Torsion Bar nomenclature

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scott657

scott657

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My Left is 347 right is 477 I'm assuming that is .8347 and.8447. Probably going to look for something a bit more substantial
 
Are you sure about those numbers?

First off, torsion bars should be the same diameter left and right. Second, the number on the driver's side bar should be odd, the passenger side should be even. If they're both odd numbers then you have two driver's side torsion bars, and that's not good. Third, the numbers don't correspond to the diameters. A 447 bar has a diameter of .081, that's actually a drag race bar, smaller even than a /6 bar (.83"). I can't find a reference for a "347" bar, but that doesn't necessarily mean that isn't what you have.
 
The 347 could also be a date code, these are bars from a AAR Cuda 130 = 13th week of 1970, 778 - 779 are .900 diam

T-bar.JPG
 
Just bought a set 891 and 892 boy this board is fast. and the knowledge is excellent
 
according to the charts I have 890, 891 are .850 and 892, 893 are .870
891 and 892 would be a mismatch.
 
scott657 said:
I measured the bar and it was almost perfect to the .8447 theory
Click to expand...

That's nice and all, but Mopar never made a .8447 A-body torsion bar. brian is right on, I would guess the numbers you listed are the date codes.

This is the best guide I have for relating the ID #'s, part #'s and diameters. The rates listed in this one are calculated by the author of the chart though, and don't match the rates that Mopar actually published officially. The difference is probably that these were calculated with a generic constant for spring steel, while Mopar actually used the exact constant based on the metallurgy of the bars. Either that or the author of this chart used a slightly different length for the LCA which is totally possible if it was measured. Again Mopar would have had the exact number.
Screen Shot 2017-02-18 at 11.35.33 AM.png


This is a great list of the part #'s and rates, this is the Mopar published data for the rates. But of course it doesn't list the ID #'s on the bars themselves, and it's missing the .85" bar.
torsion_bars.jpg


Here's another list, this one shows a few of the bars with ID #'s, diameters, and some of the measurements, as well as the factory paint stripe color you can find on the OE bars.
torsionbarcolor.png
 
72bluNblu said:
That's nice and all, but Mopar never made a .8447 A-body torsion bar. brian is right on, I would guess the numbers you listed are the date codes.

This is the best guide I have for relating the ID #'s, part #'s and diameters. The rates listed in this one are calculated by the author of the chart though, and don't match the rates that Mopar actually published officially. The difference is probably that these were calculated with a generic constant for spring steel, while Mopar actually used the exact constant based on the metallurgy of the bars. Either that or the author of this chart used a slightly different length for the LCA which is totally possible if it was measured. Again Mopar would have had the exact number.
View attachment 1715019348

This is a great list of the part #'s and rates, this is the Mopar published data for the rates. But of course it doesn't list the ID #'s on the bars themselves, and it's missing the .85" bar.
View attachment 1715019344

Here's another list, this one shows a few of the bars with ID #'s, diameters, and some of the measurements, as well as the factory paint stripe color you can find on the OE bars.
View attachment 1715019345
Click to expand...
That should be a sticky, great info.
 
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