Willys Dragon

[STRAT]

While waiting for the foams got some work done on the dash.

[STRAT]

Foams arrived, and mounted, wow what a difference!
I found them this evening when we got back from crawling at the beach.
Sorry for the photos

3 done 1 to go

[STRAT]

[STRAT]

I have a problem thats bugging me since the first test drive. Check the above video #2 at 1:21, you can see as soon as I get in downhill there is slop in the transmission, dont know if it is the pins of the shafts or all the slop from various parts add up and I have a half wheel free turn, just dont want to tear it down again.

[SirChirpAlot]

I can see were slop came in at 1.20 mark, There will always be some slop,
My truck has much same set up. I just changed driveshaft from my tranny to trasfer case due to slop in the U joints.
Now mine almost none. I would say check all shafts and see how they are. I have seen some drive shafts have more play then others.

[STRAT]

Originally Posted by SirChirpAlot

I can see were slop came in at 1.20 mark, There will always be some slop,
My truck has much same set up. I just changed driveshaft from my tranny to trasfer case due to slop in the U joints.
Now mine almost none. I would say check all shafts and see how they are. I have seen some drive shafts have more play then others.

Thanks man, checked this afternoon, I think my slop is from the center transfer case, not sure but I think thats were I have to start looking. Was too hot today and I got lazy, will do maybe tomorrow.

[STRAT]

Got my dampers scaled up





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[STRAT]

Small upgrade.
My transmission plastic casing was done for so I ordered an alloy one.
Removed the steel gears I had and installed them in the new one.
Didnt use the spacers as I needed the plastic guard because my battery tray is screwed on to it.
Changed the bearings also while Iwas at it.
Ready for the weekend.

[STRAT]

Had a 1/10 th winch, and yes I know its a little small, but funds have gone on other projects, so I decided to make it look a little bigger, made a plate 8mm thikness and installed it under the winch.

[TacoCrawler]

While some slop from drivetrain gear lash will always exist...
More so if having internal 32 pitch gears Vs. 48 pitch gears.

The driveshaft universals can be kinda sloppy too...
especially if they are worn somewhat.

So in combination having both faults will create even more slop.

------------

But the number 1 fault of drive train slop (lurch)
is often found at where the axle shaft's insert tabs (tangs)
slide into the locker's outputs.

A loose fitting axle tang into the locker's outputs
will definitely cause your lurch forward and reverse.
Tho' generally most noticed when going down hill.

I'm not sure what locker you are using...
but a Locked Up RC spool has tighter output tolerances then some others.

And is likely why yer roll (lurch) forward occurs @ 1:20

You can check the axle shaft's rotational play (slop) at the locker outputs
by seeing how much one tire rotates while the opposing tire is held stationary.

Ideally there should be minimal play between either side.

A precision locker or spool will have very little rotational variation
between both left and right tires, as one side is rotated.

btw... if the axle's tang fits too tightly in the locker /or spool outputs
that would not be good either.
There has to be a little play so the tang can slide in and out of the lockers outputs.
Or there can be axle shaft bind at the front when turning.

[STRAT]

Originally Posted by TacoCrawler

While some slop from drivetrain gear lash will always exist...
More so if having internal 32 pitch gears Vs. 48 pitch gears.

The driveshaft universals can be kinda sloppy too...
especially if they are worn somewhat.

So in combination having both faults will create even more slop.

------------

But the number 1 fault of drive train slop (lurch)
is often found at where the axle shaft's insert tabs (tangs)
slide into the locker's outputs.

A loose fitting axle tang into the locker's outputs
will definitely cause your lurch forward and reverse.
Tho' generally most noticed when going down hill.

I'm not sure what locker you are using...
but a Locked Up RC spool has tighter output tolerances then some others.

And is likely why yer roll (lurch) forward occurs @ 1:20

You can check the axle shaft's rotational play (slop) at the locker outputs
by seeing how much one tire rotates while the opposing tire is held stationary.

Ideally there should be minimal play between either side.

A precision locker or spool will have very little rotational variation
between both left and right tires, as one side is rotated.

btw... if the axle's tang fits too tightly in the locker /or spool outputs
that would not be good either.
There has to be a little play so the tang can slide in and out of the lockers outputs.
Or there can be axle shaft bind at the front when turning.

Wow, thanks for taking the time to put this down in writing.
I havnt solved the problem fully yet, but been checking at what points I have this slop and found its everywhere a little the lockers, the shafts on the axles, but mostly the shafts on the transmition gears as I remembered the hex bolt pins axial has whernt going through my center transmition and I used a drillbit without measuring the thickness. So I think I need to drill a tab on the shafts of the center gear so the hex bolt can sit lower, I hope this will eliminate most of the slop, not all of it but most. Need to find some time to take it apart and check everything very carefully.
Aha and I have 48 pitch gears.

[TacoCrawler]

Originally Posted by STRAT

but mostly the shafts on the transmition gears as I remembered the hex bolt pins axial has whernt going through my center transmition and I used a drillbit without measuring the thickness.

...glad I can be of any assistance

And so... here's another of my long winded books... Lol

------------

When it comes to slop in the transmission...
assuming you are using the Axial trans...

I would lay blame on the pins located on the top shaft.

One pin is holding the outer spur gear (slipper backing plate)...
and the other is holding the internal (top) gear.

If those pins are too small of a diameter for the slot in the top gear
/or the output (slipper) base...
or the slot(s), the pins rest in, are somewhat too large...
there can be some slop there.

Sometimes larger diameter pins that fit more tightly
can be used to reduce that slop.
But obviously if the pin diameter is too large...
It will not fit into the slots of the top gear or the slipper backing plate.

It's also important that the pins are seating fully into those slots.
If not... then sometimes adding a thin shim can seat them deeper
into those slots of the top gear and slipper backing plate.

Like I said before and you've acknowledged...
...not all of that slop or play can be eliminated.

But the tighter the fit is... the less slop there will be.

I personally still have the factory sintered axle lockers on both my
SCX-10 and Wraith.
And know for fact that most of my play/slop issues lay with those factory lockers.

One day when they have become even worse...
I will be upgrading both of my Axial rigs to the Locked Up RC spools.

But dang... $ 24.00 X's four is not a cheap upgrade.
And the efforts involved to install them...
is something I will likely hold off on doing... until they break or get real bad.

Sadly... the original sintered lockers are junk to begin with...
and were fairly sloppy from day one.

My SCX-10 was an RTR originally (factory assembled)
and the screws holding the locker housing together backed off
and the slop became even more pronounced at the axle.

So I had to disassemble the axle(s) and tighten those screws holding the locker housings/R&P together.
Helped... but didn't remove all of the slop...
Because the factory locker outputs themselves are a sloppy fit to the axle tang ends.

My Wraith was a kit that I assembled...
And while the lockers have stayed secure...
The locker outputs were as equally sloppy as were the locker outputs
on my SCX-10.

Bottom line...

the sintered outputs on the factory lockers suck...
and will round out even more when the vehicle is driven some.

Hence going with the hardened steel ouputs of the Locked UP RC spools.
Their hardened steel outputs will not round out as easily.
And the Axial axle shaft's tang ends seem to be fairly durable.
But most importantly... the tolerances between the output and tang end
is much more precise.

So if the original lockers are upgraded to something stronger...
and the axle shaft's tang ends have not become rounded...
The majority of slop inside the axle's will be diminished.

Once the axles are disassembled
and if ya insert the drive axle tangs into the locker outputs.
if they rotate fore and aft inside the locker outputs...
then the sintered locker is subpar and will eventually become worse.

good luck with finding resolve.

[STRAT]

Thanks , will post if I find the fix, will try to take it apart next week.


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