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Old 03-31-2020, 01:00 AM
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Default Fisher frame dimension dilemma, 1976 TA

Can someone please help.
I have a 76 Fisher body manual, and have compared with 77 and 78. All of the vertical dimensions appear the same.
I have set out a Leica cross line laser in the absence of a chassis machine for the known body points d, e, f, g and all come within 1mm or so of my level datum.
Problem is I can even get a, b, c, within 4" of the stated dimensions?
Surely there can't be a typo on 3 years worth of body shop manuals?.
C is a body measurement, so I can eliminate any body bushing thickness differences.
Another issue is the calculated difference between b and c, is smaller than the installed new Energy Suspension bushing by about 3/8". It has a large flat washer welded to the top, and it's about 3/8 r taller than the rear subframe bushing.
Still doesn't explain the "c" measurement though?.
Any help much appreciated

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Old 03-31-2020, 01:09 AM
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With d, e, f, g all in relation to each other, I get around 6_7/8" for body dimension c, not 9_15/16" as per the manual?.
Nearly 10" from the datum line here puts the mark up past the inner guard mounting bracket?
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Old 03-31-2020, 09:13 AM
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Is that an original manual or reprint? It very well may be a typo. Unless someone beats me to it I will check mine later today. I have an original fisher body manual but its out in the shop right now.

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Old 03-31-2020, 03:32 PM
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Pretty sure it's an original bound book
On the contents page it has copyright symbol and September 1975, not sure how else to Check.
I did check 77 and 78. Pdf versions online. All were the same.
73 has the same front end dimensions, some in the rear were different around the frame rails.
(vertical dimensions that is).
I just can't understand how the 4x rear body dims be within 1mm or so, and the firewall body mount location be out by such a huge amount?
Surely I am not the first person to ever measure this and have an issue, or after 40 years no one else has found an issue with the published dimensions in the mm annual lol
Appreciate any help, this has stalled me, and has become very frustrating.

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Old 04-01-2020, 10:31 AM
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I have my 77 body manual in front of me. Your dimensions are the SAME as the ones in my book. That part seems to jive.
Where are you taking the "c" dimension from?
According to my drawing it looks like "b" is to the bottom of the frame mount at 9-9/16".
"c" dimension is to above the top of the frame mount at an unspecified point. I would assume its the top of the bushing. This dimension is 9-15/16" a difference of 14/16" (7/8"). Again just an assumption but I suspect this is the prescribed thickness of the body bushing.

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Old 04-01-2020, 03:39 PM
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Hi there, yep that would is Correct. But the published dimension for that is Miles different than what's measured on the body. At this stage the bushings etc have no influence as they are all body dimensions.
The reason I was measuring was to determine the effect of the firewall bushing thickness in this location, as it can affect the "a" dimension by allot.
The energy suspension ones are quite a bit thicker than the rear location.
I will send photos of the areas I am measuring the vertical clearances at. I am 99% sure I have the right points and the rest of the body measurements all correlate really well.
Cheers

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Old 04-01-2020, 06:08 PM
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Ok, here's pics of measurements g though to a, (not including b)
As you can see, d, e, f are all spot on for body alignment.
Body dimension c is miles off as well as a at the front core support location on the frame.
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Old 04-01-2020, 06:10 PM
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And the others.
Pic of subframe mount at firewall shows location of measurement next to master gauge hole.
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Old 04-01-2020, 06:17 PM
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The top of the steel rule is where the published 9_15/16" dimension for location c ends up.
Its nearly at the top of the inner guard mounting flange on the firewall!!!
Somehow I don't think the body of my car is bent up over 3" from the position d to here?
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Old 04-02-2020, 09:53 AM
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Just looking at your pics (didn't look at manual), to me the 'e' and 'd' dimensions are wrong?

The 'c' would basically be the height of the body at the mount location, the 'b' would be the frame dimension height.

9 15/16 - 9 1/16 = 7/8" ?
Seems close to me?

The 'e' spec says the frame is 7/8" from floor?
The 'd' spec says the body is 3 9/16" from floor?


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  #11  
Old 04-02-2020, 04:32 PM
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The measurements are to a datum line, not the floor or a ride height dimension.
I thought that at first as well as 7/8" seemed an odd dimension. At first I held the b and c dimensions, but could not get anything to line up
From the pics you can see that d, e, f, g are a within 1/16" measured to a laser datum line and agree perfectly, so I determined that they were correct.
Yes, the difference between b and c are the combination of the firewall bushing and the frame ear thickness, which makes sense, it's just out by 3" or more??
If someone has a car stripped at present I would really appreciate a check measurement.
A quick one would be to use a straight edge between points d and e (use blocks cut to these dimensions to space the straight edge) and extend it past the firewall mount. Then measure the height to the mount pad.

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Old 04-03-2020, 12:39 PM
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My front end is off right now, as soon as I get the brakes done on the pass side I can get some measurements. It may be a couple of days.

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Old 04-03-2020, 04:08 PM
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Awesome, thanks for that.
This is driving me insane lol.

There maybe something obvious, but i can't handle the fact that I am the only one in the world right now that cant make their car fit the template lol 😂
Unless I am the only one thats ever tried lol

I am looking for 1/16" and finding 3". Grrrrr

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Old 04-07-2020, 03:53 PM
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Is anyone else able to help with a measurement or able to shed some light on this please 😁

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Old 04-08-2020, 09:14 AM
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Sorry to leave you hanging. I was in the shop last night finishing up the brakes on the pass side (thats a whole different story!), I plan on getting the tire back on today after work. I will be able to get the car back on all four feet which will allow me to get some measurements.

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Old 04-08-2020, 04:25 PM
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Awesome. Thanks, was just wondering if anyone else had a car on a rotisserie that would have saved you the trouble 😎

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Old 10-28-2023, 03:35 PM
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Did you find anything out here, struggling with the same problem.OEM 332608 bushing measures 1.05" plus shims? Service manual says clearance of 0.875" c-b, can't believe it compresses that much?

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