02-14-2019, 07:33 PM | #1 |
Newbie Join Date: Jul 2012 Location: Rio Rancho
Posts: 3
| Cross RC - Sloppy Diffs
Just picked up a Cross RC SU-4C. So far its been a quality kit and a fun build. Question to others with Cross kits...do the diffs feel "sloppy"? May not be the best word, but there is certainly more play than in my SCX10. Not side to side, but when you rotate the wheels forward and back. Anything to improve that? TIA Last edited by Flatusboy; 02-14-2019 at 07:41 PM. |
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02-14-2019, 09:06 PM | #2 |
Rock Crawler Join Date: Oct 2009 Location: Upstate NY
Posts: 958
| Re: Cross RC - Sloppy Diffs
I think you may need to shim either the pinion or the diff ring gear, or both. I don't own one of these rigs, but some slop is common among almost any of the RC axles.
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02-15-2019, 06:22 AM | #3 |
Rock Crawler Join Date: Jan 2019 Location: Calgary
Posts: 566
| Re: Cross RC - Sloppy Diffs
Basically the same tolerances apply to an rc as they do to a full size rig. They are far more amplified at 1/10 the scale though. I've never seen an rc that didn't require some of shimming or adjusting, will definitely prolong the life of the gears and housing. |
02-15-2019, 11:26 AM | #4 |
Newbie Join Date: Jul 2012 Location: Rio Rancho
Posts: 3
| Re: Cross RC - Sloppy Diffs
So, it is shimmed properly. The issues seems to be at the axleshaft - spool junction. Lots of play between those 2 parts. |
02-15-2019, 04:05 PM | #5 |
Rock Crawler Join Date: Oct 2009 Location: Upstate NY
Posts: 958
| Re: Cross RC - Sloppy Diffs
Is the axle shaft a solid one piece shaft? If so, is the diff locked to it by pins? I had ordered an Xtra Speed K44 axle set from Ebay for my 70 Blazer build. I ended up with a damaged pinion in the front axle and I found that, not only was it not shimmed correctly, but the hole for the pin the keeps the spool in place on the axle, was over-sized. In the rear, it was drilled correctly, but the front was so loose, it would allow the spool to rotate almost 2 pinion teeth. I found some brass tube that was correct for both the drilled hole and the pin. I don't know how long the brass will hold up, but if it fails, I have some 5mm steel rod that I can make a new one with. Hope this helps. |
02-15-2019, 05:25 PM | #6 | |
Rock Crawler Join Date: Jan 2019 Location: Calgary
Posts: 566
| Re: Cross RC - Sloppy Diffs Quote:
This has always bugged me too, pretty much the only reason I'd go aftermarket on the shafts, and I can't get a definitive answer on what would fix that slop. | |
06-13-2019, 08:41 AM | #7 |
Newbie Join Date: Apr 2016 Location: Cumberland USA
Posts: 17
| Re: Cross RC - Sloppy Diffs
Im looking at a Cross RC kit, but unsolvable slop is a deal breaker. Id be willing to buy upgrade parts to get it tight if thats even possible. Have you made any progress on this? |
06-13-2019, 01:31 PM | #8 |
I wanna be Dave Join Date: Dec 2005 Location: Happiness is a warm AK.
Posts: 12,563
| Re: Cross RC - Sloppy Diffs
If you watch the RC Review video, he discusses the excessive play in the Cross Demon drive train. https://youtu.be/nyPU9g27IEc Fast forward to about the 7:20 mark. |
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