CASTOR ANGLES????? 1983 SFA

4x4Wire Trail Talk Forums: Jeep, Toyota, Mitsubishi, Pajero, Isuzu, Kia, 4WD, 4x4, SUV, Off-Road and OutdoorWire Forums

Print Thread

Rate Thread

CASTOR ANGLES????? 1983 SFA #817183 06/07/07 05:22 AM

Joined: Mar 2007

Posts: 18

Honolulu, Hawaii

4x4_YOTA

Need a Spot

I'm confuz'd(see), FSM says castor angle is 3 degrees, 30' +_ 45'. What does 30 - 45 mean??? I took my truck to Goodyear for an alignment. My castor specs came back as lt frt: 4.94 degrees and rt frt: 5.25. Goodyear says, "specified range" for my truck is 4.25 - 5.75. So, which one is correct, FSM or Goodyear??? Thanks everyone!!! Aloha. <img src="/forums/images/graemlins/confused.gif" alt="" /> Have a <img src="/forums/images/graemlins/cheers.gif" alt="" /> on me....

if u ain't 4 wheelin, whats the sense...

Re: CASTOR ANGLES????? 1983 SFA [Re: 4x4_YOTA] #817184 06/07/07 06:03 AM

Joined: Jan 2000

Posts: 12,153

N. California. USA

4Crawler

Web Wheeler

My '85 FSM shows 2 +/- 1 degree:
- http://www.4crawler.com/4x4/4R_TechInfo.shtml#Steering

30' and 45' mean 30 and 45 minutes;
- 60 minutes in a degree
- 30' = 0.50 degrees
- 45' = 0.75 degrees

If the truck drive's OK, the caster is fine, I think folks run up to 6 degrees with taller tires. Generally you want the caster angle more for taller tires for a little better stability. Too little and you can get death wobble, too much and other things can happen.

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
4Crawler OffRoad - 4x4Wire discount code

Re: CASTOR ANGLES????? 1983 SFA [Re: 4Crawler] #817185 06/07/07 06:30 AM

Joined: Mar 2007

Posts: 18

Honolulu, Hawaii

4x4_YOTA

Need a Spot

thanks, steering is a little heavy while turning and it does not return to straight on its own. An article I read said the cause is too much castor. Thanks again.

if u ain't 4 wheelin, whats the sense...

Re: CASTOR ANGLES????? 1983 SFA [Re: 4x4_YOTA] #817186 06/07/07 06:35 AM

Joined: Mar 2004

Posts: 656

Colorado

CORunner93 Offline

Rock Warrior

" 3 degrees, 30' +/- 45' " mean 3 degree, 30 minutes plus or minus 45 minutes.

The ' (one tick) stands for minutes and " (2 ticks) stands for seconds.

fractions or decimals of a Degree can also be shown as minutes and seconds.....or can be shown as a straight decimal. When the decimal is shown as minutes and seconds, the base 60 minute, 60 second convention is used (60 seconds = 1.00 minutes; 60 minutes = 1.00 degree).

For example:

3 degree, 30 minutes = 3.5 degrees

2 degrees, 45 minutes = 2.75 degrees

4 degrees, 15 minutes = 4.25 degrees

Last edited by CORunner93; 06/08/07 01:38 AM.

'93 4Runner - 3.4L 5VZ-FE, 2" body lift, on-board-air system, custom gauge cluster, rear e-locker, electric fan, custom built front and rear bumpers, sliders, 4,88 gears...all on 33x12.5's.

Re: CASTOR ANGLES????? 1983 SFA [Re: CORunner93] #817187 06/08/07 01:01 AM

Joined: Apr 2000

Posts: 4,230

Roseville, CA, Gateway to the ...

OOP'S

Roll Me Over

Thanks for clarifying that. I always wondered what the heck that meant.

David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"

Moderated by 4Crawler, 4x4Wire, kewlynx

Hop To

4x4Wire Social: