Ae101 - Questions On Gearbox, Suspension

[spikesman]

Hi,

Need some advice on '92 AE101 (4A-FE) on LSD gearbox & TEIN HA coilover (Height adjustable type).

1) LSD gearbox (probably from a Lenvin, but not sure actual model)

a) During pickup, if change from 1st to 2nd gear below 20km/h, there is loud "click" sound & I can feel it on the gearknob.

b) When downshifting from 3rd to 2nd gear, there is funny sound. Can feel like there are 2 notches in 2nd gear position. only happen for 3rd to 2nd gear.

c) In 2nd gear, car slows down to about 10 to 15km/h, very difficult to engage 1st gear. But if step on gas pedal in 2nd gear, seems like in wrong gear, the car vibrates & feels like no power until it passes 20km/h. Is it correct to engage 1st gear when the car is rolling at low speed?

Or can tune the distributor timing to solve the vibration in 2nd gear? Tuning the distributor timing can give smoother & more powerful acceleration ?

2) When doing almost full turn or full turn, when i step hard on the gas pedal, the steering wheel vibrates. Anything to do with the gearbox? Heard may need to change gearbox oil, true?

3) When going over uneven road surface (eg. speed limit strips), rear suspension is very bumpy. When there is a drop in the road surface level, can feel like the car bounce 2 to 3 times before it dampens out. Are the springs or shock absorbers gone? Can the shock absorbers in Tein coilovers be changed? Do coilovers generally give very bumpy ride?

Thanks!!