W58 vs R154 Speedometer Cable Compatibility - Same Cables, Different Trans Gear

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Problem

When swapping from a W58 to R154 transmission (or vice versa), owners are unsure whether the speedometer cables are interchangeable or need to be changed, and may experience inaccurate speedometer readings after the swap.

Uncertainty about speedometer cable compatibility during W58/R154 transmission swapPossible inaccurate speedometer reading after transmission swap

Root Cause

The speedometer cables are identical between the W58 and R154 transmissions. However, the speedometer drive gear inside the transmission differs between the two, which affects the speedometer reading accuracy after a swap.

Confidence

Low confidence — Multiple community members agreed on this solution

View Original Thread →Posted May 2022 on SupraForums.com