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series on bf turbo diff 

 

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 Post subject: series on bf turbo diff
Posted: Tue Oct 06, 2009 6:21 pm 
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just want to know if the std diff on the bf 6t is the 78 series or the 75 series cause id like to change the ratio to 4.11 or 3.91

cheers in advance

 

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 Post subject: Re: series on bf turbo diff
Posted: Tue Oct 06, 2009 8:33 pm 
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BF F6/XR should be 86 series

Quote:
M86 final drive units are fitted with 3.23 or 3.46
8.6" (220mm) diameter gear sets, with or without
LSDs. M86 final drive units are fitted to all sedan
vehicles powered by a V8 or turbo I6 engine.
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 Post subject: Re: series on bf turbo diff
Posted: Tue Oct 06, 2009 8:55 pm 
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thanks for that didnt want to waste money on the wrong part

 

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 Post subject: Re: series on bf turbo diff
Posted: Wed Oct 07, 2009 9:01 am 
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I hope yours is a manual and not an auto.

If its an auto, thats and awfully big f**k jump and would render first and second gear almost useless.

Be a ripper off the line tho if it can get traction.
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 Post subject: Re: series on bf turbo diff
Posted: Sat Oct 10, 2009 5:08 pm 
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it isnt for my car its a mates he has a ba series 1 with a series 2 tranny and a series 2 bf turbo diff with the ratio of 2.73 it picks up like a nugget due to the ratio used to run better with the series 1 diff with 3.45.
he has a spare straight axle diff off a series 2 ute (dunno the ratio) can he take the guts out of it and put it in the guts of the m86 irs just the gearing change or are they a complete different set up

 

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 Post subject: Re: series on bf turbo diff
Posted: Tue Oct 13, 2009 9:24 pm 
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would a 28 spline gear ratio fit into the m86 diff????????
or is it already a 28 spline

 

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 Post subject: Re: series on bf turbo diff
Posted: Mon Oct 19, 2009 5:18 pm 
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arm79 i think you mean "i hope its an auto not a manual", the btr's have real tall 1st the manuals have the shortest 1st, with 4.11 diff gears would be lucky getting 40k's out of 1st in a manual the auto would get at least 65k's out of first
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 Post subject: Re: series on bf turbo diff
Posted: Mon Oct 19, 2009 5:23 pm 
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ELboy wrote:
arm79 i think you mean "i hope its an auto not a manual", the btr's have real tall 1st the manuals have the shortest 1st, with 4.11 diff gears would be lucky getting 40k's out of 1st in a manual the auto would get at least 65k's out of first


Nope, when he asked about a BF Turbo diff, we assumed it was in a BF - 6 speed Auto's have way different gearing, 60k out of 1st gear with a 2.73 final drive. 6 manuals have 3.73 diff gears and get about 60 out of 1st.

 

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 Post subject: Re: series on bf turbo diff
Posted: Mon Oct 19, 2009 10:00 pm 
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67RCE wrote:
ELboy wrote:
arm79 i think you mean "i hope its an auto not a manual", the btr's have real tall 1st the manuals have the shortest 1st, with 4.11 diff gears would be lucky getting 40k's out of 1st in a manual the auto would get at least 65k's out of first


Nope, when he asked about a BF Turbo diff, we assumed it was in a BF - 6 speed Auto's have way different gearing, 60k out of 1st gear with a 2.73 final drive. 6 manuals have 3.73 diff gears and get about 60 out of 1st.


This man knows how it works.

Only 2 boxes available on BF Turbos, and none of them are BTR's.
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 Post subject: Re: series on bf turbo diff
Posted: Tue Oct 20, 2009 12:23 pm 
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yer sorry guys i have a habit of not putting everything down especially if it isnt for my car thereason i asked is cause he has a bf turbo diff in his xr with the 4 speed tranny but the ratio is to big 1st gear he gets 100kmh instead of 75 i think

 

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