One of the most asked questions in the A70 community is about the differences between the R154 found in the turbo MK3 Supra and the W58, found mostly in the nonturbo variants of the supra.

Apart from being weaker than its counterpart, what else makes the W58 different from the R154?

 

Shifter housing differences

In the image: R154 shifter on the left, W58 on the right

Differences as seen from the top:

In the image: R154 on the bottom, W58 on the above.

Front and back differences

Sandwich plate / Bellhouse differences:

In the images:

(Bellhousing of the W58 on top, R154 on the bottom), Bellhousing of the W58 on the left, R154 on the right

W58 width @ sandwich plate ~8.5″ (~21,6 cm)
R154 width @ sandwich plate ~9.5″  (~24,15 cm)

Total length differences

In the image:
W58 overall length (from bellhousing mounting face) ~22.25″ (~56,52 cm)
R154 overall length (from bellhousing mounting face) ~22.25″ (~56,52 cm)

Input shaft differences:
W58 input shaft length ~6.0″ (~15,3 cm)
R154 input shaft length ~6.75″ (~17,15cm)