How can i tell what Ration my 2 speed gearbox is?

Post by: **DreamBuilderiHope** » Thu Jul 27, 2023 10:36 am

Hi, HELP!!!!!

Can anyone help me to find out what my 4 speed gearbox ratio is. I do know it came out of a Lotus Elan.

Post by: **jono** » Thu Jul 27, 2023 11:26 am

Mark the input and output shafts and measure the number of turns it takes to make one turn of the output in 1st gear

Post by: **DreamBuilderiHope** » Thu Jul 27, 2023 12:21 pm

Hi,

Thanks, bur i dont have a gear stick so i cant put it into 1st gear?
Dave.

Post by: **SENC** » Thu Jul 27, 2023 12:36 pm

Take the aluminum cover off and count the teeth. I don't have the chart with me, but someone will turn up that does.

Post by: **DreamBuilderiHope** » Thu Jul 27, 2023 1:11 pm

Hi Henry,

Have taken off the top but what teeth there are several from lert to right diff thickness?
Dave.

Post by: **SENC** » Thu Jul 27, 2023 1:20 pm

The smallest gear (in diameter) is the main/4th gear. I just looked at some notes I had online and it looks like the standard ratio has 17 teeth and the close ratio 19 teeth.

Note - 1st gear and reverse gear have the same number of teeth for the various gearboxes.

Post by: **DreamBuilderiHope** » Thu Jul 27, 2023 1:36 pm

Thank you so much Henry!!!!!

Dave.

How can i tell what Ration my 2 speed gearbox is?

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