| Re: [GMCnet] shift kit pro's and cons [message #317791 is a reply to message #317785] |
Fri, 19 May 2017 08:37   |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma:
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The big problem with user installed shift kits is they cant address int he internal changes needed ( as I remember from my transmission guy ) they can only change the valve body programming.
Stock transmission use clutch overlap to smooth out the shifting, but that means two gears are applied at the same time for a while.
A performance transmission does not do that. It's easier on the transmission, but a bit harder on the rest of the driveline, esp on high performance cars pushing the limits of the components.
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From: Gmclist on behalf of John R.Lebetski
Sent: Friday, May 19, 2017 7:50:59 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] shift kit pro's and cons
The idea behind Transgo and other kits was to speed up the shift event and have less overlap. This in theory minimized the time the clutch packs were
slipping in a sacrificial manner. However this increases stresses elsewhere as the stored RPM energy had to be rapidly disipated. The guys at
Hydramatic were the best in the business at programing-- balancing comfort, drivability, durability and performance. That is 4 vectors kind of like
trying to have the old "balancing eggs on eggs" task work out. They were designed to shift seamlessly imperceptible under light throttle and firm as
loads increased. If you think about it in an 11k vehicle the loads are always high as if towing. Also going to harder shifts is a bad idea with FWD
where uneven traction surfaces can jerk you into another lane with hard shifts.
--
John Lebetski
Woodstock, IL
77 Eleganza II
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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