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3 speed auto to 4 speed auto? 

 

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 Post subject: 3 speed auto to 4 speed auto?
Posted: Fri May 07, 2010 12:07 pm 
Stock as a Rock
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Age: 25

Posts: 111

Joined: 24th Sep 2005

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Ride: NA Fairlane

Location: Melbourne
VIC, Australia

gday all, just wondering if the older xf BW40 can be be put behind a 3.9 in a DA.

and if it can will it just use the BW51 bellhousing and such?

also how difficult is it to modify the rear gearbox mount and what has to be done to the mount to drop in a 4 speed?

kind regards
Rob
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 Post subject: Re: 3 speed auto to 4 speed auto?
Posted: Fri May 07, 2010 11:10 pm 
Getting Side Ways
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Joined: 18th Dec 2008

Ride: BA Futura

Location: Hobart
TAS, Australia

It isn't as plug and play as you might think.

You'll need:

4spd BTR (duh)
Bellhousing to suit
Modify cross member
New drive shaft / have you current one modified to suit
I think the torque converter bolts straight onto your current flywheel

The big problem is the computer to control it, it may be possible to have an ECU flashed to control the gearbox and wire up the required sensors etc or use a TCM.

 

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 Post subject: Re: 3 speed auto to 4 speed auto?
Posted: Sat May 08, 2010 11:40 am 
Tyre Shredder
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Age: 52

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Joined: 7th Jun 2007

Ride: NA Fairlane / FE LTD

Location: bayswater
VIC, Australia

Need to know if the BW40 is a straight swap for the BW51 because we have two of them.
We have two 40's we could use, and everything for a 4 speed conversion except the trans. Also have a C4 and a C something laying around. Which is the most straight forward swap or do I chase up a BW51.

Cheers.
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