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Old 28-10-2006, 12:01 AM   #1
LG
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Default Help on Diff?

I'm looking into a rebuild on my differiential soon.

I've been quoted from a few places, the current place has said:
Brand new gears, brand new LSD, brand new bearings + fitting = $1400
or Second hand gears, brand new LSD, brand new bearings + fitting = $1200

3.73s are not offered with second hand gears. I am after 3.73s idealy. Or should I just settle for some second hand 3.45s?

What do you guys reckon? Is $1400 a good price? Diff Technics in NSW, charge about $1300 I believe for a similar setup.

It'll have to wait till after my exams, and after my stereo. But at this stage, hopefully late November

Cheers

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Old 28-10-2006, 12:49 AM   #2
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Just paid the extra $200 & get what you want.
Ring around a few place & get a few more quotes.
But $1400 sounds about right.
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Old 28-10-2006, 10:55 AM   #3
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I am running 3.45's now coming from 3.23 standard and the difference is not really enough. In a lwb car wagon like mine i was concerned that to do it properly i would need a two piece tailshaft with 3.9 gears. in a sedan i would take the punt and go 3.9 gears. it does mean you wouldn't want to do a lot of high speed out back cruising though! at 110km limits no probs
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Old 28-10-2006, 11:06 AM   #4
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Quote:
Originally Posted by LG
I am after 3.73s idealy. Or should I just settle for some second hand 3.45s?
How ya gonna recalibrate your speedo? Jaycar?

On a different note, I finally got those skirts off you fitted :hihi:
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Old 28-10-2006, 11:20 AM   #5
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LG, you have never made a compromise on your car yet, dont do it now. Get the 3.73's (although I agree with Jonbays, 3.9's for sure) and never have that "maybe I should have..." feeling later on.
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Old 28-10-2006, 11:22 AM   #6
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I looked into this before i got my diff done, and i found that for $1400 you probably wont get ALL brand new equipment, despite what they tell you. I found out what all the individual parts cost, and it cant be done for that cheap. I had mine build from scratch with brand new 3.73 gears, LSD unit and a re-race (brand new bearings) and it cost me just over $2k. But from what i know, that is how much you will need to be loong at to guarantee a completely brand new LSD. Talk to Bill at Northern Diffs in Epping, thats where i got mine done and i am more than happy with it.
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Old 28-10-2006, 02:49 PM   #7
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I need to talk to the famous "Preston Autos and Diffs" and "Race Shift Automatics" again.

From, the going rate, all the parts from Diff Technics, cost around $1100 shipped to my door. LSD + Gears + Bearings... So I'd think that it should cost about $1400 fitted?

One of my best mates, is actually just starting work at a new Performance shop, which deal with diff's I believe. I might hold out, and get it done from him.

Cheers
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Old 28-10-2006, 04:03 PM   #8
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Go the 3.9 ratio .This will be pretty good.
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Old 28-10-2006, 05:52 PM   #9
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With an Auto BTR 4 Speed here is the main powerband 3000-5000rpm speeds you will get in 1-2-3 with the various diff ratio's

Stock 3.23 diff stock 215/65R15 Tyres
1st 45-75Kmh 2nd 75-125kmh 3rd 110-180kmh

XR6 3.45 diff stock 225/50ZR16 Tyres
1st 38-70Kmh 2nd 70-115kmh 3rd 100-165kmh

Mod 3.73 diff stock 225/50ZR16 Tyres
1st 38-63Kmh 2nd 65-105kmh 3rd 90-150kmh

Mod 3.89 diff stock 225/50ZR16 Tyres
1st 36-61Kmh 2nd 60-100kmh 3rd 87-145kmh

Mod 4.11 diff stock 225/50ZR16 Tyres
1st 34-57Kmh 2nd 57-95kmh 3rd 82-137kmh
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