Gear Shifting Problem on Corrugations
Submitted: Saturday, Sep 08, 2012 at 21:40
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Member - kwk56pt
I am experiencing difficult gear shifting while travelling over corrugations. I have tried shifting slowly and doubling the clutch but it is either difficult to shift or crunches. the problem goes away when the track becomes smooth. I have made sure the clutch pedal is being pushed to the floor and that it is not being restricted by the floor mat.
The vehicle is a 2005 GU 4.2 Ute with 92000kms. Anyone had this issue or can offer some suggestions on what to
check apart from the fluid level.
Thanks Peter
Reply By: Member - Bucky - Sunday, Sep 09, 2012 at 08:12
Sunday, Sep 09, 2012 at 08:12
Peter
How long since you have replaced, or checked the oil level ?
We too have done many haevily corrugated roads, and never had an issue.
Consider
1) what tyre pressures are you running ?
2) what speed are you driving at ?
3) when exactly are you trying to change gears at, speed, conditions ect ?
Cheers
Bucky
AnswerID:
494543
Follow Up By: Member - Bucky - Sunday, Sep 09, 2012 at 08:15
Sunday, Sep 09, 2012 at 08:15
Opps.
forgot to add !
We have clipped gears, occasionally, on heavily corrugated roads, trying to get a little speed up. (say up to 60 km/hr)
Cheers
FollowupID:
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Follow Up By: Member - kwk56pt - Sunday, Sep 09, 2012 at 10:56
Sunday, Sep 09, 2012 at 10:56
Hi Bucky, speed was 35 to 50kph. Tyre pressure 20 front and 22 psi rear. Travalling in 3rd high rarely into fourth so it was mainly the shift from 2nd to third although the problem was still there going to fourth but not as bad, I shift gears between 1500 and 2000rpm. I changed the oil 12000kms ago but I will
check the oil along with the other excellent suggestions. Ive not had problerms before on corrugations.
FollowupID:
770197
Reply By: Bob Y. - Qld - Sunday, Sep 09, 2012 at 09:35
Sunday, Sep 09, 2012 at 09:35
Peter,
With a problem like that, I'd be checking all the engine/gearbox rubber mounts, and also the mounting hardware, like tightness of bolts, or whether any brackets are loose/broken.
Any excess movement in these might let the gear lever hit against the floor, which could make for bad changes.
What about your rear shockies? If they're on way out, the uncontolled movement of rear axle would transmit up the tailshaft, and put a lot of external movement into the engine/gearbox assembly.
Bob.
AnswerID:
494546
Follow Up By: Member - kwk56pt - Sunday, Sep 09, 2012 at 10:59
Sunday, Sep 09, 2012 at 10:59
Thanks Bob, thats a great suggestion to
check mountings and hardware as it makes sense given the symptons
FollowupID:
770198
Follow Up By: Member - Bucky - Sunday, Sep 09, 2012 at 15:35
Sunday, Sep 09, 2012 at 15:35
Bob
That too is a great idea.
Am wondering if there may be a problem with selectors, and or the geartsick coupling.
Cheers
FollowupID:
770222
Follow Up By: Bob Y. - Qld - Monday, Sep 10, 2012 at 12:56
Monday, Sep 10, 2012 at 12:56
Could be, Bucky.
If the vehicle has plenty of K's on it, that poly/nylon bush thingy, where the gear lever pivots might be worn. That your thinking?
Accelerating on corro's is likely to introduce all sorts of problems with the drivetrain, until the road smooths out again.
I've seen triple road trains, cruising along at about 20 clicks, in the table drain, to get away from the corro's. This was between The
Gregory and
Burketown, about 25 years ago.
Bob.
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