A stock manual box will just about last forever behind a 4G32. From what I understand the 4 speeds are quite robust, and that its the 5's that are a little fragile but only behind something with a lot of torque (like a 2.6)
The most popular gearbox option seems to be a Toyota supra box with a custom bellhousing.
Only worth the expenditure if you're punching big numbers.
For what its worth I'm running a stock 4 slotter behind a 4G63 twin cam in my coupe and its holding up fine. It was a bit shagged before the motor went in but it doesn't seem to be getting any crunchier.
The trick will be finding one. There's plenty of 4sp kicking around, but narrow block short length 5sp are a little more scarce (namely because those who have them won't let go of them)
I assume you know about the differences between narrow and wide block boxes? If not, hit that search button.
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