sirs.

[Joe L.]

Re: F41 strut rod bracket

[ATTACH=CONFIG]98699[/ATTACH]Wow, what a great debate/ discussion.
Joe& Danny thank you for your input , I have lined up the one I have .
Top set for use , Middle from spares, Bottom no marking but similar to top.
to my untrained eyes it’s the angle and meat in this section which gives it more for F41. Thank you kind Sirs.

Michael------


Yes, the angularity of the spindle support end of the shaft is what differentiates the standard versus F-41/FE-7 shafts. As far as "meatiness" goes, any perceived difference is an "optical illusion". My measurements demonstrate that.

[Michael S.]