DLuders

In LDD Extended Mode, just type in the "Func" (with no quotes) into the parts palette "Search" box at the top-left corner of the LDD screen; both will will pop up. You will have to recolor them to make them appear in their normal Dark Bluish Gray/ Light Bluish Gray colors.

You didn't say whether you're building a car or truck MOC, or what the scale would be. There was a previous topic that discussed return-to-center steering. The Power Functions Medium motor clips onto the hockey spring. The two yellow gears shown could be replaced by the Lego Clutch Gear.

I wonder how a 30346c01 "Electric, Light Rock Raiders Laser, Complete Assembly" would look on that railgun....

You could pretend that it's got a laser to zap missiles or satellites....

You could probably get a good reproduction from the image posted on Bricker.ru :

Eric will do a fine job, but the folks on this forum are (generally) self-regulating....

Not really -- see this recent Eurobricks topic that addressed the matter.

We're very interested!

Nevertheless, one can wish for it....

@ rockfire421: Welcome to Eurobricks! I think what you want is something like what is shown on staras1967's below. It converts rotary motion to linear motion (much like the reciprocating pistons in old-fashioned steam locomotives):

That claw looks useful! http://www.youtube.com/watch?v=4mGRyfhFm8o

[bUMP] Durant Dent posted this YouTube video of a 16-Cylinder Lego Radial Engine with variable pitch propeller: http://www.youtube.com/watch?v=Dg-JNeunIbU

Here is Sheepo's 4-Speed Sequential Mini Gearbox that z3_2drive referenced:

I would just use a 55615 "Technic, Pin Connector Perpendicular 3 x 3 Bent with 4 Pins" part:

In English, rm8 wrote "Hey. Come on, all the questions you can ask here in the discussions: Vk.com/technic_club ." Use Google Translate if necessary.

Paul Boratko has this compact 5-Speed Transmission with Reverse that would do the trick....

On Rebrickable, you can compare the visual Parts List for the 8284-2 Buggy (first picture below) and the 8063 Tractor with Trailer; it should be easy to subtract the parts used for the trailer portion. Download the PDF Building Instructions for both on this Lego Customer Service website. To me, the construction of both is totally different....

I agree with Blakbird -- it is Plagiarism. There's even a Plagiarism.org website that describes the various forms of Plagiarism. One does not have to be paid to "cross the line" of Plagiarism; it is basically "Submitting another’s work, word-for-word, as one’s own."

Well, OK, how about ssugawara1955's spastic :

@ ATS: You could get some ideas from Mahjqa's Intermediate Power Functions Chassis Flickr photoset:

For future reference, Nathanael Kuipers' Supercar is also on Rebrickable.

Interesting, but where does the quad rider sit? The Power Functions elements take up more room than the original set....

@ Parda: I like how you used your extensive collection of Lego Technic Figures as "crash test dummies" in the video! The "wacky racer" that was constructed with four wheels in a vertical frame seemed to survive the plunge the best!

I wonder which one of Paul Boratko's Lego Technic MOCs would perform the best in a crash test?

[bUMP] Abus709 posted this of "4 lego sets [which] are put to the test and are driven into a wall to test how they perform in a crash. The results are recorded in slow motion for your enjoyment and for proper scientific analysis on how a lego car behaves in a crash...." The 8674 Ferrari F1 Racer 1:8 set (built with Lego Technic pieces) did the best: