I want to change the ratio on my 1.5JZ car and haven't been able to find a thread that lists all the possible ring and pinion ratios available (300/400 auto and manual). My car currently has a Chaser R154 tranny and 99 SC400 Auto ring and pinion and needless to say it a highway SCREAMER. By the time the PTB76 turbo spools I'm doubling the speed limit so I want to lower the ratio (or raise it depending on how you look at it) while I'm having my TRD LSD installed. I need shorter gears to get this hair dryer spinning Thanks.

 

Info form clubna-t.com

97-00 SC400 3.266

92-97 SC300
6 cyl, AT (4.27 ratio)
6 cyl, MT (4.08 ratio)

98-00 SC300
6 cyl, AT (4.27 ratio)

92-96 SC400
8 cyl (3.92 ratio)

92-96 MKIV Supra

w/o turbo; (4.27 ratio) Limited Slip
w/o turbo; (4.27 ratio)
w/turbo, MT (3.133 ratio) Limited Slip
w/turbo, AT (3.769 ratio) Limited Slip

97-98 MKIV Supra
w/o turbo; (4.08 ratio) Limited Slip
w/o turbo; (4.08 ratio)
w/turbo, MT (3.133 ratio) Limited Slip
w/turbo, AT (3.769 ratio)
w/turbo, AT (3.769 ratio) Limited Slip

I have attached a gear ratio calculator that might help you once you figure which diff you decide to go with. All you need to do is plug in the diff ratio and the gearing (find on wiki) and it will automatically calculate the speeds for each gear.

 

Thanks.....exactly what I was looking for. I think I need to join NA-T.com.....seems to be a plethora of info over there.

 

so i have a 6spd but the 92-97 sc300 auto tranny gearing. Is it possible to swap it out to the 97+ SC400 gears?

 

Put the gs400 (3.26)

 

Sweet... Thanks for sharing this...

 

Does it matter what year GS400?

 

No, they are all the same and bolt right in.

 

So the GS400 rearend will bolt in in our SC's, but not a LS400?

 

I think it will but no first hand experience.