What do I have? 40 newb (8 Viewers)

[OlYellr]

So on to a new subject.

Torque steer: with throttle input or aggressive deceleration my 40 has a tendency to point itself where it wants, 100% feels like it’s coming from the rear. It has done this since day 1 of getting it going. It was always manageable. I have all new spring bushings.

It’s borderline dangerous with 300+ horse pressures.

So let’s see what we can dive off into the rabbit hole and find out.

Step one. Retighten all u bolts. Again.

Step two. Hope step one helps

Step three. Drink beer and think about it.



Open to suggestions.

Virtual beer time!

Sooo - how are your springs? Have a cruiser lean?
How is your pinion angle - could worn ujoints etc cause rotation of driveshaft/axle with heavy torque load and then translate to your springs.

And drink.

 

[pb4ugo]

Are you running a locker in the rear?

 

[clrussell]

Virtual beer time!

Sooo - how are your springs? Have a cruiser lean?
How is your pinion angle - could worn ujoints etc cause rotation of driveshaft/axle with heavy torque load and then translate to your springs.

And drink.

Springs are pretty “new” few thousand mile HEll For Stout 4” springs. Doesn’t every cruiser lean?

All new driveshaft in the rear since day one. Freshly checked and lengthened with the swap.

Pinion angle looks pretty, I think it’s 4* which is what I set my t case at when I did the swap. Which is nice because I have no driveline vibes now.

 

[clrussell]

Are you running a locker in the rear?

Yes. And it made it exponentially more noticeable with the stock engine

 

[pb4ugo]

I'm guessing a lunchbox locker.

 

[pb4ugo]

I ran a lockrite for about 10yrs and the torque steer was atrocious. On acceleration the right rear would squat and pull badly, on deacceleration it was exactly opposite. I would anticipate this because I was in control of the throttle. I eventually installed a Detriot locker and for some reason it's hardly noticeable, and quite. I wheel with a lot jeeps, that ran lunchbox's and they had the same characteristics.

 

[clrussell]

I ran a lockrite for about 10yrs and the torque steer was atrocious. On acceleration the right rear would squat and pull badly, on deacceleration it was exactly opposite. I would anticipate this because I was in control of the throttle. I eventually installed a Detriot locker and for some reason it's hardly noticeable, and quite. I wheel with a lot jeeps, that ran lunchbox's and they had the same characteristics.

You’re right. Lunchbox. Aussie brand.

It’s a love hate. I love that it works when it needs to. I love that it was dirt cheap on trade.

I hate it locking and unlocking when it does. It’s definitely annoying at times.

My next rear axle will have something different. Maybe a Detroit style. More than likely a selectable locker of some sort.

 

[Ditcherman]

So on to a new subject.

Torque steer: with throttle input or aggressive deceleration my 40 has a tendency to point itself where it wants, 100% feels like it’s coming from the rear. It has done this since day 1 of getting it going. It was always manageable. I have all new spring bushings.

It’s borderline dangerous with 300+ horse pressures.

So let’s see what we can dive off into the rabbit hole and find out.

Step one. Retighten all u bolts. Again.

Step two. Hope step one helps

Step three. Drink beer and think about it.



Open to suggestions.

Mount a go pro underneath and see what’s twisting? Frame, mounts….?
Also wanna be first in (on this page) to say “links”, haha.

 

[pb4ugo]

You’re right. Lunchbox. Aussie brand.

It’s a love hate. I love that it works when it needs to. I love that it was dirt cheap on trade.

I hate it locking and unlocking when it does. It’s definitely annoying at times.

My next rear axle will have something different. Maybe a Detroit style. More than likely a selectable locker of some sort.

I'm with ya, they're cheap and effective. I've been running a Detroit for probably 20yrs. It rarely makes a noise and has ran flawlessly. I have an arb in the frt. I put it together a long time ago and it sees more work and trail anymore. My other 40 will get a pair of arb's or maybe a Detroit in the rear.

 

[clrussell]

Mount a go pro underneath and see what’s twisting? Frame, mounts….?
Also wanna be first in (on this page) to say “links”, haha.

This is actually a decent idea.

I even have one of those fancy things somewhere. No idea where though but I have seen it recently

 

[cruisermatt]

So on to a new subject.

Torque steer: with throttle input or aggressive deceleration my 40 has a tendency to point itself where it wants, 100% feels like it’s coming from the rear. It has done this since day 1 of getting it going. It was always manageable. I have all new spring bushings.

It’s borderline dangerous with 300+ horse pressures.

So let’s see what we can dive off into the rabbit hole and find out.

Step one. Retighten all u bolts. Again.

Step two. Hope step one helps

Step three. Drink beer and think about it.



Open to suggestions.

It is 1000% your lunchbox locker. It will take you 30 minutes to remove it and your problem will go away

 

[clrussell]

It is 1000% your lunchbox locker. It will take you 30 minutes to remove it and your problem will go away

You’re right, this is an easy solution. I have 2 other 4.11 thirds I could just swap in quickly.

 

[clrussell]

Last night I was able to stretch its legs a little.

It will run 70 with zero effort. Really wish it had another gear at that point but it doesn’t “ need” it.

It is very quiet and harmonically happy at 65.

Hoping to put some real miles on it this weekend.

I don’t love the driver seat position, however I’m going to slide it back a little and adjust that soon.

 

[cruisermatt]

You’re right, this is an easy solution. I have 2 other 4.11 thirds I could just swap in quickly.

You don’t even need to swap the whole 3rd, you can swap the spider gears by just pulling the rear cover and shafts

 

[clrussell]

You don’t even need to swap the whole 3rd, you can swap the spider gears by just pulling the rear cover and shafts

Correct. If I can find my old parts.

I’ll probably just deal with it until I swap axles.
It really isn’t terrible unless you are doing race car things.

Edit - In all reality I don’t need a rear locker currently. Maybe I should just pull it out sometime.