4wd binding bad with tires turned 15 degrees

I'm sorry but there is no way in hell I'd run 4.7s in the front case. Toyota cases just can't handle the torque. Many people have shattered a rear output due to have a doubler. I haven't but I'm sure I will down the road.

 

I e run this setup for years on my Tacoma and have never blown anything in it and I take my beast over hell and back. It's 6000 lbs plus running 41" tires with Dana 60's front and rear. The FJ case is one hell of a strong case compared to the older type chain cases and is stronger than the old Hilux gear cases that the crawler nods are made from.
Now I have seen people blow the output shaft on the lefty which is a Hilux case with the rear portion flipped up side down but I haven't seen anyone yet blow the rear output on an FJ or 2nd gen Tacoma yet. There have been a couple who have broken the inputs on the 1st gen Tacomas but I haven't seen it on the 2nd gens yet. That doesn't mean it hasn't been done yet, I just haven't seen it yet. Ill continue to run my "doubler" in front of my FJ case all day long. Love it.

 

I was gonna say, im not an expert on this shit but what wyatt was saying seemed a bit off. The binding is coming from the front drive shaft wanting to turn at the same speed as the rear even though the front is taking a different direction of travel. There is much less binding in low traction situations because with the open diffs (when turning at a noticeable angle) allows one tire to slip and relieve that stored up pressure. When on pavement there is no loss of traction, thus the tire cannot slip so that pressure is then forced to cause binding. The loss of traction relieves off road most of that pressure caused by the drive shafts spinning at equal speeds. Even in very low traction situations (like snow) if you turn sharp enough the front will still bind on you.


Also much props to you for your experience man! Sure did show your wealth of knowledge in that one!

 

If people are off road at all, they should be prepared for breakage and handling it.

My disagreement is with the word "dangerous". I don't see any danger. The increased risk of rear breakage from torque is produced at the same time mitigating the risk of general driveline breakage from bind due to running in 4wd on a surface that doesn't need it.

Which is greater? Who knows.

Without the control of low gearing, the same rig may be gassing it to get over the obstacle, increasing risk of breakage and loss of vehicle control, which I truly do see as dangerous.

Furthermore, the driver should use skill and judgement to minimize potential damage to the rig. Do you need to be in Lo for this? Locked? Vanilla 2wd may do.

Real world context =/= "what's possible on paper". Yes, some people with modified, hi-torque drivelines have their rigs chew themselves up from the inside out. The majority don't. I don't think "dangerous" applies.

 

You predicted that one. We have gotten WAY off subject here.

OP, as previously stated it does not sound like you have any problem. Tire scrub/driveline bind in 4wd is normal. Of course only a first hand look at your truck could 100% diagnose the issue.

 

so there are no lockers, and the limited slip is weak and doesnt work in four hi. So wouldnt open differential, as it is, solve the binding issue? if it was the traction everyone is quoting

 

Ugh!... No. I swear there should be a class that is required for all new 4x4 owners. This is exhausting.

The sum of the rotational speed of the front axle is always greater than the sum of the rotational speed of the rear axle around any turn. So in 4wd (Lo or Hi) the tires will skid to make up that speed difference.

 

Tell you what, OP. You mentioned you were from Colorado; if you're from the Denver/Aurora area then feel free to bring your truck by my place and I can give it a quick check up and let you know if everything is working as it should.

PM me for details if you're interested.

 

You got it!

 

sounds like an issue, provided your locker is off. considering you have open diffs, mathmatically you will have some bind, but at the same time not enough to worry about, nor notice.

 

You have a differential between your front tires and another one between the back tires. They are both open and allow your front/back tires to turn at different speeds in relation to the other associated front/back tire. However, the binding you feel is caused by the difference in speed between your front tires and your back tires which are connected via the transfer case. The transfer case does not allow for a difference in speed. Both drive shafts turn at the same rate. A center differential is a common method to allow for this variance and is typically only found in all wheel drive vehicles where you can't turn off 4x4.

EDIT: Someone beat me to it while I typing and gettin breakfast! Nice work.

 

Video as promised. I fear the scrubbing is not entirely audible, but the bind is very clear in 4Hi.

http://youtu.be/0bdFT7bvoBE

 

I know I'm late to this party, but I think I have the answer. Having just sold my Jeep TJ I can confirm for the OP that the Toyota does bind more than the Jeep when used in 4wd on the pavement. I don't know why the big difference, wheel base, solid vs IFS, hard to say. But I can also say the Tacoma binds about the same as my old 1978 Chevy 4x4 short bed pickup. I don't think there is a thing wrong with your truck.

 

OMG OMG NOT DRY PAVEMENT!!!!1111


Every needs to chill with an ice cold Slurpee....