1987 Chevy Nova Transmission change

1987 CHEVROLET NOVA
145,000 MILES • 4 CYL • FWD • AUTOMATIC
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GPSJR10
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I have the A131L 3 speed automatic trans in my Nova. I was wondering if I can install a different Toyota 4 speed trans in it's place.
Aug 27, 2008 at 9:35 AM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
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The A420 is the 4 speed trans. I am not sure if it was offered in '87.

While it would probably bolt up, the ECM's are different as well as shifting control (TV cable vs. Vacuum).

If you still have the owners manual, check to see if it shows the 4 speed.
Sep 13, 2008 at 5:41 AM
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