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https://www.rcmart.com/xtra-speed-spring-steel-universal-drive-shaft-set-for-kyosho-1-10-ultima-optima-2016-javelin-xs-om27011-00100843
They sell for about $19
I use them in my new and old Ultimas, My Rampage GP10 , and my Optima.

I have an aluminum front pinion support that will fit that ....

Ive been using Xtra Speed CV shafts in all my new , and resto work. Check RC Mart.
Nice quality pieces at a reasonable price. The rere's will fit too

Resto3.JPG Resto2.JPG Here is the beginnings of my "Resto-Mod" of my Turbo Ultima Original chassis,(of course), original rear bulkhead, and swaybars. Located an original front bulkhead. Rear of the bulhead is all "new" Ultima. CNC motor plate, "rere" transmission with ...

I have a complete Pulsar setup.... Way back when, I got the Duratrax BB conversions for the servos....

I've been running the Ultima kit on my Rampage GP10 since it was new ...... Trying to locate a pair of axles...

I'm attenpting a "mish Mosh" on mine. It has the original Option House belt conversion. I'm going to put the one way front diff, in the original case, the rear will be all new, down to the ball diff....

I'm currently gathering parts for a "Resto-Mod" of my Turbo. Going to use the new Gold shocks, I have a set of "3K" shock towers, sway bars, Going to use the 64mm CVD axles for drive, The transmission will be all "new". Easiest way to get 48 pitch all around, plus a sli...

Here she is as a roller .....

Looks identical to the original. And , yes, they do help, on smooth , high traction surfaces...
Some small adjustment is available, the end links, are hollow, you can move them up and down a small bit, for tuning.

Very nice !
Gathering parts to rebuild my original Optima ... Has an original Option house belt conversion . Going to update to the "new" transmission, just for the slipper and 48 pitch gears. ANd picked u p an original one-way for the front . Will post soon .

Just off the shelf,
Time to clean and tune the old girl.
All the "cool" mods from back in the day . DuraTrax head, pipe and ball diff. Thorp disc brake. Ported the case and sleeve in the CZ-R. Robinson Racing Front caster kit.

Very clever !

I have oneof those Robinson spur adapters.... will dig it out and post a pic later