Good stuff here! I know that the MKIV n/a lsd will bolt in and keep the same gear ratios, but will the TT auto lsd change the ratios?
if you are able to source an LSD in the Supra housing (~$1200), you are at the mercy of the gears. If you buy an LSD unit on its own (as is the thread of this topic), your speedo will not be off so long as you drop it into your same differential housing.
The n/a LSD is ~4.0 gearing. The TT Auto LSD is 3.76 gearing. For reference, the SC300 auto is 4.27, the SC400 is 3.92 until 98 when they went to 3.26 for the five speed auto, and the SC300 manual is 4.08.
If you switch from 4.27 to 3.76 gears, your speedo will read low. In other words, you are traveling 70 when your speedo says you are going ~62mph. It is a simple ratio to evaluate the error. Also, lower gearing means less whips off the line at the expense of the theoretical ability to reach a higher top speed (assuming you have the necessary speed cut controller and the power to get you to Mach 1).
Many American muscle car guys are all about gears. It is very common for Mustang and Camaro guys to tailor their performance by swapping out the gears for top end thrill or neck-snapping launches.
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That's good to know. Are you running a 2jz-gte with the factory 5 speed?
Originally Posted by dejacky
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it has been a while i installed my auto tt lsd in my sc300 5 speed pumpkin... but before to install it on the car the snow stopped me, today it was nice out i went back to install it on and i cant get the two long front bolts to line up with the holes... the 3 number 12 hallen bolts at the back are in but it is still off by a bit at the front... anyone had this problem and solved it?
Okay, my stock diff blew, ordered TRD LSD (Auto) for my 5 sp. now trying to find the part number to 10 bolts that goes in the ring gear. Toyota Spec says not to re install original bolts. Does anyone know the stock number of specification of the 10 bolts?
2001 GS430 BCP:NV/ML,TRD SWB, LTuned Mufflers,Skirts and S/S,19x8.5/9.5 Linea Corse z2s, 2006 GX470 Cypress Pearl NAV/ML/DVD and Goodies 1992 SC300 1JZ/5spd:PTE 6262/550ij/264BC-Cams/429HP on the dyno. 2004 Nissan Titan LE/King Cab 4x4