All I should know about suspension before any modification

[oldeskewltoy]

you can start with chassis specs....






I also found this.... in Alldata

section is an overview of the steering, suspension, axles, tires, and brakes available on the 1984 to 1987
model years.

Steering:

Type: Rack and Pinion (power assist optional)
Gear Ratio: 19.4 : 1 (Manual)
Gear Ratio: 17.9 : 1 (Power)
Turning Circle: 31.1 ft (9.5 m)

Alignment, Front Wheel (Unloaded):

Service Checking:

Caster: 2 - 45' (3 - 40') +/- 45'
Camber: 15' +/- 45'
Toe - in: 0.04 +/- 0.16 in. (1 +/- 4 mm)

Service Reset:

Caster: 2 - 45' (3 - 40') +/- 30'***
Camber: 15' +/- 30'
Toe - in: 0.04 +/- 0.04 in. (1 +/- 1 mm)

*** +/- 45' on 4A-GEC

Suspension:

Front: MacPherson strut coil spring
Stabalizer: SR5 21mm/ GTS 22mm

Rear: 4-Link coil spring
Stabilizer: SR5 14mm/ GTS 16mm

Axle, Rear:

Type: Hypoid Gear
Differential Ratio: 3.909 : 1 M/T
4.100 : 1 A/T
4.300 : 1 M/T (GTS)
Ring Gear Size: 6.38 in (162 mm), M/T, A/T
6.69 in (170 mm), M/T, GTS
Lubricant Capacity: 1.1 qt (1.0 liter)
1.4 qt (1.3 liter GTS)
Type: API GL-5, SAE 90, SAE 80W - 90 (extremely cold)

Tires:

Size, Type: SR5 - 185/70 R13 Radial
GTS - 195/60 R14 85H Radial

Brakes:

Type: Power assisted vented front disc, rear drum/SR5, rear disc/GTS

Front: Floating caliper, disc
Rear: Leading and trailing shoe, self adjusting/SR5
Rear disc/GTS

Parking Brake: Mechanically operated on rear wheels
Front Disc Diameter: 9.1 in (234 mm)
Rear Disc Diameter GTS: 9.1 in (231 mm)
Rear Drum Diameter SR5: 9.0 in (228.6 mm)