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Old 10-07-2004, 07:34   #1 (permalink)
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Changing The Diff

Hey People I see that it is talked about a lot well now it is time for me to do it i just got a 4.11 pintara diff center and i want to put it into my EL diff ... So is it hard or what do i need to set the backlash? and if so what to ? any help would be great as i have never done diffs before ( only at trade school and that was a long time ago ) i allso got a 3.7 and a 3.9 i got them all realy cheap
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Old 10-07-2004, 09:03   #2 (permalink)
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Re: Changing The Diff

are you willing to offload the 3.9 gears?
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Old 10-07-2004, 16:56   #3 (permalink)
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Re: Changing The Diff

Look I did Automotive enginering at tech in the 70's before I switched to electronics and I do remeber the process of shimming up the crownwhweel and pinion but Its not as easy as you think to get it right. Its one of those skills you need to keep current. You also need a few shims and have to be prepared to take it slowly.

last diff I did myself was in Valiant Pacer and I spent a lot of time on it and in the end it still wasn't evr really right.

I would get it done professionally.
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Old 10-07-2004, 18:07   #4 (permalink)
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Re: Changing The Diff

you need the correct shim thickness or a few shims.
if you get a pro to do it they will have a shitload of shims in all thicknesses.
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Old 10-09-2004, 07:10   #5 (permalink)
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Re: Changing The Diff

Well i might as well send it off that way I wont bugger it

Any one know of a good and cheap place im in
south-west victoria
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Old 10-09-2004, 07:51   #6 (permalink)
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Re: Changing The Diff

Quote:
Originally Posted by trick_xd
Well i might as well send it off that way I wont bugger it

Any one know of a good and cheap place im in
south-west victoria
Hans at pro set diffs in melton did my ratio cahnge last time but it was a few years ago,think he's still there though. sorry i don't have the number handy, i'll be seeing him in the next couple of months to tighten the lsd in my XG ute.
he was cheap, quick and did the job properly, hope he's still as good these days.
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Old 10-09-2004, 19:01   #7 (permalink)
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Re: Changing The Diff

O.K. thanks and if anyone else knows then please let me know
im sick of the comms beating me off the line
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Old 10-09-2004, 19:37   #8 (permalink)
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Re: Changing The Diff

just try the yellow pages.

the job is not that hard if you have done it before and the BTR78 is a very common diff in australia.

the biggest thing stopping you diy at home is the shims. so make sure that where ever you get it done they have a lot of shims in their workshop so they wont comprimise by just getting it done "close enough" without ordering more shims.

in brisbane there are mobile diff guys who will come around to your house and do diff lapping.

where did you get the gear sets from? wreckers?
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Old 10-09-2004, 19:41   #9 (permalink)
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Re: Changing The Diff

Quote:
Originally Posted by Walkinshaw
are you willing to offload the 3.9 gears?
dito on the 3.7's
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Old 10-10-2004, 00:54   #10 (permalink)
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Re: Changing The Diff

yep i got all the sets 3.45 3.7 3.9 4.11 for $300 the lot i had to pull out 2 sets the rest where out waiting

yes I will sell the other sets i just want to know what will be better for my car first
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