Hpi Pro 4

I am working with my friends at MakerSpace to come up with an exact copy of the Pro4 gears (bevel gears inside the diffs and conical gears to match) using their CNC milling machines. We plan to try different materials (i.e. Aluminum, Hard Plastics, Brass).
Tech Master

MikeR-Pro4 spool is 2mm too narrow for Evo5
I think that could be shimmed easily.
I think that could be shimmed easily.

As promised- the floating servo mounts are in!

Very nice, will place an order soon. Perfect timing since my new motor arrived for USGT.
Tech Apprentice

Got the new products from Exotek for my Pro 4. Very looking forward to seeing the car on the track.
May I know from you all which 44mm DJ CVDs are using? HB or any other brands? Would the DJ CVDs from HB Pro 5 fit then? That CVD is 44mm too. Much thanks!
May I know from you all which 44mm DJ CVDs are using? HB or any other brands? Would the DJ CVDs from HB Pro 5 fit then? That CVD is 44mm too. Much thanks!

Hi, I am using these. Expensive but lasts for many years

HB 67699 DCJ Drive Shaft Set
Possible the PRO5 dcj may work but may be a while before they can be found.
Tech Apprentice

67699 if you keep watch on Ebay you can get them for cheap. I remember a seller that sold me several for $9 each.
I have 2 sets of the TCXX upgrade pack DCJ and it uses a 2mm pin on the outdrive. Its the same part number for the PRO5
I have 2 sets of the TCXX upgrade pack DCJ and it uses a 2mm pin on the outdrive. Its the same part number for the PRO5
Tech Apprentice

Thanks for your advice! I might get a bit confused that what pin size of the DCJ should I go with the Exotek Pro 4 spool then?

The excessive price of the HB 67699 made me go for Spec-R DCJ. Reliable and affordable... You can go with the TCX ones (with 2.5mm pins) or the Tamiya ones (with 2mm pins), the both are 46mm long

Hi All,
A bit of good news- we finally met our target for the spool and diff sales so the v2 top plate has gone into production! Hope to have a couple dozen in stock later next week.
Thanks!
A bit of good news- we finally met our target for the spool and diff sales so the v2 top plate has gone into production! Hope to have a couple dozen in stock later next week.
Thanks!


I just noticed you sold out on the conversion, awesome to see people with the car still upgrading. Just curious, how many kits did you make?
Last edited by goots; 04-21-2015 at 08:59 PM.


I just noticed you sold out on the conversion, awesome to see people with the car still upgrading. Just curious, how many kits did you make?

does anybody make the cups that the center shaft sit in in aluminum ? any help would be great