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Old 05-31-2003, 05:04   #1 (permalink)
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Help - Next step for my XB GT

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.

Thanks for any help
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Old 05-31-2003, 05:09   #2 (permalink)
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How about a T5? not sure if it fits but might be worth investigating as you will get overdrive 5th for quiter highway crusing.
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Old 05-31-2003, 05:23   #3 (permalink)
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Re: Help - Next step for my XB GT

Quote:
Originally posted by patmore1
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.
A single rail won't be much cheaper than a toploader, as all componants are the same except the actual gearbox.
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Old 05-31-2003, 05:39   #4 (permalink)
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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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Old 05-31-2003, 05:48   #5 (permalink)
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If you hammer the car, your gonna bust a standard C4 too though smciner. Late T5's are handling 430+nm so shouldn't have a problem with a mild 351.
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Old 05-31-2003, 07:14   #6 (permalink)
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Go the toploader with the 3.5's

Check out some other threads where people have changed from an auto to a manual, as they all seem to say the car felt a lot quicker after the conversion.

Besides, the power to weight ratio would improve, as the FMX is a heavy 'box!

Seriously though, I'd do the top loader conversion, then drive it and see what you think. Then consider the diff ratio as a separate upgrade a bit further down the track.
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Old 05-31-2003, 10:26   #7 (permalink)
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mild cleavo's destroy T5's........too much torque........seen it happen before......go the toploader with the 3.5 diff gears....
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Old 05-31-2003, 15:50   #8 (permalink)
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I'd definitely go for a top loader.
Don't bother with a single rail or T5, as they won't cope. Believe me, I've destroyed a few.
I also can't stand slush boxes (autos).

I wouldn't put 3.5 gears in either, as the clevo is too busy at highway speeds. I wouldn't go higher than 3.25, with 3.0 gears being ideal if you're using a wide ratio top loader.

Rick.
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Old 05-31-2003, 19:08   #9 (permalink)
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Quote:
Originally posted by Soxx
I wouldn't go higher than 3.25, with 3.0 gears being ideal if you're using a wide ratio top loader.
You mean lower, right?
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Old 05-31-2003, 21:28   #10 (permalink)
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Thanks heaps for all the replies, now does anybody have a toplader, bellhousing, flywheel, clutch and pedal box so I can get started on the conversion?
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