BHB Mod - Did it - Did I do it right?
 

Spent some time making a jig tonight and ended up with something real simple. What I started with wasn't leaving the gear square. Anyways....

My question is this - how do I test the lash? How do I know if I have too much?

We are building two kits, and I don't want to cut the other pinion until I find out exactly how to fit it.

Here's some detailed pics. Hopefully, just like in the other most recent thread, these will help some others too! Huge thanks to the BHB for this mod and all the info provided!.

https://2pbwpq-dm2305.files.1drv.com...&cropmode=none

I'm hoping I didn't ruin this pinion.

https://qp5m4q-dm2305.files.1drv.com...&cropmode=none

This is assembled with the shaft pushed all the way in. Like this, I get the clicky, notchy feeling when rotating.

https://dquyna-dm2305.files.1drv.com...&cropmode=none

This is all the way out. Very smooth rotation, but I'm wondering if it's too far. This is what I need help with.

https://ehqqpg-dm2305.files.1drv.com...&cropmode=none

Re: BHB Mod - Did it - Did I do it right?
 

In BHB's thread, he has a picture of a measurement of the stock pinion and the BHB mod pinion. My numbers were pretty close to his within a few hundredths. That and the pinion should sit pretty flush on a bearing after you shave it. He also has that picture in his thread.

Re: BHB Mod - Did it - Did I do it right?
 

Thanks MTR1514. I'll go pound through that thread.

Re: BHB Mod - Did it - Did I do it right?
 

Thanks so much for the acknowledgement and I appreciate your support ! The modification itself looks like it was done right. Nice improvising. Your issue will be a simple fix. First off you have to make sure that your bearing pack is the exact same length as stock specifications including the plastic spacer.

All additional shims need to be added between the outer bearing face and the inside of the C clip. This will prevent the pinion from horizontal engagement. You'll notice after you add the Shins on the exterior of the bearing that the back-and-forth movement will be eliminated. But make sure your bearing pack isn't larger than the stock Dimensions or the bearings will be compressed and bearings won't spin efficiently.

In the extraordinary event of taking off too much of the haunch a shim can be added before the bearing to build it back down to the proper mess as well but I haven't seen the need for this yet.
If you have any issues let me know. You're going to freaking love this machine!

Re: BHB Mod - Did it - Did I do it right?
 

Oh man.... you're awesome! I think I completely understand.

Add shims between c-clip and bearing to get rid of back and forth movement. Roger that.

Doesn't look like I took off too much material. Roger that. That's a great!

I'm a little lost at why the bearing pack length would not be the same as OEM. Are you referring to different spacers and/or bearings being used? And, if the bearing pack is longer.... what's a guy to do?

6s baby..... we're going it right. Or... is that.... we're doing it super expensive? FML haha.

Re: BHB Mod - Did it - Did I do it right?
 

I just came out to take a look. All makes sense, but, if the bearing pack is taller or shorter than stock couldn't I just adjust by using less shims between the clip and the bearing?

I measured.... 0.085 between clip and bearing when pushed against pinion.

Re: BHB Mod - Did it - Did I do it right?
 

looks like you went a little far. you can shim it back out by putting shims on top of the bearing that the 3 retention screws hold in.

Re: BHB Mod - Did it - Did I do it right?
 

What are you basing that suggestion off of? My pictures, or my measurement number?

If my measurement number, then wouldn't I do as BHB suggested and shim between the clip and the bearing? The Dhawk spacers come with 15mm of spacers. 0.085 equals ~ 2mm if my math is correct (ok... Googles math).

Re: BHB Mod - Did it - Did I do it right?
 

No you got everything right. I was thinking that you used a 3rd bearing as well. O.E.M dimensions are what your looking for in the bearing pack.

* Basically the haunch material removed ends getting reapplied outside of the bearing pack in-between the C-clip. *

6s Rig for sure after a few simple mods.

Re: BHB Mod - Did it - Did I do it right?
 

I've read about the 3rd bearing mod. Is it worth it over the Dhawk metal spacers? In your opinion?

Re: BHB Mod - Did it - Did I do it right?
 

110% it protects the gears in a event of the outer bearing failure and divides work load force.
This is a mod that's been passed down for benefits not to be confused with the HD alternative mod.

Re: BHB Mod - Did it - Did I do it right?
 

Definitely need the driveshaft mod, pinion boot or deflector, Aluminum​ steering center/control link, limiting straps, HR hubs, good bearings and you'll have a killer machine

Re: BHB Mod - Did it - Did I do it right?
 

Sweet - we're getting ready to make a second order of aluminum parts. Already have the steering stuff.

Do we need the drive shaft mod if we have the aluminum hot racing shaft? Guess I should read up on that.

Hubs - on the list.

What bearings for the third bearing mod?

Re: BHB Mod - Did it - Did I do it right?
 

3rd bearing mod just requires another bearing of the same size, 15x21x4mm. And because the 4mm wide bearing is smaller than the spacer, your gonna need extra shims to make up the difference. Like BHB mentioned, in the end the entire bearing pack should equate to the OEM dimensions. And it would be a good time time to upgrade the bearings to something better than stock. I use Fast Eddy bearings myself. Other popular ones are BocaBearings or AvidRC.

Re: BHB Mod - Did it - Did I do it right?
 

Where's a good place to get the shims? We got fast eddy bearings on the way and plan on doing third bearing mod.

How many mm in shims is needed to get back to the oem bearing pack thickness? I already need 2mm to stop horizontal play after the BHB mod.

Does it help to spread out the shims between the three bearings or is it best to stack them all between the last bearing and the c-clip?

Re: BHB Mod - Did it - Did I do it right?
 

Re: BHB Mod - Did it - Did I do it right?
 

Can't make it much clearer :D

For what it's worth, my setup uses less shims and still runs perfectly.

Re: BHB Mod - Did it - Did I do it right?
 

My shims worked out to exactly like BHB's pic for the front bulkhead. The Vanquish rear axle setup with 3 mod bearing, I only needed two 0.2mm shims. As far as getting shims, it looks like most online store are back ordered on those Axial shims till May.

Re: BHB Mod - Did it - Did I do it right?
 

Same here"thumbsup"

Re: BHB Mod - Did it - Did I do it right?
 

I am ready to throw mine back together and do the BHB mod but for the life of me can't find the shims. Not ebay, tower, amain etc. Must be slippin in my research capabilities.

Re: BHB Mod - Did it - Did I do it right?
 

I dont know how valid this is but this website looks like they might have some:

https://hobbiesdirect.com.au/axial-1...s-6pcs-ax31269

On my search in the past, I found a site that let me select the shims and pay for them only to find out the next day they really didnt have them in stock. I did get my money back. This site has them listed for about twice the price though. So maybe they do have them and are price gouging? I'd call first.

Re: BHB Mod - Did it - Did I do it right?
 

We got lucky this week, and found 2 packs of shims, so we are going to measure and do one axle tonight in preparation for the rest.

My questions is: are you guys doing this to the front and rear ends?

Re: BHB Mod - Did it - Did I do it right?
 

Speaking of shortage of shims.... Who would a guy contact to have some made? I mean, I've got metal fab shops all over around me. I just had headers cut and custom fit for my real car..... Having shims made can't be that difficult to accomplish..

Re: BHB Mod - Did it - Did I do it right?
 

Yes, if your using the HD spiral gears for both diffs. And the problem with the HD gears is the mesh in incorrect until you modify them. Then they are perfect.

Re: BHB Mod - Did it - Did I do it right?
 

Well, 12 total shims. 4 for 3rd bearing mod, and 9 to take the slack out between rear bearing and c clip.

There has got to be a washer or shim available outside the r/c car arena....

Re: BHB Mod - Did it - Did I do it right?
 

HD spiral I'm assuming are what comes in the kit? That's what we are using.

Re: BHB Mod - Did it - Did I do it right?
 

Yeah all the new kits have been coming with the new HD spiral gears for some time now. You can google pics for spiral vs straight gears to see the difference. Actually from looking at your pics you definitely have the new HD spiral gears.

Re: BHB Mod - Did it - Did I do it right?
 

Thx for confirming.

We just ordered 36 off ebay. They say they'll be hear Friday. That would be cool if it happens, cause we got a bench of aluminum hot parts and summer is here. :shock: