Quick reply needed about dif/max speed.

[Eternal]

Hi guys! found a smashing deal on ebay for a lsd 7.5inch diff thats local to me. Only problem its a 3.64 rather than a 3.9. The Diff tag reads 91 GG ADA 3.64 its fron a granny cossworth im pretty sure its a lsd and has 100mm flanges.

16's with 55wall, 3.32, 1.9, 1.31, 1.0 and .838. Final drive is 3.64
6400 redline
1st/37.8mph
2nd/66.1,
3rd/95.9,
4th/125.6,
5th/149.9

Would normaly be this in donor car
17's with 55wall, 3.32, 1.9, 1.31, 1.0 and .838. Final drive is 4.1
6400
1st/34.9
2nd/61.0
3rd/88.5
4th/116.0
5th/138.4

I think thats kinda insane as thats pretty fast top end but not good on acceleration? would rather it the other way around really as acceleration does not get you speeding tickets.