Originally Posted by
GMPX
The only 8 speed stuff I have seen is for RPO MGG, so maybe what you have is something different. The 'MGG' trans is Aisin and the TCM is too, definitely not GM in house design. T87 means nothing to me but it sounds like GM are offering two 8 speed autos.
I also question why a 6.2L motor 'needs' 8 speeds, marketing departments need something to sell I suppose.
We have a Jeep Diesel with a ZF 8 speed and around town I don't think it ever gets above 6th and with 570 NM of torque from 2,000 RPM it could get away with a 4 speed around town, can't see the 6.2L motor being any different especially when they cruise at 1,100 RPM on the highway in 6th.
None of which changes the fact that we aren't currently working on them.