Gear questions for manual transmission cars

TomC25

Platinum Member
Oct 12, 1999
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Why is it that you can be rolling backward and shift into first gear with no problem, but if you are moving at all forward you cannot shift into reverse?
 

HardTech

Golden Member
Oct 9, 1999
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because the first (and all forward-moving gears) have synchros while the reverse gear does not.
 

woodie1

Diamond Member
Mar 7, 2000
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Some cars have syncros on reverse, some do not. You must be driving one without.
 

TomC25

Platinum Member
Oct 12, 1999
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Originally posted by: NightFlyerGTI
You can do anything you want... if the clutch is depressed.

If I have my clutch pushed in, I cannot shift into reverse while moving forward unless I want to grind my gears up.

I guess my car (1989 Probe) does not have syncros.

 

Doggiedog

Lifer
Aug 17, 2000
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Like everyone said, they have synchros so you don't chew up your gears when you put your car into reverse while it's going forward.
 

Jzero

Lifer
Oct 10, 1999
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I have driven '87 Sundance, '94 Escort, '02 Civic. All of them bitch if you try to put it in reverse if you're moving forward because of the synchros.
 

yakko

Lifer
Apr 18, 2000
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No synchros on a gear means you grind while shifting if the car is in motion.
 

NutBucket

Lifer
Aug 30, 2000
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Basically, when you shift a car into reverse, gears have to move past each other; Different scenario then when shifting forward gears. B/C of this, it is harder to shift a car into reverse.
 

Sluggo

Lifer
Jun 12, 2000
15,488
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While the synchros have a lot to do with it, some of the reason lies in the fact that reverse gears are straight cut, while forwards gears are helical cut.

The straight cut gears are also what give out the little whine when you back up real fast.

 

LAUST

Diamond Member
Sep 13, 2000
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Uhhhh... here is a dumb question, why is everyone trying to put their cars in reverse while they are driving forward anyway :confused: ;)
 

PsychoAndy

Lifer
Dec 31, 2000
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Originally posted by: LAUST
Uhhhh... here is a dumb question, why is everyone trying to put their cars in reverse while they are driving forward anyway :confused: ;)

J-Turn Training: What NOT to do, with video! - The next Dateline NBC special
 

LAUST

Diamond Member
Sep 13, 2000
8,957
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Originally posted by: PsychoAndy
Originally posted by: LAUST
Uhhhh... here is a dumb question, why is everyone trying to put their cars in reverse while they are driving forward anyway :confused: ;)

J-Turn Training: What NOT to do, with video! - The next Dateline NBC special
LMAO :)