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Speedometer for 3.91 diff


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16 hours ago, Freude am Fahren said:

Interested. Is there a diff that could potentially go with this?

 

The 1.393 speedometer was intended for the 1976 49-state ‘02 with a 3.90 factory differential, but is now often used, appropriately, with a 3.91.  Although it had a different ring-pinion gear set than the e21 3.91, the ‘02 3.90 was an attempt to regain some of the acceleration lost to emissions controls. I note that someone wrote “3.90” on the seller’s unit.

 

During 1976, however, it was discovered that some 1976 speedometers, such as my ‘76’s, dated March 1976 (first photo below), although stamped 1.393, were accidentally equipped with 1.28 gearing by the factory.  Brief blurbs in early Roundels captured this goof (second and third photos below) and its remedy: an overlay for the speedometer’s face with adjusted speeds.

 

Regards,

 

Steve

 

 

 

 

 

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Edited by Conserv
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