PG1 Gear box 5th gear Change question

I plan on having an ultra light flywheel fitted just as I did in my last TF. Last time I also had a MS gear change and clutch arm fitted while it was all out as it seems to makes sense. I already have these sat on my shelf at home, it got me thinking however that while it was all out, how I'd like 5th to be more of a motorway cruising gear.



I know that you can take gears out of other PG1 boxes and swap them, but what I would like to know is will it make a noticeable difference?



On the very useful site that someone posted (mgf.ultimatemg.com) I found the gear ratios sheet:



TF VVC 5th gear ratio 0.765 (34/26)

R25/45 Diesel 5th gear ratio 0.648 (37/24)



Will changing to a Diesels 5th make a noticeable difference?

Has anyone done it?

At the moment from memory my car sits about about 3k doing 70mph~, does anyone know what it would sit at after the change?



If no one knows then I'm tempted to do it as I can't see how it would hurt and then the community would know too!



Thank you

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