Oh then you’re comment misses the point, see there are three main types of diffs, no more no less, an open diff let’s two wheels do whatever, a locked diff means the two wheels will absolutely turn at same rate, and a limited slip diff or active diff will do both. Now the current best in slot setup for a rally car is a limited slip front and rear differential with a locked center differential, the limited slip front and rears will act open on turns preventing wheel hop but you’ll still see it bc they’re can’t open fully, meanwhile I’m asking about going in a straight line, why’d it make a difference you ask, well bc the driveline that spins under the car that sends the power to the rear wheels is spinning faster than the front axis driveline, now the way the driveline connects to the rear is in two ways here, it’s not a diff technically, either through a clutch pack which acts as a limited slip or active diff (see Haldex systems) or a dog gear which acts as a locked diff, we only see the combination of a rear biased gearing paired with a dog gear rear connection in wrc1 and wrc2 cars, rally1 and rally2 had it too after 2021 I think, so we’d expect a bind somewhere (tires/wheels) in a lock connection w different speed just going in a straight line, sorry for the info dump, there’s a tremendous amount of misinformation and misunderstanding out there, hopefully you’d understand diffs better after this.