A coiled tubing injector, comprising: a plurality of chains (102, 104), each of which is comprised of a continuous loop, carrying a plurality of grippers, mounted on at least two, spaced-apart sprockets (108, 110), at least one of which is a drive sprocket; the plurality of chains (102, 104) being arranged for gripping tubing placed between the plurality of chains (102, 104); the plurality of chains (102, 104) comprising at least two driven chains; and a drive system coupled with the at least two driven chains (102, 104) for turning each of the at least two driven chains (102, 104) independently of the other, the drive system including at least one motor (142, 144) and means for reducing, in the event at least two of the at least two driven chains (102, 104) begin to turn at different speeds indicative of at least one of the at least two driven chains (102, 104) slipping with respect to tubing placed between the plurality of chains (102, 104), the difference in the speeds wherein the drive system further comprises a plurality of motors (142,144), each of which is coupled to the drive sprocket (108,110) of one of the at least two driven chains (102,104), each motor (142,144) being independently operated; wherein the means for reducing comprise for each of the at least two driven chains (102,104), an auxiliary hydraulic motor coupled with each of the at least two driven chains (102, 104), the auxiliary hydraulic motors being connected in series with each other in a hydraulic circuit; or an auxiliary electric motor coupled with each of the at least two driven chains (102, 104), the auxiliary electric motors being coupled for transfer power between the auxiliary electric motors; and a control circuit for limiting transfer of power between the auxiliary electric motors until a certain voltage differential is reached. a plurality of chains (102, 104), each of which is comprised of a continuous loop, carrying a plurality of grippers, mounted on at least two, spaced-apart sprockets (108, 110), at least one of which is a drive sprocket; the plurality of chains (102, 104) being arranged for gripping tubing placed between the plurality of chains (102, 104); the plurality of chains (102, 104) comprising at least two driven chains; and a drive system coupled with the at least two driven chains (102, 104) for turning each of the at least two driven chains (102, 104) independently of the other, the drive system including at least one motor (142, 144) and means for reducing, in the event at least two of the at least two driven chains (102, 104) begin to turn at different speeds indicative of at least one of the at least two driven chains (102, 104) slipping with respect to tubing placed between the plurality of chains (102, 104), the difference in the speeds wherein the drive system further comprises a plurality of motors (142,144), each of which is coupled to the drive sprocket (108,110) of one of the at least two driven chains (102,104), each motor (142,144) being independently operated; wherein the means for reducing comprise for each of the at least two driven chains (102,104), an auxiliary hydraulic motor coupled with each of the at least two driven chains (102, 104), the auxiliary hydraulic motors being connected in series with each other in a hydraulic circuit; or an auxiliary electric motor coupled with each of the at least two driven chains (102, 104), the auxiliary electric motors being coupled for transfer power between the auxiliary electric motors; and a control circuit for limiting transfer of power between the auxiliary electric motors until a certain voltage differential is reached. an auxiliary hydraulic motor coupled with each of the at least two driven chains (102, 104), the auxiliary hydraulic motors being connected in series with each other in a hydraulic circuit; or an auxiliary electric motor coupled with each of the at least two driven chains (102, 104), the auxiliary electric motors being coupled for transfer power between the auxiliary electric motors; and a control circuit for limiting transfer of power between the auxiliary electric motors until a certain voltage differential is reached.