on the page where you don't see garage choose SETUP.  You'll see a choice for REALISM. select either expert or hardcore. Return to the previous page and GARAGE should be available. 

Most of us like to use the HARDCORE realism setting since it gives a better feel and more adjustment. But that is also personal taste. AFAIK the online leagues all use HARDCORE realism as well.

 

This is a mod built to run in NASCAR HEAT. HEAT has no relationship to the Rfactor platform. Mods built for HEAT are not edited nor compiled to work in Rfactor.
Although it is possible to convert the models and graphics files to work between the two games, the physics engine in each game is quite different.

When you run that track in auto pitting the cars flip into there stalls can that be fixed

At WWT track that was the best we could get. The AI's and auto driving pits are kinda "wild" in there indeed. By now, I suggest manual driving pits and a pit window strategy that avoid being there along with AI cars.   

Is that the actual Gateway model for Worldwide Technology Raceway? Glad NASCAR Heat finally has one, instead of that repainted Darlington, am I right? Does anyone remember what tracks were edited for what for the earlier Platinum mods?

Yes....   Worldwide Technology Raceway is the actual Gateway track (converted by The Mask a.k.a JOleg) and never released (until now). 

WOW fantastic job Blaxman