CMS-GT4
Active member
Sticky this one please.
I will post what I learned about 185 and 205 models. Someone else will have to elaborate on the 165.
This link has specs and ratio info on gearboxes.
http://www.celica.dds.nl/en/celihist.htm
All models used a 5speed manual.
4 Gear boxes in all.
All gtfour models had a center VC (viscous coupling) lsd, except for early Japanese 165 models that had a manaul locking center lsd. It had a switch in the cabin.
165 and 185 models came standard with open front and read diffs.
185 models had optional rear torsen lsd but can only be indentified by opening the lsd.
You can learn more about torsen and VC lsd's at this link.
http://www.rallycars.com/Cars/4wd_turbo_cars.html
185 RC/CS/GA and 205 models came standard with rear torsen lsd.
They all have open front lsd and center VC lsd. There is a rumor that the WRC 205 uses a front lsd, but there is not proof as of yet.
There are lsd suppliers for the alltrac.
185/ 205 lsd's are interchangable while the 165 needs modification to use thier lsd. I have heard it needs other rear axels, but I am unsure.
MR2 LSD Conversion for front LSD
We have found that the Mr2 lsd may fit by fabricating a center shaft that has a smaller make end to fit the mr2 lsd. Stock mr2 lsd is VC. This may be a good option for those who rally as VC front and center seems to be a popular choice for rally cars.
Torsen and clutch type lsd's are also available for the MR2 that should fit by the same means as the stock mr2 lsd.
I am going to investigate if parts from the alltrac front diff might be used to modify the mr2 lsd rather then make a new shaft.
GtFout lsd options
Front /Center:
Quaife makes a front torsen type lsd for the gtfour.
http://www.quaifeusa.com/
TRD made a center and front lsd combo for the gtfour that has been discontinued. I have been told by a few rally drivers, one who claims to own one that it is a VC unit. It is a listed as a clutch type, which is a possibillity. Being that they are so hard to find, and expensive at that, they are most likely not an option, and stock center VC will be retained.
Rear:
Cusco and TRD produce rear lsd for the 185 and 205.
Cusco can be obtained through Japan parts.com I have heard good things about them, but never used them myself. Use at own risk.
http://japanparts.com/shop/shop.cgi?mod ... 7s%2fDiffs
Rear torsen from 185 RC or 205 models will be a good upgrade for a standard 185 open rear.
I have read that adding a front lsd can cause understeer, depending on how it is set. From reading the Subaru forums, it seems front and rear clutch lsd cars w/ center VC have a tighter setting for the rear lsd then the front to maintain oversteer.
Supra rear lsd swap:
Another option I read about on http://www.specialstage.com/ is using a rear (lower ratio) supra diff and modify the output of the diff to accept the alltrac axels thus changing the front and rear ratios casing oversteer. If that is a possiblilty then all of the supra lsd options would work for the rear end and give more possibilities. One possible issue is the center diff may over work due to front and rear moving at different speeds and may ruin the center VC. This has yet to be determined.
Gear Sets:
http://www.quaifeusa.com/ Makes a close ratio gear set for the alltrac.
There area couple of other companies that have produced gear sets in the past, I am still looking for their info.
Anyone add what ever useful (factual info) they may have.
I will post what I learned about 185 and 205 models. Someone else will have to elaborate on the 165.
This link has specs and ratio info on gearboxes.
http://www.celica.dds.nl/en/celihist.htm
All models used a 5speed manual.
4 Gear boxes in all.
All gtfour models had a center VC (viscous coupling) lsd, except for early Japanese 165 models that had a manaul locking center lsd. It had a switch in the cabin.
165 and 185 models came standard with open front and read diffs.
185 models had optional rear torsen lsd but can only be indentified by opening the lsd.
You can learn more about torsen and VC lsd's at this link.
http://www.rallycars.com/Cars/4wd_turbo_cars.html
185 RC/CS/GA and 205 models came standard with rear torsen lsd.
They all have open front lsd and center VC lsd. There is a rumor that the WRC 205 uses a front lsd, but there is not proof as of yet.
There are lsd suppliers for the alltrac.
185/ 205 lsd's are interchangable while the 165 needs modification to use thier lsd. I have heard it needs other rear axels, but I am unsure.
MR2 LSD Conversion for front LSD
We have found that the Mr2 lsd may fit by fabricating a center shaft that has a smaller make end to fit the mr2 lsd. Stock mr2 lsd is VC. This may be a good option for those who rally as VC front and center seems to be a popular choice for rally cars.
Torsen and clutch type lsd's are also available for the MR2 that should fit by the same means as the stock mr2 lsd.
I am going to investigate if parts from the alltrac front diff might be used to modify the mr2 lsd rather then make a new shaft.
GtFout lsd options
Front /Center:
Quaife makes a front torsen type lsd for the gtfour.
http://www.quaifeusa.com/
TRD made a center and front lsd combo for the gtfour that has been discontinued. I have been told by a few rally drivers, one who claims to own one that it is a VC unit. It is a listed as a clutch type, which is a possibillity. Being that they are so hard to find, and expensive at that, they are most likely not an option, and stock center VC will be retained.
Rear:
Cusco and TRD produce rear lsd for the 185 and 205.
Cusco can be obtained through Japan parts.com I have heard good things about them, but never used them myself. Use at own risk.
http://japanparts.com/shop/shop.cgi?mod ... 7s%2fDiffs
Rear torsen from 185 RC or 205 models will be a good upgrade for a standard 185 open rear.
I have read that adding a front lsd can cause understeer, depending on how it is set. From reading the Subaru forums, it seems front and rear clutch lsd cars w/ center VC have a tighter setting for the rear lsd then the front to maintain oversteer.
Supra rear lsd swap:
Another option I read about on http://www.specialstage.com/ is using a rear (lower ratio) supra diff and modify the output of the diff to accept the alltrac axels thus changing the front and rear ratios casing oversteer. If that is a possiblilty then all of the supra lsd options would work for the rear end and give more possibilities. One possible issue is the center diff may over work due to front and rear moving at different speeds and may ruin the center VC. This has yet to be determined.
Gear Sets:
http://www.quaifeusa.com/ Makes a close ratio gear set for the alltrac.
There area couple of other companies that have produced gear sets in the past, I am still looking for their info.
Anyone add what ever useful (factual info) they may have.