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How to identify high speed rear in TT
Posted: Sun May 24, 2020 2:42 pm
by Alex Dragone
I just acquired a 26 TT truck and it has a ruckstell and Rocky Mountain brakes. I have been told that some of these TTs came with a 5:1 gear ratio rear axle. How can I identify if this truck has it? Do I have to disassemble the rear? The previous owner was said to have driven it at 35 mph or more. Any help would be appreciated. Thanks
Re: How to identify high speed rear in TT
Posted: Sun May 24, 2020 3:10 pm
by Humblej
Jack up one wheel, crank the engine over by hand and count the revolutions of the engine and the wheel.
Re: How to identify high speed rear in TT
Posted: Sun May 24, 2020 3:26 pm
by HPetrino
If memory serves I think if you jack up one wheel, turn the crank and count the engine revolutions it takes for one wheel revolution you need to divide by 2. 5 engine revolutions should get 2 wheel revolutions meaning it has 5:1 gears. If it takes a little over 7 engine revolutions to get 2 wheel revolutions' then it's a low speed set.
At lest that's how I remember it. If I'm wrong, somebody please correct me.