True that Toyota builds Gibbs' cars for them?

toyota has a different support model than the other three manufacturers. the big three provide parts, money, and technical support to their teams, but does not build and tune engines for most of the teams, if any at all. each team that uses one of those manufacturers generally takes the parts from the manufacturer and builds and/or tunes their own engines. some teams provide engines for themselves and other teams (for example, Roush-Yates/RFR and Yates, Hendrick/Haas-CNC, GEM/RGM)

toyota has toyota racing development (TRD), which has different branches for racing on different continents. TRD USA's Race Division concentrates on series in the US, including NHRA, CART/IRL (or they used to), all three NASCAR series, and more. TRD USA works directly with the teams to produce, build and tune the engines used by all toyota teams (Red Bull, MWR, and BDR in particular). gibbs has a slightly different arrangement in that toyota provides them with parts and support, and gibbs builds and tunes their own engines. of course, information is shared between the two and with the other toyota teams as well. mark cronquist is the man behind jgr's toyota engine development. according to a nascar.com article:

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"To me, the Toyota thing is good for us because they can go and develop something and we can go develop something," said Cronquist, who has headed up the JGR engine program since 1996. "Then we can come together and say, 'Hey, your valve spring is better. Maybe we'll put it in our motor.' And maybe we have some things, that they can look at it, too."

He said Chevy teams usually worked together only on future projects like the RO-7 and on durability engine issues. Otherwise, the teams worked independently of one another. He said he expects the Toyota teams, now that JGR is involved, to work together more to get better results overall.

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How they will do things going forward remains a work in progress.

"We see some good things," Cronquist said. "Our package turned out really well. [Toyota's] package seemed pretty good, too. Now we just got to take ours and theirs and kind of marry the two together and use the best of both of 'em, and see what we come up with there."

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if you remember, jgr was using a package more similar to the standard toyota package (for the most part) up until the all-star race. there, jgr tried out one of their own newer, more experimental engine packages and it didn't go so well. so they went back to the drawing board with TRD to work out the bugs...

the bottom line is that toyota does the major part of the development in conjunction with all the teams, but the main reason that jgr has been dominant and the others not-so-much is not only the people and the talent behind the wheel, but also that jgr develops their own packages, whereas almost all the other toyota teams get their engines directly from toyota motor sales/TRD.

as for chassis, jgr still develops them in-house. in the truck series, all toyota chassis are provided by one manufacturer, but the same is not true in the nationwide and cup series. if you remember earlier in the season, junior finished behind hamlin and busch in a nationwide race and afterwards stated that he noticed some things they were doing to their bodies that jr motorsports might be able to use in the future.

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[Bill] Davis also pointed out that the high performance of Toyota teams in the Craftsman Truck Series should not be compared to what is going to happen in the Cup. He pointed out that Toyota teams in the Truck series have the same chassis and whatnot because only one firm builds the Toyota chassis for the Toyota Trucks. But in the Cup Series, each team is responsible for building their chassis. "We don't have that over here (on the Cup side). Everybody's got different chassis. We haven't had that benefit that we've had in the Truck Series. So you really can't compare the two."

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finally, toyota has devoted not only people but major resources to gibbs alone:

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USA TODAY’s Nate Ryan reports Toyota Racing Development will assign “at least a half-dozen employees to [JGR], including at-track engineers" for the Camrys of Stewart, Denny Hamlin and Kyle Busch. JGR Senior VP/Operations Jimmy Markar said that aligning with Toyota is “akin to growing ‘by 100-plus people’ without hiring anyone.” Ryan notes Toyota is also breaking ground this month on a building north of Charlotte that will open next year as the “hub for 50 chassis engineers."

When Gibbs made the switch to Toyota that included everything: the engines, chasis, etc. Toyota has set up testing facilities and shops for Gibbs and Michael Waltrip Racing. It's more confusing with other teams that use Hendrick engines but with the Toyota teams it is 100% Toyota. Which explains why Kyle Busch has done so well this year with Toyota spending quite a bit of money and research into developing better equipment this year.

you're likely deliberating the hot FR-86, which isn't something like what you defined except for having rwd and a V8. they'd be completely stupid to construct something like that, every person contained in the market to purchase a muscle motor vehicle is going to purchase American.

I doubt that they build them but they build the wheelbarrows that bring in the money to get them built better by engineers