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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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06-23-2020, 08:08 PM | #1 |
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Final drive for turbo track use (oe toyota 3.90?)
I have a 2013 FRS with 4.10 stock gears. I use the car for time attack/lapping/autox, and have ordered an OS Giken differential for it. I run out of gear on the back straight at my track, and was thinking about going with slightly taller gears to help alleviate the problem.
I see a lot of 8 inch toyota gears for Hiluxes and other truck models. What is the cross compatibility on the 8 inch ring and pinions for these cars? I suspect the is300 units are different from the truck units. Am I basically looking for any 27 spline 8 inch toyota unit? Bottom line, what's the most cost effective way to source a 3.90 R&P which I can install with my new LSD when it arrives? Are there other vehicles which came with the ratio I'm looking for other than the is300? I suppose I should do some googling to confirm the tooth number on the gearset I'm looking for to ensure I'm ordering the correct part, if it ends up being a used Lexus take off or the like. If anyone has done the same swap and could provide any tips it would be super |
06-23-2020, 08:23 PM | #2 |
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What is wrong with the is300 units? An is300 m85 diff with a 3.73 or the m98 with the 3.9 would seriously be your best option. Alternatively, you could get gearing from weir or another company that replaces your 4.10
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06-23-2020, 08:25 PM | #3 |
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It appears I should have searched first lol
https://www.ft86club.com/forums/show....php?p=2861994 An oem solution is what I'm looking for. I might be able to find one in a junk yard even. |
06-23-2020, 08:54 PM | #4 |
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I see how I worded my OP made it sound like I didn't want the is300 unit. That's not the case, just wanted to see if there were other options to widen the search net. In all likelihood an is300 r&p is what I'll end up with. It seems like the weir 86-92 supra r&ps are also compatible and avail in 3.91. The thread I posted above has folks suggesting that's an option.
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The Following User Says Thank You to mhiscott For This Useful Post: | DarkPira7e (06-23-2020) |
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