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does a crawler need a slipper clutch?

Not necessarily.

I run them so my kids don't break as many parts.

If you are runn high volts and/or big motors you'll find the first-second-third weak links in your drivetran, without a slipper. You will fix and upgrade these weak points sooner.
 
If you are not competing with your truck, run one to protect you drive train. If you are competing, I recommend not running one.
 
Sweli and Greatscott hit it right on the money. My first comp, I ran one. That was the last time. I removed it and started the process that Greatscott mentioned, lol. I do still run a slipper on one of my scalers but the others have been beefed up considerably in the drive train. I would want a slipper on any vehicle i got air with often. Such as in a Slash, etc. As it will save alot on landings. But not in a crawler. At least not one in a crawler that hasnt been strengthened in the driveshafts/gears/general drivetrain.
 
My AX-10 kit didn't come with a slipper and I never found the need for one. If you can excercise throttle control not having a slipper allows for a more precise and reliable transfer of power.

However, on my SCX I installed the slipper because of the extra power, speed, and shockloads from airtime that it will be subjected too.
 
As mentioned, slipper clutches are usually needed with rigs that have a lot of wheel speed and get air time, the clutch reduces loads through the drivetrain to help prevent breakage.
Doing "jumps" or "launches" in crawling is usually not an issue needing a slipper clutch.
I don't believe it will hurt running one, but I wouldn't go about getting one if you don't already have one."thumbsup""thumbsup"

Now, if you were doing a FOFF or high powered Rock Racer, that is different and a slipper "may" be worthwhile. Being easy on the throttle during landing would reduce any need for it though.
 
I have a slipper clutch, I tightened it down a little when I had my axial 55t. Now I have my holmes hobbies 35 torque master 540 I twisted my rear drive shaft off rear yoke and then put it back on and twisted it off front yoke. Im running stock driveshafts. I believe it twisted the hole shaft because the line up now twist around shaft and they will not completely slide in. May need to loosen it a tad.
 
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