Help!!!
07-12-19, 09:14 AM
#3
The MK3 W58 is a generation of that transmission even less strong than the SC300 W58’s and Supra MKIV W58’s. First off I’d get one of those two rather than the weaker MK3 W58. Also that MK3 W58 will need the 2JZ-W58 bellhousing and its shifter housing isn’t extended as far back as the 1992-1994 SC300 W58’s is... which itself isn’t even as far extended as the W58 tripod versions.
No one really extends those MKIII W58 shift housings anyway. Not when the later SC/MKIV W58’s are out there not requiring modifications to the boxes themselves.
It’s the MKIII R154’s, AR5’s and CD009’s are the gearboxes that get all the gearbox modifying attention and support prior to any SC chassis modification to fit them.
The transmission tunnel on any SC300 automatic chassis will need to be cut into regardless of which generation/style is used.
No one really extends those MKIII W58 shift housings anyway. Not when the later SC/MKIV W58’s are out there not requiring modifications to the boxes themselves.
It’s the MKIII R154’s, AR5’s and CD009’s are the gearboxes that get all the gearbox modifying attention and support prior to any SC chassis modification to fit them.
The transmission tunnel on any SC300 automatic chassis will need to be cut into regardless of which generation/style is used.
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mrmj2u (07-12-19)
07-12-19, 11:30 PM
#5
Absc3, If you want to get your SC300 factory automatic chassis running as fast as possible the best thing to do is to source out another SC300-spec A340E 4-speed auto transmission. Though the chassis is not that complicated in this regard there is a good deal more work you will need to do in order to convert your car to manual.
You haven't even bought a manual transmission yet, correct? So finding a compatible A340 should be the priority if the goal is to just get the car running ASAP.
The trouble with an MK3 W58 is that you will need:
1) To totally custom fabricate a shifter extension housing along with the internal shift arm being match extended also. No one does this with W58's to my knowledge. Or you would have to find the same parts from an SC300 92-94 W58 that are extended from the factory and install those into the MK3 W58.
2) You would need a 2JZ W58 bellhousing to swap on
3) You would need an SC300 W58 manual front driveshaft
4) You would need an aftermarket custom trans mount and crossmember either from Driftmotion or Xcessive Manufacturing (the latter can use the MK3 W58 rubber mount on their custom crossmember)
5) A Marlin Crawler mechanical speedo drive to Toyota 3-wire VSS convertor
6) Likely a swan shifter or if you made a ridiculously too long shifter extension housing an aftermarket straight shifter from driftmotin
7) OEM SC300 manual pedal set or Xcessive Manufacturing aftermarket pedal set for SC's, plus the clutch master and slave hydraulics
8) An SC300 Manual ECU of the correct model year helps for the engine to work at optimum
9) Trans tunnel cutting to accomodate wherever the custom shifter will come up to in your automatic trans tunnel
10) An OEM SC300 W58 clutch kit or some mild aftermarket full face organic W58 clutch kit
And after all of that work you will still have the weakest of all W58's which will be more stressed than it should be in the SC300's weighty chassis. Depending on how you drive it that W58 may or may not hold too well with its aluminum center sandwich plate as opposed to the steel sandwich plate in the later W58's that require no modification to work in an SC. If the MKIII W58 breaks all the additional custom work to that transmission itself goes down the tubes while you look for another W58.
If your most important goal right now is to get your SC300 up and running again the priority should be on either rebuilding your current blown A340E automatic or souring another SC300 A340E automatic that is in good shape for swapping right in.
It will cost you more money and time and troubleshooting to convert to ANY manual transmission in an SC. Yes, it is a common conversion and yes manuals are loved in SC's but the cheapest way out in this instance is to simply replace the blown automatic with another automatic.
And the right way to do a manual in an SC is to get an SC300 spec or MKIV spec W58 which are both strong and require almost no work themselves to fit these cars. That, or jump right to an R154, converted AR5 or converted CD009.
You haven't even bought a manual transmission yet, correct? So finding a compatible A340 should be the priority if the goal is to just get the car running ASAP.
The trouble with an MK3 W58 is that you will need:
1) To totally custom fabricate a shifter extension housing along with the internal shift arm being match extended also. No one does this with W58's to my knowledge. Or you would have to find the same parts from an SC300 92-94 W58 that are extended from the factory and install those into the MK3 W58.
2) You would need a 2JZ W58 bellhousing to swap on
3) You would need an SC300 W58 manual front driveshaft
4) You would need an aftermarket custom trans mount and crossmember either from Driftmotion or Xcessive Manufacturing (the latter can use the MK3 W58 rubber mount on their custom crossmember)
5) A Marlin Crawler mechanical speedo drive to Toyota 3-wire VSS convertor
6) Likely a swan shifter or if you made a ridiculously too long shifter extension housing an aftermarket straight shifter from driftmotin
7) OEM SC300 manual pedal set or Xcessive Manufacturing aftermarket pedal set for SC's, plus the clutch master and slave hydraulics
8) An SC300 Manual ECU of the correct model year helps for the engine to work at optimum
9) Trans tunnel cutting to accomodate wherever the custom shifter will come up to in your automatic trans tunnel
10) An OEM SC300 W58 clutch kit or some mild aftermarket full face organic W58 clutch kit
And after all of that work you will still have the weakest of all W58's which will be more stressed than it should be in the SC300's weighty chassis. Depending on how you drive it that W58 may or may not hold too well with its aluminum center sandwich plate as opposed to the steel sandwich plate in the later W58's that require no modification to work in an SC. If the MKIII W58 breaks all the additional custom work to that transmission itself goes down the tubes while you look for another W58.
If your most important goal right now is to get your SC300 up and running again the priority should be on either rebuilding your current blown A340E automatic or souring another SC300 A340E automatic that is in good shape for swapping right in.
It will cost you more money and time and troubleshooting to convert to ANY manual transmission in an SC. Yes, it is a common conversion and yes manuals are loved in SC's but the cheapest way out in this instance is to simply replace the blown automatic with another automatic.
And the right way to do a manual in an SC is to get an SC300 spec or MKIV spec W58 which are both strong and require almost no work themselves to fit these cars. That, or jump right to an R154, converted AR5 or converted CD009.
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