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The Manual Says: 1st gear at 40 mph?!

 
Old 06-10-2019, 07:07 PM
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KingCorvette93
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Default The Manual Says: 1st gear at 40 mph?!

The manual says that the transmission will allow 1st gear to be selected up to 40 mph. This sounds crazy to me! Seems like it would be very hard on the transmission.

Sometimes I will shift to 1st at less than 10 mph. But 40 mph?!

Does anyone actually rev-match downshift into 1st at speed? Any use for this, perhaps in autocross?
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Old 06-10-2019, 08:09 PM
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Dave S
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Originally Posted by KingCorvette93 View Post
The manual says that the transmission will allow 1st gear to be selected up to 40 mph. This sounds crazy to me! Seems like it would be very hard on the transmission.

Sometimes I will shift to 1st at less than 10 mph. But 40 mph?!

Does anyone actually rev-match downshift into 1st at speed? Any use for this, perhaps in autocross?
States the tranny "will allow".....doesn't state you should or must do that!
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Old 06-10-2019, 08:40 PM
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KingCorvette93
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Originally Posted by Dave S View Post
States the tranny "will allow".....doesn't state you should or must do that!
True
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Old 06-12-2019, 09:40 PM
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rabrooks
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Are you sure it isn't referring to using 1st gear up to 40 mph before you shift out to second gear. I never shift into first until I am stopped or very near stopped.
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Old 06-12-2019, 10:18 PM
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KingCorvette93
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Originally Posted by rabrooks View Post
Are you sure it isn't referring to using 1st gear up to 40 mph before you shift out to second gear. I never shift into first until I am stopped or very near stopped.
Positive! First gear goes up to roughly 55 mph! (base, 2010)
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Old 06-13-2019, 11:08 AM
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Mike's LS3
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It all depends on multiple of 1st. gear ratio of the transmission and rear differential gearing as to what the maximum speed of 1 st. gear will be. For example: On manual equipped transmissions, Z51/GS have a 2.97 first gear, the Base/Z06 2.66 and the ZR1 2.29. Multiply trans gearing with the differential gear of 3.42 and the mph limit of first gear will differ between combinations. Same goes for the automatic transmissions. So the upshift or downshift speed of first or any gear will vary among the transmission/deferential gear multiples.

Upshifting limit will be protected by fuel cut off, however downshifting too soon can be catastrophic! Yes, when downshifting, rev matching is a good thing for both street and track.

Last edited by Mike's LS3; 06-13-2019 at 07:14 PM.
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