Originally Posted by Cesar
I never just tried the outdrive but.......
Everthing from the HPI Pro4 differential works for the T-spec .....
If you choose to use the hpi diff the outdrives are too short also, but you can use a small piece of fuel tubing to bring the dog bone out so it fits better.
There is a world of difference between the hpi diffs and the stock ones.
hope thst helps,
Thanks for the info.
I have done it. It works.
I'm using this HPI Parts :
HPI 73514 Pro4 graphite outdrive
HPI 75135 diff outdrive ring
HPI 72105 diff ring D-cut
The D-cut type diff ring plate is smaller than the stock one, so the ball can be seen but still attach to the ring so no problem... I can;t use the stock diff plate since it's to big and different shape with the HPI outdrive. (The stock outdrive more like Tamiya TA04 ball diff plate).
The outdrive has similar size for the stock ball bearing (1510 I think) and it fits tight and perfectly matched so no problem when I re-fitted the gearbox. The length of the outdrive on both side is the same as stock one but since I added the outdrive ring, the dogbones almost touch the ring.. But I can manage them to sit properly by adding some fuel tubing on each side of the dogbone.
The only problem are :
1. the center hole for the diff screw. HPI outdrive is for 2.5 mm and this stock diff screw is 3 mm so I have to drill with 3mm bit. So it's okay for me.
2. because the center diff screw is 3 mm so is the locknut and this become the problem. I can't tighten easily since the small part (take alook at his picture
.... it's the one in the centre, small thing, looks like T-shaped, I don;t know what's the name.) can't fit the 3mm locknut.
So I have to use tweezer (can't use the long nose plier since the tip is too thick to get into the outdrive) to hold it and then using 3mm hex to screw it tight.
I think if the diff loose after some runs then I have to open the gearbox to re-tighten the diff... but I think it's just fine with me...
That's all I can share to you. For the diff, I still use stock ball diff. and so far, it never fails me.