if you are doing 60 mph in conditions where you think you need diff lock i wouldnt worry about transmission wind up as you will probably total the thing beforethe gearbox packs in.
Why on earth would you not have your c.diff locked at all times on snow?! You will have more control, there is zero risk of wind up on snow AND your center differential will suffer less wear when locked on slippery surfaces.
Too late you will now dig a hole down to it's axles
You need to engage the diff lock before you loose traction and disengage when the difficult bit has been passed
Personally I don't see how you are going to get much wind up with just a centre diff lock on a slightly slippery surface or worse with front and rear diffs locked it is a very different story. For example my front diff is slow to release and makes turning 90 deg on dry or damp tarmac a 7 point turn and the steering is a proper work out and springs violently back to centre or the centre of the new diff centre so almost un drivable on the road