| Re: Does "S" shift position have engine braking? [message #365756 is a reply to message #365716] |
Thu, 29 July 2021 09:12   |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma:
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Senior Member |
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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
[Updated on: Thu, 29 July 2021 09:18] Report message to a moderator |
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