Shern's W58 to R154 swap thread

[shern]

BACKGROUND

First, I'd like to thank the Club Lexus Community for the wealth of knowledge provided for DIYers.

I purchased a MK3 R154 about 6 months ago for a decent price: $350. I had intentions on tackling the R154 swap this summer. There was no rush since my W58 ran fine. However, a few months ago, my clutch started slipping and my rear main seal started leaking at the same time. Go figure. All of a sudden, the R154 swap was mandatory. However, I pushed it off a few months for Toyotafest and the Dub Show (PHX). I barely got the car home from Dub Show.

DETAILS

As mentioned, I did a TON of pre-work for the swap. With all of the research, here is what I settled on from a parts point of view.

• Used Mk3 7M R154 transmission
• Used MK3 front half drive shaft
• Used Mk3 release hub
• Brand New OEM JZ-R154 flywheel
• Brand new OEM JZ-R154 bellhousing
• Brand new OEM Rear Main Seal
• Brand new OEM flywheel and pressure plate bolt set
• Brand new ACT Heavy Duty Clutch Kit w/ 6 puck sprung disk Model #TS2-HDG6
• Brand new OEM Soarer shifter extension for swan style shifter Thanks Blizzy
• Brand new OEM Mk3 slave cylinder
• Brand new OEM washers, wave washers and clips for throwout bearing
• Brand new OEM Mk3 hard clutch line and hose

SHIFTER EXTENSION

Everybody eyeing the R154 swap into the SC knows the complications surrounding the shifter location. Because my W58 was a pre-96 swan style shifter, the only option for me was to do with right with the Soarer extension. I was able to acquire the two parts to retrofit the transmission to the Soarer extended shifter.

Part Numbers:

• Housing, Shifter 33521-24040
• Control Shift Lever 33570-24010

Here are the two parts and the original lever for comparison:



Here is what the transmission looked like after I swapped the parts in:



SPEED SENSOR

For those that may not know, the Supra MK3 used a mechanical speed sensor with a cable to the speedo cluster. The SC300 uses an electrical speed sensor. Below, you can see the two speed sensors.

The Mk3 R154 has a tiny little external bracket that holds the sensor in, the W58 has the bracket attached



There has been talk on multiple forums about people using the W58 electrical speed sensor on the R154 while creating a bracket to hold it in. That was the original plan for me. However, the number of teeth between the R154 did not line up with the number of teeth on the W58 (33 teeth vs. 32 teeth). Therefore, I decided to use the Marlin Crawler mechanical to electrical speed sensor adapter. Apparently, it screws right onto the mechanical sending unit and converts it to the 3 wire electrical speed sensor wiring on most Toyotas.

Marlin Crawler mechanical to electrical speed sensor adapter



TEAR DOWN

Here is the SC on DONK status without the 30s:



Here is the full exhaust system removed for access to the transmission:



Harbor Freight Transmission Jack! Worth it's weight in gold!