[Fot] Gear ratio recommendations

[Larry Young]

I tried a bunch of arrangements when I raced my TR3. I agree that you 
want something close to a standard 3.7 final drive. My favorite setup 
was close ratio 4 speed, A-type overdrive and 4.55 rear. The 0.82 
overdrive gives 3.73 in 4th overdrive. Your overdrive ratio is similar. 
- Larry Young

On 3/24/2025 10:49 PM, Dave Riddle via Fot wrote:
>
> While we will be running the Toyota 5 speed in the TR4 at Lime Rock 
> that gear box and engine are slated to go back in the BajaTR3 
> afterwards.  The motor that is being built for the TR4 is being mated 
> to a 4-speed TR4 box that has been order.  Trying to determine what 
> gear ratios to run in it. Will have both a 3.71 and 4.11 final drive 
> and the motor turning over at 6k with about 175 hp at the rear wheels.
>
> Currently the Toyota boxes we have are running…
>
> 1^st 3.950                    3.830
>
> 2^nd 2.140                    2.060
>
> 3^rd 1.38                       1.430
>
> 4^th 1.00                       1.00
>
> 5^th 0.810                    0.840
>
> Anyone care to share the hot setup for a 4-speed TR4 box?
>
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