2002 KJ transmission upgrade

[alex_isan]

Hi everybody,

My name is Alex. I'm new to this forum. I have 2.5L diesel engine KJ(2002)
I'm thinking of upgrading the 5 speed manual transmission to 6 speed. The reason: to save fuel and better run in highway conditions. The 5 speed gearbox gives me a high rpm when running above 70 mph. Does anyone know if a 6 speed manual transmission would work on the 2002 KJ?

Thank you

 

[4x4kayak2112]

What's your rpms at 70mph?

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[alex_isan]

What's your rpms at 70mph?

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The rpm at 70mph is around 2800.

 

[tjkj2002]

The 6 speed manual found in KJ's has only 1 overdrive ratio so it will be no better then your 5 speed manual you have right now.The NSG370's only OD ratio is 0.84:1 which is actually lower then the 5 speed manuals OD(which is 0.73:1) so you'd actually raise the rpm's just a little at 70mph using the 6 speed over the 5 speed.


Your export 2.5 non-turbo has 4.10 gears in the diff,you can re-gear to 3.73's in the diffs to reduce rpm's at high speeds but will suffer power and mpg's in the city.

 

[alex_isan]

The 6 speed manual found in KJ's has only 1 overdrive ratio so it will be no better then your 5 speed manual you have right now.The NSG370's only OD ratio is 0.84:1 which is actually lower then the 5 speed manuals OD(which is 0.73:1) so you'd actually raise the rpm's just a little at 70mph using the 6 speed over the 5 speed.


Your export 2.5 non-turbo has 4.10 gears in the diff,you can re-gear to 3.73's in the diffs to reduce rpm's at high speeds but will suffer power and mpg's in the city.

I see your point. In this case i will probably leave it as it is. Thank you for the useful info. Best regards.

 

[u2slow]

Axle ratio change would give you what you want.... so would taller tires.