| [GMCnet] Re: Does "S" shift position have engine braking? [message #365758 is a reply to message #365756] |
Thu, 29 July 2021 09:59   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Wear on the "S" clutches can be limited somewhat by matching engine RPM'S
to approximately what they would be in "S" before you engage the
transmission manually.
If your coach lurches and rpm's climb suddenly, you just wore off some
clutch lining. Try to minimize that if possible.
Jim Hupy
Salem, Oregon
On Thu, Jul 29, 2021, 7:25 AM John R. Lebetski
wrote:
> 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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