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03-14-2012, 09:04 PM | #1 |
Quarry Creeper Join Date: Dec 2006 Location: Acworth
Posts: 265
| Removing the slop from a Summit trans
Here's a mod to remove most of the slop in the Summit trans. Those of you that use them in your SCX-10's and other crawlers know that the worst thing about the trans is when you transition from ascending to descending and the truck rolling about 6-8 inches uncontrollably. Then after stopping, it taking a second to take up the slack before it starts moving again. After this mod your truck will be as tight as having the stock Axial trans back in it. First disassemble the trans by removing the six screws holding the case halves together and removing the shilft lever/spring. While keeping all the gears in the same case halve that houses the spur gear, separate the case. You should end up with this: Next, remove the output shaft along with the 2 gears and the shift drum attached to it. Pay attention to where the shims are on the output shaft. There is a big one on one end and a small one on the other. The gear toward the front of the trans is high gear, the one toward the back is low gear. Front being the side with the spur gear. Remove the low gear and the shift drum from the shaft. Notice that one side of the gear has 2 long slots and the other side has 8 small holes. All the slop comes from the tabs on the shift drum rotating back and forth in the 2 long slots on the gear. Take a saw or dremel and cut about 1/3 of the tabs off the shift drum. Be careful not to take too much and to make clean and even cuts. The result you want is for the tabs to be small enough to fit cleanly in 2 of the 8 holes on the other side of the gear. This is roughly where to cut the tabs: The hard part is done. What you want it to look like: Now take the output shaft with the shift drum on it and put it in a drill. While running the drill, take a dremel and sand one of the lips on the shift drum down about 2mm. Now start reassembly. Install high gear onto the output shaft the same way it was, the shift drum with the uncut tabs facing it. Install low gear onto the shaft flipped the opposite direction so that the 8 holes face the shift drum instead of the 2 large slots. This is how it should look assembled correctly. Notice the size difference in the tabs on the low gear side versus the high gear side. Install assembly back in case making sure the shims are on the output shaft the same way they were. Reassemble trans and mount back in your truck. You're done! Now instead of the tabs rotating back and forth in the 2 large slots on the gear they are locked in any 2 of the 8 small holes. This mod only takes the slop out of low gear. High gear could be done also by cutting the other set of tabs on the shift drum and flipping high gear over. But, I have seen no need to take the slop out of high gear since it is used for high speed driving. My truck still shifts perfectly after months of use with this mod. And, it drives so much better when crawling in low gear. Last edited by TheROOSTER; 09-23-2013 at 08:15 AM. |
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03-14-2012, 09:20 PM | #2 |
Rock Crawler Join Date: Mar 2010 Location: Hampton
Posts: 751
| Re: Removing the slop from a Summit trans
so that is your secret weapon. i am so temped to take the summit trans out and put it in the scaler. i guess i just need to buy another one. great write up.
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03-14-2012, 09:24 PM | #3 |
I wanna be Dave Join Date: Dec 2006 Location: Goin broke losing weight.....
Posts: 2,262
| Re: Removing the slop from a Summit trans
Nice write up. I'm assuming the narrower tabs havent broken yet? That would be my only concern, but those gears are cheap.
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03-14-2012, 09:25 PM | #4 |
Nobody Join Date: Sep 2008 Location: Maine
Posts: 966
| Re: Removing the slop from a Summit trans
Excellent write up. I'm gonna have to give it a try.
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03-14-2012, 09:28 PM | #5 |
Quarry Creeper Join Date: Dec 2006 Location: Acworth
Posts: 265
| Re: Removing the slop from a Summit trans |
03-14-2012, 09:55 PM | #6 |
I wanna be Dave Join Date: Dec 2009 Location: San Francisco
Posts: 2,236
| Re: Removing the slop from a Summit trans
Awesome mod and write up! Very clever, my summit trans will get this treatment for sure!
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03-14-2012, 11:29 PM | #7 |
Rock Crawler Join Date: Jan 2008 Location: Calgary Crawlers, Alberta, Canada
Posts: 617
| Re: Removing the slop from a Summit trans |
04-24-2012, 11:42 AM | #8 |
Looking for new Trails Join Date: Dec 2008 Location: GPS locating signal.....
Posts: 558
| Re: Removing the slop from a Summit trans
Nice step threw I will be doing this soon to my rig.. Thank you for the right up...
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04-24-2012, 07:57 PM | #9 |
Quarry Creeper Join Date: Dec 2006 Location: Acworth
Posts: 265
| Re: Removing the slop from a Summit trans
Your welcome guys!
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05-05-2012, 04:23 PM | #10 |
RCC Addict Join Date: Oct 2009 Location: west coast..
Posts: 1,522
| Re: Removing the slop from a Summit trans
excellent WRITE UP THANKS..
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06-02-2012, 12:06 AM | #11 |
Pebble Pounder Join Date: Feb 2010 Location: yankees suck
Posts: 121
| Re: Removing the slop from a Summit trans |
06-02-2012, 12:47 AM | #12 |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
| Re: Removing the slop from a Summit trans
Can we get a moderator in here to sticky this? This is too good to pass up. Great write up |
11-04-2012, 05:00 AM | #13 |
Quarry Creeper Join Date: Jan 2012 Location: Home
Posts: 296
| Re: Removing the slop from a Summit trans
X2 sticky this mod
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11-14-2012, 06:55 PM | #14 |
Newbie Join Date: Dec 2011 Location: Circle Pines
Posts: 21
| Re: Removing the slop from a Summit trans
Hi how about filing in some of the large holes with epoxy ,this way you all so keep the strength of the larger post
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11-14-2012, 06:58 PM | #15 |
Newbie Join Date: Dec 2011 Location: Circle Pines
Posts: 21
| Re: Removing the slop from a Summit trans
And buy the way it is a very good write up ,very easy to follow
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12-11-2012, 08:17 AM | #16 |
Newbie Join Date: Sep 2009 Location: birmingham
Posts: 34
| Re: Removing the slop from a Summit trans
ooo a new part to my christmas project modifying my summit trans.
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03-17-2013, 04:28 AM | #17 | |
Newbie Join Date: Mar 2013 Location: Guam
Posts: 15
| Re: Removing the slop from a Summit trans Quote:
This is definitely worth a try. I'm guessing you would only have to replace two parts if it doesn't work and you have to go back to stock. | |
03-17-2013, 07:41 AM | #18 |
Quarry Creeper Join Date: Dec 2006 Location: Acworth
Posts: 265
| Re: Removing the slop from a Summit trans
Thanks for the feedback fellas and yes, only 2 parts are modified if you want to change it back.
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03-17-2013, 10:42 AM | #19 |
Quarry Creeper Join Date: Mar 2013 Location: Plymouth
Posts: 211
| Re: Removing the slop from a Summit trans
Excellent write up. How well does it engagethat gear when you do shift now that most of the slop is gone?
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03-17-2013, 07:56 PM | #20 |
www.ottsix.com Join Date: Mar 2011 Location: Albuquerque, New Mexico USA
Posts: 2,050
| Re: Removing the slop from a Summit trans
This is THE definitive work on the subject...very nice!
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