The 4-speed Elans have used three different gearbox ratio sets. The very early Elan+0 used (17/32, 22/28, 28/21) 17/32 gears for 3.54, 2.39, 1.41, and 1.00 ratios. Very few Elans have this box.
The next ratio set was used from the Cortina rally program and used (17/32, 22/27, 26/24) 21/28 gears for 2.51, 1.64, 1.23, and 1.0 ratios together with a 3.9 differential. This has been described as "close ratio" or "ultra close ratio".
With the SE came the last ratio set using (17/32, 22/28, 26/23) 19/30 gears for 2.97, 2.01, 1.39, and 1.0 ratios with a 3.55 differential. This has been described as "semi-close ratio" or "mid-close ratio".
Later Elan +0 used a 3.77 differential with this ratio set, as did +2. The 3.55 and 3.9 differentials and 2.51 transmission ostensibly were available to special order.
Over the years, it is hard to tell what transmission and ratio set may have been retrofitted. There is a 3.65, 1.97, 1.37, 1.00 ratio set that was in some of the sedan boxes.
You can get a rough estimate of your actual ratios by running the car up to the same RPM in each gear and noting the speed. Then compute the ratios. See which one is closest to a published set.
On the standard 2.97 box, 1st to 2nd will feel relatively close, 2nd to 3rd will feel a wider, and 3rd to 4th will feel wider still.
http://www.lotuselan.net/forums/viewtopic.php?t=15049 has a downloadable spreadsheet that you can use.
And if you are really curious, email me and I can send you another spreadsheet (much too large to post) that might answer questions you never thought to ask about gear ratio design. Not for the faint hearted.
David
1968 36/7988