My 86.5 did the same thing with the key but only one of my keys did it so it was no big deal. I think it is something to do with one of the notches on the key getting worn down and letting it slip out. As for the LSD on your rear end that means you have a limited slip differential. As for upgrade I know suprastore sells an adjustable LSD but it is costly.
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1987 supra NA 5 speed
1JZGTE swap
Tokico Illumina 2 and Eibach springs
Tokico pillow blocks
Suspension Techniques front and rear sway bar
HKS super dragger cat-back exhaust plus test pipe
Greddy Profec B spec 2 boost controller
HKS type 1 turbo timer
Supra sport solid steel drive shaft
Walboro 255 fuel pump
JZA70 Front end mod
18" Volk Racing AV3 18x8.5 front 18x9.5 rear
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