I was after some help in taking the next step with my XB GT. It has a 30' overbore, 750 Holley, mild came and extractors and 2.5 inch twin system.
It currently has a standard FMX and stall converter and 2.75 diff, my question is:
Do I change the diff gears - I have a set of 3.5s, but am worried what it will do to the cruising factor of the car when on the highway, eg what revs will it do at 110kmh. Will it rev to high to take a trip from Canberra to Sydney?
Do I put a higher stally in it – what size?
Do I put a tricked up C4 with a higher stally?
Do I do a top loader conversion, originality doesn’t worry me as I can always put the FMX back.
Do I do a single rail conversion – being cheaper than the top loader.
If you are running that size carburettor and exhaust (even if you weren't) I would loose the 2.75 diff gears.
You will still be able to do long cruises with 3.5:1 gears, just under 3000 rpm @ 100 km/h from memory.
C4 with a stall would be better than a standard FMX.
Toploader. Better again, now you have hit the nail on the head!
Single rail, if you want to give the car a hiding, forget it.
As for a T5, see above.
Hope this helps.
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