I have an 89 gtu parts car. Does it have lsd, and should I switch out the diff with the one on my 87 gxl?

Any info would be greatly appreciated.


261,000 miles on chasis and still and rollin'.

 

gtu does not have lsd
if you weight them the lsd is a lot heavyer
if you pick the car with a floor jack, both the tires from the back, neutral
spin on tire the other on should spin if not spin it the other way

if the other tire did not spin it's probally not lsd

just floor it let the clutch go at 4000 if the car just jumpes out as soon as the pedal is released it lsd if it takes a second or two no lsd
also changing gears, thats how I can tell