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Old 10-02-2004, 08:05 PM   #1
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How do I make a spool?

I'm going to run mod on a tight track, so I need a spool for the Pro 4. No company has begun to distribute a spool for the Pro 4. Can someone describe to me the process for making a spool out of a standard Pro 4 diff? And advice or links would be greatly appreciated. Thanks Chad
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Old 10-02-2004, 08:08 PM   #2
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just fill the diff with supa glue and try to take as mutch of the parts out.................rotating waight oh and buy another diff
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Old 10-02-2004, 08:26 PM   #3
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I wouldn't recommend CA glue, it makes your parts useless afterwards. Here's a pretty good way to "convert" your ball diff to a spool.
1. Remove the diff balls and diff rings.
2. Replace the diff rings with a piece of header card that is cut to the same size (that thin cardboard that the name/price/etc. of a part is printed on)
3. Screw the diff back down really tight.

(Note: there may be another/better way to build this.)

This way, the diff acts like a spool, but if forced, it will give a little, so you don't snap parts. Hope this helps.
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Old 10-02-2004, 08:27 PM   #4
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Thanks for your advice. Is there a way to bolt a diff shut? I've heard of this, but never been told how to do it?
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Old 10-02-2004, 08:33 PM   #5
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Default Spool out already

check out www.teamorion.com they just posted a pro 4 spool that hpi came out with.

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Old 10-02-2004, 08:34 PM   #6
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HPI just released the spool for the Pro4.
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Old 10-02-2004, 08:39 PM   #7
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whats the point of a diff anyway....... what does it do?
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Old 10-02-2004, 08:42 PM   #8
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The diff allows the outside tire to rotate faster than the inside tire to help it turn. The spool locks both tires.
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Old 10-02-2004, 08:44 PM   #9
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cos when you turn a corner the outer wheel has to travel a larger curcumfrence than the inner wheel so the diff alowes the wheels to spin at different speeds when cornering......................................do you get it
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Old 10-02-2004, 08:45 PM   #10
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could insuffcient grease on my diff be causing me to spin around corners........esp when im comnig out of apex........all i hear is a loud squeel and then im turned around lol. Yea i get it 100% ive jsut never really thought of it
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Old 10-02-2004, 08:46 PM   #11
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and a spool is a completly solid shaft with no diff action at all
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Old 10-02-2004, 08:48 PM   #12
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man you guys post quik......................i pack the crap out of my diffs so i dont have to rebuild them all the time but it could be that your diff is to loose
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Old 10-02-2004, 08:53 PM   #13
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Default spool

go to hpi website they are getting ready to realease a spool for the pro 4
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Old 10-02-2004, 08:57 PM   #14
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is alread out look up the page or go to www.teamorion.com
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Old 10-02-2004, 09:04 PM   #15
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so would you put the diff in the front or the back for a tc3
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