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 Alignment after UCA swap
#883934
05/03/08 01:10 AM
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Joined: May 2007
Posts: 435
OP
Mudrunner
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I got an alignment after installing the Gen2 UCA's. My before toe measurements were way off. Spec is 0.08-0.36 degrees. Left was negative 2.07; right was positive 2.56. I wonder if changing the UCA's was the cause? I'm surprised they were so far off, because the truck was tracking fine before the alignment. I could take my hands off the steering wheel and it would keep going straight as an arrow.
The only unresolved issue is right camber. Range is 0.5-1.5 degrees, and I'm at 0.2. So I need to increase camber by 0.8 to get it in the middle of the range. Using a handy-dandy degrees/minutes calculator on the web, 0.8 converts to 48 minutes of adjustment. The FSM says a 1mm shim will provide 13 minutes of adjustment, so I'm about two 2mm shims off, right?
The FSM isn't really clear, but I think I need to add shims to increase camber, correct?
That would put me at 4 2mm shims on that side. Is it OK to have that many shims?
1990 Monty LS 3.0 A/T LWB. KYB front shocks, OME rears and coils. 33x10.5 BFG Muds. 5.29, 2.85, RD110, RD46. 2 bouncys. Aisins. Monte Disco swaybar disconnects. GenII t-arms, idler arm, UCA's, V45W front brakes. 2in BL.
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Re: Alignment after UCA swap
[Re: DirtDriver]
#883935
05/03/08 12:00 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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With 33" tires, you should set camber on both sides at 0*.... or as close as you can get to 0*..... your tires will last longer and handling will improve.
Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: Alignment after UCA swap
[Re: FrankR]
#883936
05/03/08 03:45 PM
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Joined: Jan 2003
Posts: 1,741
Body Damage is Cool
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ya you are better to be closer to 0 with larger tires as said.
87 dodge power ram 50,35" tires,5 1/2" total lift,4.6 gears,lockers front and rear,Rancho RS5000's,custom front bumper,custom rock sliders,cct extended diff breathers,75 amp alt(40 amp stock),thorely header,K&N,wheeled hard...
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Re: Alignment after UCA swap
[Re: powerRam50]
#883937
05/03/08 07:03 PM
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Joined: May 2007
Posts: 4,628
Roll Me Over
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I set mine to 0* camber and it feels great, with even wear on the tires.
Fasteddy's advice is occasionally sound...
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Re: Alignment after UCA swap
[Re: FrankR]
#883938
05/03/08 09:32 PM
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Joined: May 2007
Posts: 435
OP
Mudrunner
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Ok, so I should go for 0* camber. But I'm still confused on the effect of adding or removing shims. If I remove a shim, then the UCA shaft is closer to the frame, and the ball joint is farther out from the frame. Then the top of the knuckle is out farther, tilting the wheel out at the top, increasing camber. So the rule is remove shims to increase camber, and add shims to decrease camber. Do I have that right?
1990 Monty LS 3.0 A/T LWB. KYB front shocks, OME rears and coils. 33x10.5 BFG Muds. 5.29, 2.85, RD110, RD46. 2 bouncys. Aisins. Monte Disco swaybar disconnects. GenII t-arms, idler arm, UCA's, V45W front brakes. 2in BL.
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Re: Alignment after UCA swap
[Re: DirtDriver]
#883939
05/03/08 11:00 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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If I remove a shim, then the UCA shaft is closer to the frame, and the ball joint is farther out from the frame. Then the top of the knuckle is out farther, tilting the wheel out at the top, increasing camber. So the rule is remove shims to increase camber, and add shims to decrease camber. Do I have that right? Yes. <img src="/forums/images/graemlins/kewl.gif" alt="" /> Also, set your passenger side caster about 0.5* more positive than the driver side. Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: Alignment after UCA swap
[Re: FrankR]
#883940
05/03/08 11:56 PM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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How cum?? road camber? driver tilt effect? engine torque?
Not responsible for advice not taken...
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Re: Alignment after UCA swap
[Re: fasteddy]
#883941
05/04/08 12:48 AM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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How cum?? road camber? driver tilt effect? engine torque? Road camber. If the caster is different from side to side, the vehicle will pull to the side with the less positive caster. If the caster is equal but too negative, the steering will be light and the vehicle will wander and be difficult to keep in a straight line. If the caster is equal but too positive, the steering will be heavy and the steering wheel may kick when you hit a bump. Driver weight should be allowed for by cranking the driver side torsion bar until the driver side bumper corner is .25" higher than the passenger side with no one in the vehicle. Engine torque on a stock 3.0L Gen1 is countered by opening a wing vent. <img src="/forums/images/graemlins/wink.gif" alt="" /> Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: Alignment after UCA swap
[Re: FrankR]
#883942
05/04/08 04:16 PM
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Joined: Feb 2000
Posts: 3,269
Roll Me Over
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It may be too late for this but from what others have said and from what I remember of looking at the set In my garage, the mounting shaft on the gen 2 arms, can be rotated 180 degrees. The thought being that the other side is a little bit thicker from the center axis making it easier to get the proper camber without the need for adding as many shimms. Maybe Tag or captn' can chime in on this one.
99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..
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Re: Alignment after UCA swap
[Re: justice]
#883943
05/04/08 05:08 PM
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Joined: Jan 2001
Posts: 3,876
Roll Me Over
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Sorry. I dont recall. I installed mine then took it to a shop for alignment.
89 2dr 3.0 AT, manual hubs. 33x12.5 MT gen 2 coils,Cranked front tbars Dons rocker protection, Front/Rear Bumpers. ARB rear locker, 2" BL, Beefed up skid plates/trailing arms. Gen II uca, 2 Bouncy seats www.youtube.com/TagGeorge
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