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2015 DCSB unstable at highway speeds

Discussion in '2nd Gen. Tacomas (2005-2015)' started by cjm11083, Dec 17, 2017.

  1. Dec 17, 2017 at 8:35 PM
    #21
    Taco'09

    Taco'09 Well-Known Member

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    Perhaps, but the cam positions will help tell us if there is much left to mess with or its time to lower or even go with different UCAs.
     
  2. Dec 17, 2017 at 8:51 PM
    #22
    nd4spdbh

    nd4spdbh Well-Known Member

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    Stock springs, 5100's at 1.75in setting, surprised you got as much caster as you did to be honest. I forsee UCA's in your future.
     
    Tacotj likes this.
  3. Dec 18, 2017 at 5:00 PM
    #23
    cjm11083

    cjm11083 [OP] Well-Known Member

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    So I looked at my cams today and as you might have guessed, the fronts are all the way in and the rears are all the way out (give or take a little) so the put as much caster in it as they could. So I will either drop my front end down a bit or get different UCA's. If I drop the front I think I might try A different spring while I am at it. Any suggestions on springs or upper control arms?
     
  4. Dec 18, 2017 at 6:17 PM
    #24
    Black Taco

    Black Taco Well-Known Member

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    Rob
    WPB, FL
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    No mods whatsoever!
    I went with Camburg UCA's (Balljoint, not Uniball). Great customer service. No complaints. Also went with TRD springs, so can't help there.
     
    motoxscott likes this.
  5. Jan 7, 2018 at 4:51 PM
    #25
    cjm11083

    cjm11083 [OP] Well-Known Member

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    A little update on my pickup. I had to drive home to Nebraska for Christmas (about 3500 miles total) and this was my first major road trip in the truck since i bought it. I had not done anything to address the steering yet and it sucked to drive the whole way. My fuel economy was dreadful as well, averaging about 15.5mpg between 65-80 mph. At this point I am seriously considering getting rid of the damn thing but when I washed it off today I noticed something curious. Both back tires were considerably worn in comparison to the front (like 15% less tread in 6000 miles). Both tires also looked as though they were on the front of a badly mis-aligned vehicle with the outside edges more worn than the inside and a clear scrubbing pattern across the tread. I think I have a bent rear axle housing. I bought this rear axle off craigslist and was told it was in perfect shape, and immediately after installing it had to replace a wheel bearing. I bet the truck it came out of went for a ride and damaged the rear more than they realized. Anyway I am going to throw the stock open 8.4 back in it this week and see if I notice a difference. Also if anyone has a good rear 8" e-locker rear housing for sale let me know.
     
  6. Jan 7, 2018 at 9:06 PM
    #26
    lynlan1819

    lynlan1819 Well-Known Member

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    New uca's
     
  7. Jan 7, 2018 at 9:17 PM
    #27
    D-Rose

    D-Rose Well-Known Member

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    Devon
    Las Vegas, NV
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    Personally I think these trucks don't drive the best on the highway stock. They kinda wander and if there's a slight wind at all it might blow you off the road. When you add a lift it just makes it worse. I would suggest new uca to up the caster like others have said
     
  8. Jan 10, 2018 at 11:06 PM
    #28
    cjm11083

    cjm11083 [OP] Well-Known Member

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    Put on light racing UCAs last night, set them to max caster and had it aligned today, I told them to give me as much caster as they could leaving the lower cams as close to neutral as they could. I also dropped the front down a notch on the shocks. That resulted in 5.6 degrees of caster (I was thinking it would be around 4.5). I also found out I have about 2 deg of toe in the rear axle so it is definitely bent. I actually love the steering feel but all of that caster brought the rear of the tire to close to the back of the wheel well and it rubs on occasion when turning. The truck is still super weird to drive, the steering is much more relaxed now and ruts dont move the steering wheel any more but any loss of traction and the truck moves around quite a bit without warning and is just super unpredictable. I think the bent rear axle is the root of all of my problems. I am guessing I would have been happy with the truck with stock UCA's and a straight rear axle hosing. I am going to change that out with the stock 8.4 tomorrow and I am pretty sure I will have it fixed. Then when I get the time I will raise the front back up and take out a little caster. Stupid craigs list axle that was in "perfect condition" really screwed me over. I will update after I get the axle swapped
     
  9. Jan 11, 2018 at 6:41 AM
    #29
    lynlan1819

    lynlan1819 Well-Known Member

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    Craigslist is the worst of the worst place too buy anything,along with 99% scammers and cheats like you found out.
     
  10. Jan 11, 2018 at 8:04 AM
    #30
    Troyken

    Troyken Well-Known Member

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    I've had a similar experience with my '13 Off Road DCSB. I had the 5100's at 1.75" for one day. Instantly had low speed vibes on test drive to alignment shop, a Goodyear store with Hunter equipment. After alignment the vibes were still there and the steering return and wandering was terrible. I returned to zero lift the next day, had it realigned and had no further trouble. I also have 2015 springs with a 3 leaf aal in the rear. I have 245/75/R16 Firestone Destination ATs. I had the alignment done on 12/19.Camber L 0.2 R 0.2, Caster L 1.6 R 2.1, Toe L 0.05 R 0.04. Total toe 0.09, included angle L 11.4 R 13.7. All numbers within spec and steering wheel perfectly centered.I drive often on NYS Thruway 3.5 hours each way 55-65 mph. Truck always drives great, no handling issues at all. I missed a tire rotation and noticed feathering on the front tires so I had an alignment done at Mavis earlier in December. Truck had not been aligned in maybe two years. They couldn't print data due to a "broken printer" so I don't know original numbers and the steering wheel was off center afterward. Goodyear fixed it up on the 19th. Those are the numbers I posted here. It has 49k miles on it by the way.
     
  11. Jan 11, 2018 at 10:36 PM
    #31
    cjm11083

    cjm11083 [OP] Well-Known Member

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    With the stock rear axle back under the truck drives really well. I can hit whatever I want in turns and the truck lets me know whats going on without trying to kill me. What a pain in the ass to diagnose. I think I will lift the front back up to the 1.75 or get some different front springs. I need a locker now. If anyone has a ARB or Harrop locker for sale or a good e-locker housing let me know. Thanks for all the help. Also if anyone is putting on new UCA's to get more caster dont be shy with it. At almost 6 degrees of caster my truck drives great. I imagine 4-5 degrees might be a little safer but 1.5-2.5 is definitely not enough. Also if anyone wants to buy a good 8" 3.73 e-locker 3rd I have one for sale, I will even throw in an almost straight but kinda bent axle housing.
     
    DVexile likes this.

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