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https://www.ebay.com/itm/NEW-KYOSHO-ULTIMA-Parts-Tree-UT002-Gear-Box-Set-KU11/143468100582?hash=item21675d7be6:g:Xt0AAOSwvCpd6LBt https://www.ebay.com/itm/NEW-KYOSHO-ULTIMA-Slipper-Counter-Gear-48T-KU19/143468100575?hash=item21675d7bdf:g:Q-oAAOSwNlld6LGM https://www.ebay.com/itm/NEW-KYOSHO-ULTIMA-Sp...

http://www.kyosho.com/jpn/support/instructionmanual/legendary/pdf/30625-ULTIMA_ex.pdf Page 3 shows the transmission with it´s numbers. The Transmission housing You have, is UM-3 not UT-002 - Unless You´ve bought in the past year as an UT-002. AND they´re not the same :-D Here´s a link to a discounte...

Bill - I know it´s a lot to take in for an old man But I told You that You´ll need the new transmission housing for the use of the new 2019 steel internals. That still stands.

Here´s a parts list : http://www.kyosho.com/jpn/support/instructionmanual/buggy/pdf/30625-ULTIMA_spop.pdf
You´ll ned the new transmission housing to go with the internals. Different bearing sizes.

Thanks for the story, Bill. But we still need pictures though! :D Regarding the RT Ultima chassis - it´s a no go. This is a modern truck chassis and won´t fit Your vintage Ultima. A graphite chassis is a nice option, both then and now. So if You don´t plan on racing beserk hitting every curb with Yo...

Howdy, The Ultima and the Optima has been re-released so new parts are obtainable. If You want to go brushless with Your Ultima, install a re-release transmission - The input shaft has a slipper. The Optima is not the best base for a rockcrawler, but if You´re really keen on it, clean the diffs and ...

Now that´s something special and well executed.
I would find a more "vintage" looking set of shocks for it?

23605000 is the part number for the RG con rod, so I´d say - no it doesn´t fit.
If it´s just for shelf duty, You don´t need a con rod

22805010 Please consult a manual or post a picture of Your engine and crankcase numbers

Contact Tom on facebook, he´s the Norwegian guy behind that site.
I´ve sent You a PM with a link

It´s so nice, one can almost forget/forgive that it´s shaft driven
Edit - It´s belt driven! Now I really like it a lot

Could it be the size that doesn´t meet the requirements? (to big)

This is Top Notch

Weight distribution? Shot bearing?

Nice rig - driveline sounds smooth.
Well done.