I know it depends on how hard you tighten the gearbox and that it will effect the gearbox.
But with the gear diff it makes no difference to me. If i put the housing together without the screws, it's really hard to turn the layshaft by hand.

I have used no shims on my gear diff, as putting in the same as the ball diff made it feel very tight, now with no shims it spins freely and with a small amount of side to side play.

I have 1 shim either side of the diff,also had it on the bench and ran a pack of lipo's through it at low speed,diff feels fine now and spins quite freely,i would have no issues now taking out on track

one more with gear diff probs. not to good fit, it is to large.

Mines a bit tight, I haven't used any shims the mesh was level without any

diff
 

its slowed mine right down. i have put a 7.5 motor in now in stead of the 10.5 i waz runing :mad:

I showed Adam the problem with the diff today at Worksop today after abit of playing about it was'nt better so he's taken it to take a closer look Hopefully he'll post something in the next few days after taking alook

Hopefully a quick fix for this let down in quality. I ran mine twice today and its still to tight to be happy about it.

Personally i think it is the moulding of the actual gear but Adam has given me his witch is fine. Could it be down to builder error tightening the screws to much witch is putting the gear out of shape ? Carn't see it to be honest but thats the only other thing i can think of other than the moulding being wrong

Mine has one tighter spot during a rotation,
Have they used a different type/spec of plastic since the prototypes with different shrinkage characteristics?

I ran mines today for the second time, much improved over my first run, but it was on a different track. Went up from 3k to 5k oil and made a couple of other changes, also used Nanobytes on the rear (new) and staggers on the front (used) which seemed to help the car. I normally run yellow minipins.

My diff fitted inside the gear case, using both shims on each side as per the ball diff, it appeared to be a little on the tight side at first, but after a few packs, I can't say it is tight anymore.

The car does handle a fair bit different from the ball diff, it feels much heavier but does drive better and I am now able to set my slipper correctly which is something that I was struggling with, as the ball diff was slipping badly, even when tight.

Well got my 210 to the rolling chassis point feels ok just a bit stiff well almost fully turned but tried what someone said try rolling on the floor without the pinion an it rolls freely fly a good few meters

For those running a gear diff, how are your lap times? Better or worse than the ball diff? Why did you switch to the gear diff in the first place?

I tried one round with the gear diff yesterday and it felt really good. I'm down to one shim either side.

The thing is if it is an over tightening issue wouldn't it have been wise to have instructions with hints an tips on parts that need to be to a Tourqe setting associated are good with there instructions there are hint an tips right through them telling u how's best to do it

Seems odd how everyone is having different experiences, sure TD will solve it :D

Report from first test with the gear diff... I had a bad feeling driving the car as the gearbox was turning so heavily. But after reading others who had tried I gave it a go on our sunday training.

After 4 races and lots and lots of training days with the ball diff i've had no problem at all.

But with just one training evening with the gear diff it ended up with a mashed bearing, spreading metal parts all over inside the gear housing causing damage to the idler gear and diff gear :(

This could of course be a coinsidence, but i doubt it. I'm sure it's a result of the heavy resistance the gear diff makes.
I replaced the bearing and assembled the gearbox housing, it still feels very harsh to turn it around.
I've always been impressed by Durango quality, but this time they have made a big mistake :(

As a footnote I can say that I had not the top speed on the straight as I use to have, and the ESC got very hot, that didn't happen before. The tranny felt a bit looser at the end of the training, but still plenty of friction.

It ended up with a damaged bearing, mail to Durango is being send :(

I emailed Durango tec department about the gear diff an they have said the diff requires NO shimming at all

That would be correct. No shims supplied with gear diff kit anyway. No issues with my own gear diff, wee bit notchy when first built but soon bedded in after a few runs and feels very smooth now. No shims and 1000cst.

when you open the gearbox stick the gear diff in one half of the gearbox (with the rest of the gears installed) without any shims and you'll notice it is level with the rest of the gears, adding the shims with only cause this tight friction people are getting.

It's true that no shims should be used. But the problem with friction is because of the gear being to big. Durango is looking at the problem.

What have people used for orings? Are you using the ones that come with the kit or the 330099 orange ones?
Any leakage?

What grease are you coating it with? Black, clear or green slime? Or just soaking them in diff/shock oil under the build

I used the kit ones with Green slime. I also soaked the gaskets in diff oil prior to fitting.

However, I have yet to run it but just standing out of the gearbox on the workbench shows no leaks :thumbsup:

Kit ones, with black grease and soaked gaskets in some shock oil for a while. Running 650cst and no leaking - ran it last sunday for about 8 runs.

Thanks did the soaking and slime.

What did you think of 650? I just built mine with 2000 durango oil, I have 60wt losi oil that is about the same. What are you running on?

I used 2000 WT that's delivered with the 410 diff, mostly because it's the best I had at home.
It's hard to say if that was good or not, as I had big problems with the diff. ESC ran hot, no speed on the straight, bearing in gearbox went to 1000 pieces.

I used the orange Kyosho o-rings, wet them with the diff oil.
The diff itself feels great, no leakage, if only the diff gear was a bit smaller... I've contacted Durango and they are looking into the problem.

Started with 2k but the car felt lazy in the chicanes and tight turns. I went to 1k a liked it a lot. Tried 650 last week a thought it was too light. made the car snatchy and square up to quick. So back to 1k. Suggest you try that. I am racing on med-high grip astro.

Sorry meant to add I am using the Schumacher Ultimate Diff Oil ranges. As long as you have the CST ratings it will be fine whatever you use......

When I turn the outdrives on the bench (in hand) it does feel notchy, is that because it hasn't been run yet and needs a little running in or have I tightened it up too much or something?

mine's the same. I'll race it tomorrow and report back

Mine also feels a little notchy, one side more so than the other. Nothing major though, sure it'll smooth out after a few runs.

Yes mine was notchy in my hand the first time and also in the gearbox. It was fine after a run or two. Also each time I have rebuilt it with new oil the diff will feel fine in my hand (having been run) but still notchy in the gearbox until I give it a run and the diff seats again with the idle gears such is the fine mesh between all the gears. Just make sure there are no big notchy bits when turning the spur/outdrives when the gearbox is in the hand. sometimes it takes me 3 or 4 attempts to put it all back in the gearbox and have it feel someway smooth prior to a run.
One last point. I race on Astro with some sand, and you do need to go round every gear and remove any small traces of sand grains to stop it from feeling even worse. the mesh is sooooo tight you cant even have the smallest of blemishes in any of the gears
HTH

Ran mine for the first time last night. There was a slight notch when I turned the diff by the layshaft but it was fine last night, no overheating or anything.

What oil did you start with Toadeh? I'm gonna try 3k on carpet tonight and see where to do from there

Used 5k in it at Oz. Am running it tomorrow so will know more then mate, was just a quick test to see if the car worked mainly :)

Well running mine for the first time tonight I am running 3k in mine

Ran mine on Tuesday with 2k in it. Felt really good and very quiet. Action a little stiff ...felt like drag brake was on but other than that it was good

I'm unsure if I should start on 3k given how it feels in my hands, but you gotta start somewhere.

Well run mine tonight for the first time used 3k well impressed drove better than I ever thought:thumbsup::thumbsup::thumbsup:

so i have put the gear diff in my 210 but mine to with the gearbox closed is a very tight fit. Do they bed in or is the main gear to big. My sc10 geardiff feels alot loser and a lot smoother then the durango diff