No, they do technically have a differential. It's the big part that sticks out of the back, on some GM models and Ford, it's even wraps around the engine. Typically on GM applications it's on the 3.8 engines.
Maybe he means an LSD (limited slip differential.)
It most certainly does have a differential which shares the same housing and fluid as the tranny... It'd be pretty hard to turn without it. We've already been through this, silver04rollas.
FWD cars 100% have a differential, otherwise you wouldn't be able to turn very well/at all. I just spent a boat load getting my 93's transaxle rebuilt due to issues with the differential bearings whereas in a traditional RWD car this isn't a huge deal. Posi or Positraction is an old school, namely GM, term for LSDs though I believe they refer to the G80 lockers in the trucks as posi's too. LSDs are rare for them in general and I didn't know you could get one with a 9th gen and the A245E, or I would have put one in said 93. Most common in AWD cars but some FWD cars have them too, almost always with an M/T though like the Sentra SE-Rs and I think some Civic Si.
Quaife makes (or made) it for the Corolla (and Celica,Exige,MR2 Sypder....etc), however I imagine it would be rather complicated and expensive to install as it doesn't seem to be a simple "bolt on" part, but disassembling and reassembling a part of transaxle with the LSD component swapped in within the ring gear.
Would be worth it for the performance benefits, however I imagine the car needs a bit of power to take full advantage.
This is correct. There are actually a couple on MWR; Kaaz, Quaife, OS Giken, TRD. All of which are +$1000 for the LSD on it's lonesome. I will note that they are only for the manual transmissions; C59 and C60.
Install requires the removal and disassembling the transaxle (subsequently the transmission) so case, gears, shafts and well pretty much everything is going to be exposed or needs to be removed.
For the average person it's not really needed. It could be put in if one were to do a full overhaul of a busted transmission. It's more for a racing application than anything.
I would exercise going through performance tires before considering this upgrade and usually would require a forced induction 1ZZ-FE or 2ZZ-GE. or a very wound out naturally aspirated 2ZZ-GE (likely on a bottle).
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