OBD 1 compatibility

[94ram1500]

is a 3:55 to 3:92 gear swap compatible with the OBD 1 ecu? 1994 ram 5.9

 

[Fast69Mopar]

is a 3:55 to 3:92 gear swap compatible with the OBD 1 ecu? 1994 ram 5.9

Yes, there is nothing stopping you from running the 3.92's in the rear axle. The SBEC PCM does not care what gears are in the axles.

What matters is that you have the correct speedometer gear in the transmission. It is very easy to calculate what gear is needed to make the speedo read correctly.

 

[94ram1500]

that's a relief, Thank you very much for your help