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Registered:
December 2002
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Modifying R31 BTR78 Skyline axle to suit TA22
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Mon, 31 March 2003 14:18
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Hi Everybody.
Does anyoen know anything about modifying the BTR78 axle to suit a TA22? I know you need to shorten it etc but what have people paid to do that? Also what other options are there for calipers on these things? the old style ones look dodgey. What is the likely price i could pay for an LSD centre? At the moment it has a 3.89:1 open centre in it. Can anyone tell me a little bit about these diffs.
Thanks
Daniel
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Re: Modifying R31 BTR78 Skyline axle to suit TA22
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Mon, 31 March 2003 20:42
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its a bog warmer diff - same as whats in the VL's onwards - plenty of people have had these shortened ect to fit the celica.
um, if you want an LSD get a silhouette diff - or - a VL turbo diff - complete with 28 splines...but expect to pay good money for em.
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Location:
Rosanna, Melb
Registered:
June 2002
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Re: Modifying R31 BTR78 Skyline axle to suit TA22
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Tue, 01 April 2003 12:40
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There was a really comprehensive thread on this a while back, from memory any Borg Warner LSD centre (from a recent Commodore or Falcon) will fit. A VL turbo or Silhouette centre will probably be rooted by now. Something more recent would be good.
I looked into shortening an R31 diff, but some diff joints told me that you couldn't do it since the axle narrowed after the splines. Ring around a few places and check for yourself though. Also if you want a 4.1 ratio you can apparently use the pinion and crown wheels out of a Pintara no probs.
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Location:
Perth
Registered:
August 2002
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Re: Modifying R31 BTR78 Skyline axle to suit TA22
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Wed, 02 April 2003 03:29
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Henn, all pintara diff are 25 spline while all skyline diffs iares 28 spline (from what i have been told)
the only diff shop who would modify the skyline diff in Perth says that the 28 spline can only be shortened. No use in using pintara diff or any pintara parts into skylne diff centre.
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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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Re: Modifying R31 BTR78 Skyline axle to suit TA22
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Wed, 02 April 2003 13:21
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Dan, you can buy a brand new lsd centre for $500, or I've been quoted $400 ea when buying two or more, from MotiveGear(?). They are a cone style LSD, good while new, but they don't like getting hot, and will throw back to open centre when pushed hard, and as they get older. A better option, although more expensive ($1400) is a torsion LSD. They come with a lifetime warranty and never slip.
Stay with the 28 spline stuff, you can't buy parts new for the older 25 spline stuff anymore. You can shorten the axles, their spline and axle diameter are the same.
These diffs have a 7.5" crownwheels, common to alot of other cars too such as Pintaras, Later model Falcons(earlier models use a different 25 spline 7.75" centre, that is not interchangable) and Commodore(some later model now run a larger new 7.75-8.0" centre), so you can use ratios from them too, or buy new ratios for around $400.
Calliper wise, you can fit anything you want too, so long as you're happy to pay to have it done, or do it yourself(and I know you don't have a workshop so...). These Skyline diffs run an intergral handbrake/rear calliper setup, so you'll need to consider that too when swapping callipers. You could adapt the lazy drum brake handbrake that the Falcons and Commodores use, but thats more to think about and pay for! Personally I'd just rebuild the standard callipers for now, and wait till you find their limit in the type of driving you do.
Cost wise, expect to pay around $700-800 just for the shortening and remounting. On top of that price, you also need to look at replacing seals and bearings, and while the diff is out, replace the bushes in the rear control arms too - it does wonders for feel and handling! You will also need to supply a standard diff for both the mounts and also the dimensions, location, and pinion angle.
Clint!
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