Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

LS1 Grinding into 6th

johnno010684

New Member
Joined
Sep 18, 2008
Messages
552
Reaction score
1
Points
0
Age
36
Location
Auburn
Members Ride
VX Clubsport M6, Subaru Brumby-daily, TM Magna
Hey guys, i have been having trouble with my vx clubby for a while, when changing into sixth it will feel like its slotted in but it will grind so i put clutch back in, and put it into sixth again and no worries. it only use to do it occasionally before now it does it nearly everytime!! has anyone had this problem or have any ideas?
 

TonyJZX

Member
Joined
Jul 25, 2010
Messages
557
Reaction score
3
Points
18
Location
East Coast
Members Ride
Commodore M6
i think i've used 6th a handful of times to see if it actually exists

i think you have two choices

service the gearbox with a flush (transmax-z or penrite mgo 70 is good but expensive) and see if it gets better

i would assume you would have to pull the box out and open it up to really fix it ($$$)

or just live with it
 

johnno010684

New Member
Joined
Sep 18, 2008
Messages
552
Reaction score
1
Points
0
Age
36
Location
Auburn
Members Ride
VX Clubsport M6, Subaru Brumby-daily, TM Magna
yeah true, clubby diff ratio is different than ss m6's to make 6th more useable, i use it doing 80kmh sometimes. any ideas on how to do a gearbox flush/oil change over?
 

bogan_vk

New Member
Joined
Aug 10, 2009
Messages
728
Reaction score
4
Points
0
Location
australia
Members Ride
commodore
it could possibly be the syncro gone in 6th gear if it grinds into that gear
 

macca33

Member
Joined
Oct 9, 2005
Messages
56
Reaction score
0
Points
6
Location
The 'gul, Vic.
Members Ride
VX Senator 300
Yep, using 6th at 80kph under load WILL result in you breaking something. 5th and 6th gears use some plastic components, believe it or not and if you place them under too much strain, being plastic, they break.

Try changing the fluid to Penrite MGO70 (Manual Gearbox Oil 70) and see how it comes up. You may simply have to live with it, or get it rebuilt - entirely up to you in the end.

6th gear is only good for 100kph+ - even in an HSV.

cheers
 

db_notso

diagnostic technician...
Joined
Oct 2, 2010
Messages
979
Reaction score
7
Points
0
Age
33
Location
sunshine coast, qld
Members Ride
vt v6, mods(susp brakesetc...)
plastic???
never noticed is it baker lite?
any way sounds like sixth gear synchro is binding up box out rear case off synchro
but if not enough experience with boxes get it rebuilt

soryy my memorys a little fuzzy on internals normaly we send them to get done
as we dont have the time to strip and assess internal damage

i think the sixth gear sits behind rear internal plate on these as an overdrive gear? i cant remeber exactly
 
Top