The Sanwa SDX-801 is an excellent servo indeed, but some drivers feel that 6.5 kg/cm at 6 V may be on the weak side for a 4WD. Sanwa considers this a touring car servo, but it is strong enough for 4WD.
I am one of them who wants a slightly stronger servo and therefore run the Futaba BLS551 in my 511.
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The Tamiya Sheep
Various Tamiyas including TRF201 and TRF511
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