Mild 340 8 3/4 gear and possibly converter question

Best option? Well it really depends on what you plane to do, strictly around town? Some Highway? Lots of Highway/Freeway?

First off I'm a big fan of wide ratio gearsets in the trans, unless the engine is built to make power in a really narrow powerband...


Lots of Highway? Use 3.23's and find a wide ratio gear set for your 904...

With the wide ratio gear set your ratios would be

1st 8.85
2nd 5
3rd 3.23

Overall a good choice if your gonna be putting miles on the car
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With the standard gear set your ratios would be

1st 7.9
2nd 4.7
3rd 3.23

That first gear jump from 7.9 to 8.85 matters a lot....
Most of us have run these ratios & it's okay, trading acceleration for comfort..
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More of an around town hotrod? 3.55 or 3.91's... 340's don't mind spinning 3000 rpm's so 3.91's are a viable option.. These days people are use to their daily drivers that have overdrive so 3000 rpm's freaks people out.... But that's how we rolled back in the 70's & 80's...

3.91 and wide ratio 904 Pretty much a hotrod, lots of tire spinning

1st 12.6
2nd 10.71
3rd 3.91
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3.55 and wide ratio 904 Excellent all around gears
1st 9.72
2nd 5.46
3rd 3.55
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3.91 & std ratio
1st 9.58
2nd 5.67
3rd 3.91
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3.55 & std ratio
1st 8.7
2nd 5.15
3rd 3.55