High output transfer case highway speeds?

[Cutter]

Nah Derek is a straight up guy, I just think he hadn't driven the truck in a while. It started and ran fine sitting in place, at least at 3500'.

I am going over the truck entirely as time permits to familiarize myself with every nut and bolt and because it is so damn fun.

I did the linkage/bellcrank drill a few weekends ago with my friend, we made sure it had the full travel- lengthened the thread about .5"!!

[TeriAnn]

So far no one has bothered to reply to your question so I'll give it a try.

The Ashcroft high range ratio is 0.87:1.

So the overall fourth gear, high range axle ratio with the stock 4.7 R&P is:

1 X 0.87 X 4.7 = 4.089, or 4.1:1

4.1 and the overall diameter of your tyre can be used to calculate engine RPM at different speeds.

For instance, with 32 inch diameter tyres (stock dia for a 109)

65 mph = 2798 RPM

70 mph = 3014 RPM

75 mph = 3229 RPM

Taller tyres will lower the RPM for a given speed.

I have Ashcroft high ratio kit with 33.3 inch dia tyres so at 65 MPH my Land Rover's 5.0L engine is turning 2689 RPM at 65 MPH.

Of course all this assumes your engine can push the taller gears. Hopefully the six can.

[Cutter]

So far no one has bothered to reply to your question so I'll give it a try.

The Ashcroft high range ratio is 0.87:1.

So the overall fourth gear, high range axle ratio with the stock 4.7 R&P is:

1 X 0.87 X 4.7 = 4.089, or 4.1:1

4.1 and the overall diameter of your tyre can be used to calculate engine RPM at different speeds.

For instance, with 32 inch diameter tyres (stock dia for a 109)

65 mph = 2798 RPM

70 mph = 3014 RPM

75 mph = 3229 RPM

Taller tyres will lower the RPM for a given speed.

I have Ashcroft high ratio kit with 33.3 inch dia tyres so at 65 MPH my Land Rover's 5.0L engine is turning 2689 RPM at 65 MPH.

Of course all this assumes your engine can push the taller gears. Hopefully the six can.

Thanks Teri, you are my hero - great site!