Castor Correction - how much? (1 Viewer)

Joined
May 7, 2006
Messages
3,300
Location
Kelowna, BC
Since I installed 35" tires my truck wanders badly on the highway, especially on rutted pavement ( my axle is moved forward 30 mm with OME suspension). Prior to the 35's going on the castor was 0 degrees

The available castor shims seem to be 2.5 degrees and 4 degrees. What angles are people running with 35's ?
 
Joined
Jan 15, 2005
Messages
6,602
Location
Tower of murder, baby.
castor isn't all that critical, as long as you have enough of it.

go with the bigger shims. worst case scenario, you have a degree or two too much, and this causes your truck to drive beautifully on the highway, and track straight. Not really any negatives.

Most cut and turned SOA'd cruisers like to end up with 5 deg positive.

always amazed toyota gives this clunky old buckets only 1 degree of castor...
 
Joined
Sep 28, 2002
Messages
8,031
Location
Kamloops, BC Canada
castor isn't all that critical, as long as you have enough of it.

go with the bigger shims. worst case scenario, you have a degree or two too much, and this causes your truck to drive beautifully on the highway, and track straight. Not really any negatives.

Most cut and turned SOA'd cruisers like to end up with 5 deg positive.

always amazed toyota gives this clunky old buckets only 1 degree of castor...

We had a jeep at NWF and they had negative 7 or 8, this truck was scarey at 80 plus K a hour, hit a bump and it would start swapping really bad...:beer:

Rob
 
Joined
Nov 14, 2008
Messages
470
Location
Canberra, Australia
Models from Jan.1990 to Aug.1999

LEAF SPRING

Caster - Short, Middle, Semi-long: 1°15' ±1° (1.25° ±1°)
Left-right error: 30' (0.5°) or less

Caster - Long (Van): 0°50' ±1° (0.83° ±1°)
Left-right error: 30' (0.5°) or less

Caster - Long (Pickup): 0°30' ±1° (0.5° ±1°)
Left-right error: 30' (0.5°) or less


COIL SPRING

Caster: 4°05' ±1° (4.08° ±1°)
Left-right error: 30' (0.5°) or less


Models from Aug.1999-

Caster - 79 series: 3°35' ±60' (3.58° ±1.0°)
Right-left error: 45' (0.75°) or less

Caster - Others: 4°20' ±60' (4.33° ±1.0°)
Right-left error: 45' (0.75°) or less
 

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