iirc, most of the 71-76 Riviera ( RWD E-body, the Caddy Eldo and Olds Toro are FWD ) is compatible with the other GM Senior Model series ( B-body, C-body, D-body ) cars.
for instance, a small block LeSabre is the source for an 8 1/2" ring gear rear end that can be used in any of the other Senior series cars. so you can actually get any gear ration you want into a Riv or Electra.
you just have to swap the whole rear housing out. the benefit is that you can get a lot more parts for the small block Regal / LeSabre rear AND you're also spinning less rotating mass. the downside is that it's not as durable as a 9 3/8s rear.
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Vladimir Lenin
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H.H. Goddard, Human Efficiency (1920)
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