markcro Posted June 29, 2015 Share Posted June 29, 2015 I picked up a bottle of STP gearbox oil additive as my gearbox (GT6 Mk.3) could do with all the help that it can get. 😉 Anyway I've just read the details and it says not to use in automatics or limited slip diffs- all fair enough. But also not in overdrives... Bugger! I can understand the autos and LSDs but why not overdrive boxes? Quote Link to comment Share on other sites More sharing options...
Rallyspit Posted June 29, 2015 Share Posted June 29, 2015 Autos, limited slip diffs and overdrives all have clutches - of one sort or another - in them. The STP additive will make your oil too slippery and the clutches won't bite properly! Quote Link to comment Share on other sites More sharing options...
JohnD Posted June 29, 2015 Share Posted June 29, 2015 Quaife say, on their own website, "we recommend that you use whatever your vehicle’s manufacturer recommends." See: http://quaife.co.uk/customer-service/technical-support/That's because a Quaife ATB - "Automatic Torque Biasing" diff has no clutches. Instead it has a clever system of worm and pinion wheels. Also called a "Torsen" diff, nothing to do with a Nordic rally driver, it stands for "TORque SENsing".So I use Hypoid 80/90 gear oil.John Quote Link to comment Share on other sites More sharing options...
bob dunn Posted June 30, 2015 Share Posted June 30, 2015 I used to make these gears at GKN in Witton B,ham. they still look immposssibble. Quote Link to comment Share on other sites More sharing options...
junkuser Posted July 1, 2015 Share Posted July 1, 2015 http://mgaguru.com/mgtech/rearaxle/ra302c.htm Quote Link to comment Share on other sites More sharing options...
JohnD Posted July 1, 2015 Share Posted July 1, 2015 Thank you junkuser for such a lucid explanation of how the Quaife ATB works, and for why it fails when one tyre loses all grip.Just shows you that none of the marvelous technical aids to driving that we have now are helpful in all circumstances.There is an excellent, short video that demonstrates that ABS is useless in snow : https://www.youtube.com/watch?v=xjptycPi9L8Apparently, the wedge of snow that builds up in front of the stalled tyre helps brake the car, when with ABS the tyre just rolls over the wedge.There is no alternative to being a driver, not a passenger behind the steering wheeel.John Quote Link to comment Share on other sites More sharing options...
RedRooster Posted July 1, 2015 Share Posted July 1, 2015 A mate of a mate fitted one to his race midget, think he only did a few corners before he had an off, he put the original diff back in afterwards. Quote Link to comment Share on other sites More sharing options...
JohnD Posted July 1, 2015 Share Posted July 1, 2015 What I said!He hadn't adjusted his technique to the ATB!JOhn Quote Link to comment Share on other sites More sharing options...
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