One of the great things about the steering servo in the Rampage is that it is fully covered by Redcat's warranty. If, however, you are looking to upgrade your Rampage's steering servo, my top pick is the Hitec HS 5764MH. The Hitec servo is faster, smoother and quieter than the stock servo and they seam to be extremely reliable.
Unfortunately, I no longer offer them for sale here at RampageShop.com but they are usually available for a good price on Amazon
By the way, if you found this helpful, please use one of the links in this post to order your servo from Amazon and I'll receive a small commission.
Thanks for your support, I really appreciate it.