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Old 06-11-2010, 04:43 PM   #1
adrian302
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Default au towing diff gears??

hi,

iv got a au s3 vct xr6 and its got a 2500ton capacity towbar from factory , im getting heaps of lag on take off and cant get it to spin up would it be if it has towing diff ratio??

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Old 06-11-2010, 04:50 PM   #2
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As far as im aware the highest tow load Ford supplied was 2,300kg's being the 'heavy duty tow pack' as they call it. Auto AU's generally are a little slugglish off the line, the best way to give her some more boogy would be to change the diff gears.
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Old 06-11-2010, 05:01 PM   #3
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yea i think it is 2300kg wat diff gears do you reckon ?
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Old 06-11-2010, 05:08 PM   #4
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3.7's or 3.9's maybe, 4.11's are a little too extreme for some unless you're a regular at the drags. It will effect the rpm the car criuses at too
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Old 06-11-2010, 05:21 PM   #5
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ok yea so mite go for a 3.9, do you no where i can buy the centre diff gears? and any idea what diff gears i would have now?
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Old 06-11-2010, 05:27 PM   #6
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would this one be suitable?


http://cgi.ebay.com.au/DIFF-CROWN-WH...item1e5f705513
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Old 07-11-2010, 10:36 AM   #7
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Your standard diff gears would be 3.45. They didnt change the gears if you got a tow pack fitted.
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Old 07-11-2010, 01:53 PM   #8
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Do u recommend anything then for more power on takeoff?
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Old 07-11-2010, 01:58 PM   #9
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Converting to manual would be my pick then start doing mods to make more power.

If you want to keep the auto put shorter diff gears in and go from there. 3.9's would still be ok on the highway and give a bit more punch off the line.
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Old 07-11-2010, 03:33 PM   #10
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sounds like other things are at play rather then diff gears etc.. how's the engine, exhaust etc..? when was the last time the auto was serviced?
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Old 07-11-2010, 04:43 PM   #11
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Quote:
Originally Posted by Barryxr6turbo
Converting to manual would be my pick then start doing mods to make more power.

If you want to keep the auto put shorter diff gears in and go from there. 3.9's would still be ok on the highway and give a bit more punch off the line.
Why would you switch to a manual, they have a max tow rating of 1500kgs. towing with an auto is the only way to go, especially is you have alot of manuvering to do to park or get the boat in and out of the water.

I am surpirsed you are having trouble towing, my EF XR6 was a fantastic tow car and would happily tow my near 2 ton boat up and down mountain passes. I would look at a cam before diff gears, unless you tow all the time and not on the highway.
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Old 07-11-2010, 04:50 PM   #12
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The way I understood his post was that he just assumed he'd have taller diff gears because its got a tow pack, not about a lack of power when towing.

Maybe he can confirm?

If he isnt towing much I'd go manual. If he is then I'd stay auto too. I was always worried about smashing 3rd gear when towing with my 5 speed.

Boost will fix it.
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Old 07-11-2010, 06:20 PM   #13
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Quote:
Originally Posted by Barryxr6turbo
The way I understood his post was that he just assumed he'd have taller diff gears because its got a tow pack, not about a lack of power when towing.

Maybe he can confirm?

If he isnt towing much I'd go manual. If he is then I'd stay auto too. I was always worried about smashing 3rd gear when towing with my 5 speed.

Boost will fix it.
Good point, definately didn't get taller gears. Not sure if the heavy duty tow pack included a trans cooler or not. if not, would be good to do to protect gear box. My Xr8 has the heavy duty big tow bar but no additional cooler.
When i bought my XR8, i told Ford that i towed a boat and they steering me away from the turbos, which i was seriously considering, said they got too hot when towing, hence why i got the xr8
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Old 21-11-2010, 05:07 PM   #14
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Drop the tow ball and drop in a manual
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Old 08-12-2010, 03:46 PM   #15
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i had a manual au3 xr6 ute which was quick as for a 6 N/A, much fun to drive,but load it up with the trailer and a VW beetle would probably beat it, i thought the manual au could only tow 1000kg's, hence the reason i sold it and bought an auto XR8 which i plan to put a locker and 3.9's in, with tranny cooler to.
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