Gear grinds

englishmike · 10-14-2009, 03:54 PM

When I quickly change gear regardless of what gear, the gearbox will give off an awful grinding sound. When I change gears slowly its ok.

What is the fault likely to be and the cost of repair?

MidnyteRunner · 10-14-2009, 05:58 PM

mine doesnt grind but it seems a lot harder for it to go in gear. i almost have to force it into gear with the clutch pressed down all the way. is this normal?

o6spdracer · 10-14-2009, 06:53 PM

Quote:

Originally Posted by englishmike

When I quickly change gear regardless of what gear, the gearbox will give off an awful grinding sound. When I change gears slowly its ok.

What is the fault likely to be and the cost of repair?

Is your clutch slipping at all?

Quote:

Originally Posted by MidnyteRunner

mine doesnt grind but it seems a lot harder for it to go in gear. i almost have to force it into gear with the clutch pressed down all the way. is this normal?

Flush your transmission fluid and then replace it with a higher quality gear oil. Also check your shifter cables and shifter bushings.

YellowJacket · 10-14-2009, 10:11 PM

Quote:

Originally Posted by o6spdracer

Flush your transmission fluid and then replace it with a higher quality gear oil.

+1
Redline MT-90 has a very good long-standing reputation. You will need almost 3 quarts. And take the fill bolt out before the drain bolt - just in case

o6spdracer · 10-14-2009, 11:36 PM

Not if its a Turbo MK2 that is close to 4qts.

MidnyteRunner · 10-14-2009, 11:47 PM

Quote:

Originally Posted by o6spdracer

Is your clutch slipping at all?

Flush your transmission fluid and then replace it with a higher quality gear oil. Also check your shifter cables and shifter bushings.

i forgot to add that this only happens when im reving my car high. driving casually, it goes into gear smoothly

YellowJacket · 10-15-2009, 07:48 PM

Quote:

Originally Posted by o6spdracer

Not if its a Turbo MK2 that is close to 4qts.

Its not... its a mk1a

o6spdracer · 10-15-2009, 07:53 PM

Ok...That is like the worst, when you go get 'everything' you need and then go back and realize you didn't get enough to get the job done. Keep us posted and let us know if the problem diminishes or goes away.

YellowJacket · 10-15-2009, 08:16 PM

True! Thats why I suggested to take the fill bolt off FIRST.... I have read stories of guys taking the fill bolt off LAST and then discovering it being stuck and being in a pickle after their car has NO tranny fluid in there.

MR JAS · 10-16-2009, 06:36 AM

ok none has actually answered the original question yet
the problem is you have worn syncros (very commom)
they rub together to slow the gears down or speed them up so they are spinning at exactly the right speed so they mesh with out hitting at different speeds

as you rev higher the speed difference is greater so the lack of syncro is more apparent
norm it shows on the downshift into second first this can be somewhat remedyed by a good oil (MT-90) and double clutching down shifts

but all in all the only way to get it properly fixed is tear the box down and replace them

Raptor13x · 10-16-2009, 07:21 AM

Yep, worn synchros. They are quite expensive to have replaced, so it's not really worth doing unless it's *really* bad. Other than that you can try replacing the trans fluid with some good stuff like Redline MT90- that can help, but the only way to fix it entirely is by a rebuild.

Sh0ty · 10-20-2009, 06:51 PM

Definitely try the MT-90, but also look into replacing the shift cable bushings. If there's enough slop, the cables won't move the transmission far enough into gear. I replaced mine today and it cured my second gear grind.

10-14-2009, 03:54 PM	#1 (permalink)
englishmike Some Skills Join Date: Sep 2009 Location: Birmingham, Alabama Posts: 85 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Gear grinds When I quickly change gear regardless of what gear, the gearbox will give off an awful grinding sound. When I change gears slowly its ok. What is the fault likely to be and the cost of repair?

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10-14-2009, 05:58 PM	#2 (permalink)
MidnyteRunner Newbie Join Date: Aug 2009 Location: Garland TX Posts: 265 Thanks: 1 Thanked 2 Times in 2 Posts My Google Map iTrader Rating: (1/100% )	mine doesnt grind but it seems a lot harder for it to go in gear. i almost have to force it into gear with the clutch pressed down all the way. is this normal?

10-14-2009, 11:36 PM	#5 (permalink)
o6spdracer Nothing Clever Join Date: Jan 2007 Posts: 2,187 Thanks: 1 Thanked 112 Times in 107 Posts iTrader Rating: (1/100% )	Not if its a Turbo MK2 that is close to 4qts.

10-15-2009, 07:53 PM	#8 (permalink)
o6spdracer Nothing Clever Join Date: Jan 2007 Posts: 2,187 Thanks: 1 Thanked 112 Times in 107 Posts iTrader Rating: (1/100% )	Ok...That is like the worst, when you go get 'everything' you need and then go back and realize you didn't get enough to get the job done. Keep us posted and let us know if the problem diminishes or goes away.

10-15-2009, 08:16 PM	#9 (permalink)
YellowJacket 1985 16v NA 6-speed Join Date: Sep 2008 Location: Nashville, TN Posts: 415 Thanks: 8 Thanked 31 Times in 24 Posts iTrader Rating: (1/100% )	True! Thats why I suggested to take the fill bolt off FIRST.... I have read stories of guys taking the fill bolt off LAST and then discovering it being stuck and being in a pickle after their car has NO tranny fluid in there.

10-16-2009, 06:36 AM	#10 (permalink)
MR JAS Generous to a fault Join Date: Apr 2009 Location: hamilton new zealand Posts: 722 Thanks: 19 Thanked 17 Times in 16 Posts iTrader Rating: (0/0% )	ok none has actually answered the original question yet the problem is you have worn syncros (very commom) they rub together to slow the gears down or speed them up so they are spinning at exactly the right speed so they mesh with out hitting at different speeds as you rev higher the speed difference is greater so the lack of syncro is more apparent norm it shows on the downshift into second first this can be somewhat remedyed by a good oil (MT-90) and double clutching down shifts but all in all the only way to get it properly fixed is tear the box down and replace them

10-16-2009, 07:21 AM	#11 (permalink)
Raptor13x Legendary Join Date: Apr 2006 Location: Farmington Hills, MI Posts: 3,997 Thanks: 7 Thanked 44 Times in 37 Posts My Google Map iTrader Rating: (5/100% )	Yep, worn synchros. They are quite expensive to have replaced, so it's not really worth doing unless it's really bad. Other than that you can try replacing the trans fluid with some good stuff like Redline MT90- that can help, but the only way to fix it entirely is by a rebuild.

10-20-2009, 06:51 PM	#12 (permalink)
Sh0ty Armchair Racer Join Date: Aug 2008 Location: Novi, MI Posts: 1,273 Thanks: 22 Thanked 57 Times in 54 Posts My Google Map iTrader Rating: (3/100% )	Definitely try the MT-90, but also look into replacing the shift cable bushings. If there's enough slop, the cables won't move the transmission far enough into gear. I replaced mine today and it cured my second gear grind.