Thread: GI 2.93 1" gearsets, "Mr Norris' third fist" brace

yeah but I need actual high horsepower cars to test this....

Originally Posted by Turbocharged400sbc

yeah but I need actual high horsepower cars to test this....

Them is fighting words. Haha

Although I'm not a transmission expert, I doubt bracing will make the 7/8" chain much stronger. It can't hurt, and will help a little.

The reason I say this is in my business, we work on turbo snowmobiles making as much as 600HP. We have a chaincase setup that is very similar to the 4t65 transmission.
The stock chains are "silent chains" and are weak. They stretch, start snapping links and then break at 300HP with good traction. The solution is a set of 15 wide Hyvo gears and 7/8 Hyvo style chain.
Which is easily twice as strong. We are able to handle 600HP with that set up for racing application. The factory bearing setup in the chaincase is a "swivel" bearing able to compensate for chassis flex and driveshaft flex. The chaincase is a super weak and brittle magnesium. Very very thin material, around 1/8" thick ... yet it can hold a lot of power.

There are aftermarket mounts that completely eliminate the flex in the chassis allowing for standard bearings to be used. This is no way helped the stock chain hold more power. Hyvo gear setup is still required as it is the chain that is the weakness. A slight amount of flex will not hurt the chain.

So the chain and gear style/size strength is really the weak point in our setups and I think short of a 1" GMR chain, not much will hold the power the turbo cars can produce on the long run.