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Spec-R Gear diff review

Spec-R Gear diff review

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Old 07-13-2010, 08:21 PM
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Originally Posted by andrewdoherty View Post
At the recent MSRA Beat the Heat race in Memphis I ran 100 wt Losi oil in mine and another front runner ran 1000wt Mugen diff oil. This was on 150 ft straight with unlimited esc 17.5's. I ran the diff with the stock innards, but it leaks after a few runs. I gotta get that fixed. I smeared 6636 AE diff grease on the seals and around the outdrives, but it still leaked after the first day of racing. I heard I should try green slime, but I haven't been able to try it yet. It leaks around the outdrives, but not through the pulley/gasket.
100wt oil not too thin for diff?
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Old 07-13-2010, 09:23 PM
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Originally Posted by kschu View Post
100wt oil not too thin for diff?
losi oil isnt cst rating. 10,20,30 etc . 100 is pretty heavy shock oil
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Old 07-13-2010, 10:13 PM
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Originally Posted by Yokomo_Ant3 View Post
losi oil isnt cst rating. 10,20,30 etc . 100 is pretty heavy shock oil
oh, now i got it..
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Old 07-14-2010, 03:14 AM
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Hi, Can anyone recomend a differant O ring, as im having a little leaking from the outdrive.
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Old 07-14-2010, 04:23 AM
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Originally Posted by kschu View Post
100wt oil not too thin for diff?
I wouldn't run anything that says WT. It's not a true rating. If I use shock oil or diff oil, it's much better stating its CST value. 100WT can mean anything. I purchased an Atomic 34T version that arrived yesterday. As far as I see it, 1000 - 5000cst is the range that should be used by looking at all the messages.

The big problem with my car on carpet is the 'hooking' into tight corners, where the car pivots way too much off throttle and that was with a recomended ball diff set with zero slip and associated grease. I'm pretty sure now, the problem turned out to be that the diff motion was so free that the car off throttle had too much rotation even with a rock hard front end and a spool, so its not always good to have a super free rear diff. I'm sure the diff needs some resistance, so the car doesn't have too much variation on and off throttle.
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Old 07-14-2010, 05:19 AM
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How much do you guys polish the back of the diff gears? and what grade wet and dry are you using? I've just built mine used 1500 wet and dry put it all together with green slime and filled with 1000cst oil and boy is it tight compared to the standard ball diff.
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Old 07-14-2010, 07:16 AM
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Originally Posted by BILKO1 View Post
How much do you guys polish the back of the diff gears? and what grade wet and dry are you using? I've just built mine used 1500 wet and dry put it all together with green slime and filled with 1000cst oil and boy is it tight compared to the standard ball diff.
I did the same as you. Lightly sanded the back of the gears with 1500grit paper and filled with 1000cst oil. It is tighter than a free ball diff, but it shouldnt be much tighter. What you may have to do is loosen the screws so that they're not very tight, just done up until they lock, as I noticed the screws done up very tight made the gears too tight inside.
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Old 07-14-2010, 07:47 AM
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try sanding it with a bit heavier wet n dry, like 800. Thats what i did after sanding it with 1500 and it felt very stiff, then it felt much smoother
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Old 07-14-2010, 09:14 AM
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Mine is on its way, its for my TRF416X which is my Mod class car, I wonder why do you guys sand the back of the gear diff? Any other tips to bulletproof it? Can somebody also post some pics on which exact area to be sanded?
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Old 07-14-2010, 09:24 AM
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Originally Posted by dameetz View Post
I wonder why do you guys sand the back of the gear diff? Any other tips to bulletproof it?
This was literally just discussed in the last 3 posts.
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Old 07-14-2010, 09:59 AM
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Originally Posted by dameetz View Post
I wonder why do you guys sand the back of the gear diff?
We sand the back / flat part of the gears to remove any left over moulding marks the instructions tell you to do this.

Last edited by BILKO1; 07-14-2010 at 06:55 PM.
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Old 07-14-2010, 06:33 PM
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just a thought..

Has anyone tired or thought about filling the diff with plastic polish such as mothers/mequires/novus... running the diff for a few min, then cleaning / rebuild with Oil ?
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Old 07-14-2010, 08:01 PM
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Originally Posted by JasonC View Post
just a thought..

Has anyone tired or thought about filling the diff with plastic polish such as mothers/mequires/novus... running the diff for a few min, then cleaning / rebuild with Oil ?
Step away from the glass.....lol
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Old 07-14-2010, 11:33 PM
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Originally Posted by STLNLST View Post
Step away from the glass.....lol
Reminds of the TC-3 days
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Old 07-15-2010, 01:07 AM
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my gear diff set just arrived... unfortunately without any build instructions. Is it available online or can someone post it? appreciated...
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