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Old 17-09-2019, 20:59   #2
macabethiel
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Join Date: Aug 2008
Location: Derby
Vehicle: Freelander & Jeep GC 3.0
Posts: 4,415
Exclamation 70 mph in top gear?

Is this a new issue? If it is ignore comments below.

As I recall our r3mR was on the cusp of dropping down a gear at around 70 mph so I used the Eco switch to change up earlier - not sure yours has one.

Do you have a switch for Eco/Power if you have that will shift the gear range slightly as can a change of auto trans fluid.

Likewise are you talking laden or unladen as load will again make it go for higher engine rpm at any given road speed.

Lastly any drop off in engine power will also make it drop a gear. From my memory the Nissan Gearbox Brain is a fluid block controlled system with a simple electric kick down switch, there might also be some vacuum linked solenoids - check the fine hoses if yours has such a solenoid.

The later more modern solenoid shifters are controlled electronically with a connection between the engine ECU & the Gearbox ECU some systems are a sort of hybrid as ECU control took over the Gearbox Brain mounted in the gearbox itself where gear change points are governed by fluid pressure / engine load alone.

Last edited by macabethiel; 18-09-2019 at 10:47. Reason: more info
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