This is a good explaination.
I also think that manny means don't use the transmission to slow the vehicle from say 65 to 40, I don't think hes saying to use S to stay at 40mph
________________________________
From: John R.Lebetski
Sent: Thursday, July 29, 2021 9:12 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Does "S" shift position have engine braking?

TH425 has no energy saving era freewheel clutches so it is engaged in all gears, except for converter slip The friction material wear occurs only
during the shift events. Once in a lower gear, there should be no friction material slip i drive it as if it were a manual in mountains. If you rely
on brakes and you use them up with heat soak, then what? I choose the lower gear preemptively, then apply brakes only as needed to limit engine
overspeed with very short applies and long off intervals. I beg to disagree with Manny here (and on disconnecting the GM designed kickdown which I
have connected as stock) as overheating brakes can warp drums and rotors and break down grease leading to future fails. Remember that even Mobil 1
grease is only rated to 305F by Mobil. My trans has just past 100K mark no problems.
The long grade you speak of at 14% is a first gear grade taken below 30 MPH. In S it will run away.
--
John Lebetski
Woodstock, IL
77 Eleganza II
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