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Hey everybody,

I have this cool old direct drive type tranny, for the RC10. I think it is Trackmaster, but not 100% certain.

Getting to my question: What exactly was this type of tranny best used for? And why? Thanks for any help.

Scott

i know somebody else knows about the use more than i. but see them referred to more in regards to oval racing than anything else.

Used for dirt and some places on asphault race tracks. A t times mounteed backwards for more of a mid motor setup.That was a help in balancing weight.
A few places run on carpet,my favorite is dirt, hope this helps,GRIZZLY

The only application that I really know of was as everyone else stated, oval racing. I am sure Doug can give everyone the low down. I think they are cool myself, stick it in one of your HT conversions then throw it on the shelf.

Most TrackMasters were belt drives, and not many were direct drive, so it's something that definitely wasn't seen often.

Direct drive was very oval oriented, for sure. Dirt oval guys loved the TM diffs, for the smoothnesss that they applied the power down. The biggest problems with DD trannies are that you need to use a large spur gear and a VERY small pinion to get a decent drive ratio for most modified motors. In doing that, the drive axles wind up sitting up really high in the CG, and put the dogbones at a real severe angle towards the rear outer half-shafts. It made for almost as much driveline friction as running a smooth gearbox.

I have a belt drive version at home, and it's a novelty today. It might go in a Bomber car (old school gold tub with a late 50's sedan body) I'm building for dirt oval, if I can find some better lower mounting plates than it has right now. There are better diffs out there of that era, though. It did find it's way into A LOT of dirt oval cars in the '80s.