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You would need to carefully consider the gear ratios available and the speed range that you require.
Other things to consider would be reversing. A high speed, high voltage motor would more then likely have advanced brush timing and so may not reverse well.
Also, is the diff on a live axle or is it an independent suspension set up?
If you mount the motor on a live axle then it will be additional unsprung mass and the motor and its mounting to the axle will be subject to a lot of road shock and vibration.
An independent suspension set up would lend itself much more easily.
I came across a race diff that had quick swappable gear ratios and a reversing gear so the diff could be run in either configuration. With hindsight the maker would have been useful but I neglected to check as I didn't need one and it was too costly for my possible requirements.
Other things to consider would be reversing. A high speed, high voltage motor would more then likely have advanced brush timing and so may not reverse well.
Also, is the diff on a live axle or is it an independent suspension set up?
If you mount the motor on a live axle then it will be additional unsprung mass and the motor and its mounting to the axle will be subject to a lot of road shock and vibration.
An independent suspension set up would lend itself much more easily.
I came across a race diff that had quick swappable gear ratios and a reversing gear so the diff could be run in either configuration. With hindsight the maker would have been useful but I neglected to check as I didn't need one and it was too costly for my possible requirements.