F.A.Q.

1. Does the Suredrive™ fit my transmission? What is your transmission?
Refer to Specs. or our Compatability chart.

2. Do the rubber blocks wear out very fast? How long do they last?
It really depends on the application, variables such as extreme misalignment, continuous low rpm operations and/or improper installation. I.e. if rubbers not completely positioned into outer drive receiving pockets can all contribute to premature wear. We recommend that all rubber blocks be changed at your regular transmission service. We have one customer that has 4 Suredrive™ in 2 fishing boats (twin) and has over 28,000 hours on the original set of rubbers and he hasn't had to change them.

3. What is the minimum amount of splines need to mount the Suredrive™ to the input shaft?
The Suredrive™ can be mounted with as little as 20% of the splines left.

4. What is the Suredrive™ made of?
The inner and outer drives are cast from high quality ductile iron or quality steel. The center spline hub is machined from 4140 high nickel steel so it retains it's shape upon removal from the inner spider drive assembly (ductile iron is too soft). Therefore the hub would be very difficult to remove from the input shaft as well as lose it's circumference reducing capabilities upon reinstallation.

5. The Suredrive™ seems to be heavier than the traditional drive plate that I have been using, is that O.K.?
The design of the Suredrive™ makes it heavier than traditional drive plates. The added weight helps to increase the flywheel mass which helps reduce torsional vibration and permits a much smoother operation at a lower idling rpm.

6. Why would I spend more money on a Suredrive™ when I can buy a traditional drive plate for 1/2 the price?
If you look at the cost of replacing a drive plate 1-2 times a year and eventually changing the transmission input shaft, (total cost can be up to $2300) gasket kit, labor for installation, safety factor, (The Suredrive™ always remains engaged) as well as the cost of down time of your vessel and compare it to the cost of a Suredrive™, I think the decision becomes clear.

7. The Vulcan drive coupling has a better torsional vibration dampening system than the Suredrive™ why should I buy a Suredrive™?
Yes, the Vulcan drive coupling has a greater torsional absorption than the Suredrive™, but it still has the problem of premature spline wear. The only product that you will find that will correct the problem is the Suredrive™.