I agree that it would be interesting to hear from anyone that’s tried it.

The 034 model would certainly physically fit in place of the 029 unit. I would imagine that the torque ratio characteristics of the 280mm L51 converter would be similar to the 260mm F38/A85 but it’s unlikely to be a good match on K-factor to the lower torque engine so you’d be better off using the smaller torque converter. The bellhousing is made from the same casting so that wouldn’t be an issue. The remaining differences will come down to shift quality and whatever changes were made to the control system.

Phil