Rough First And Second Gear Shifts

I recently replaced my manual rs200 6spd gearbox oil myself with repco branded penrite 75w90 manual transmission oil, then after a while, every time i directly shift from first to second it always get a slight grind and i have to put extra effort on the shift, if i do it slowly (2 second long shift) it would be a smooth shift. The same happens when i shift to first from second, although i don't get the grind but sometimes its even harder to shift into. I might have overfilled the gearbox by 200-400ml, would this be the culprit?

thanks in advance

I would say its more your oil... These gearboxes are really sensitive to insufficient lubrication. I would drain and refill with Redline MT90 but most likely the damage has been done.

Haha don't scare him Winnie, Penrite is decent, but switching to MT90 should help.

Overfilling wouldn't be as bad as it would for your engine.

Ive had bad experiences with penrite motor oil lol... More like Pen wrong lol...

Sounds like the syncros are slightly worn from not having adequate lubrication thats all... MT90 should fix it up but if it doesnt then go to ford and ask for this specific trans fluid. XT-M5-QS say you have a 2001 focus and your flushing the trans fluid yourself. This stuff is perfect for worn AISIN syncros...

my heart skipped a beat reading the second post lol

i also noticed the rough shifts actually occurs when im at higher speeds

thanks for the recommendations, I'll go for the mt-90 soon, is BNT their cheapest reseller at $37.64 plus GST per litre?

Yeah I'm having the same problem, notchy first to second shifts.
Was sweet for a while after I had the gearbox oil flushed and replaced with ATM fluid at the time which was only around 10k ago.

Slow shifts are better, no notchyness..
I'm wondering due to the age of the car if something like this would help?
http://z4.invisionfree.com/lexusaltezzaclu...showtopic=10206

Looking for some free interwebs advice

If I flush again and put Redline MT90 in is there a correct mix with the shockproof?
It's the one thing pissing me off with the car, would be nice to sort it out.

Cheers.

I'm gonna change my gearbox oil to mt90 next holidays.. Hopefully that will improve the shift feel. Me and clm877 have purchased said item and will update when it's arrived and installed...

Will be doing mine to after uni, my gear box does not crunch but makes a nice thump noise going from 1st to second, think thats more to do with some sort of bearing/diff.

I have that strange thump also.. Louder "thump" when cold. Gets a little better after it warms up though..

Haven't gotten around to changin my gearbox oil yet. Let me know how it goes

You used ATF in a manual gearbox? Why???? ESP in a J160!!!

Whats the viscosity? ATF is way to thin and has no extreme pressure or anti wear additives.

I would drop your oil and use the MT90 as soon as you can, Hopefully your syncros arent completely stuffed...

I have used MT90 in three J160s now and they run so nicely afterwards but once the damage is done its done...

Stop scare mungering...
There has been 0 damage caused by this in the 10,000k its been in there.
You forget most people never change thier gearbox oil....

Scare mungering??

How is common sense scaremongering??? ATF CAN be used in many manual gearboxes but only at manufactures recommendations. AISIN boxes however require some pretty thick synthetic gear oil such as MT90 or shock proof if you have gone FI.

10,000Kms is extremely fresh for any gearbox oil so why would you notice wear already? If your oil is too thin you will wear your syncros out a hell of alot quicker and this causes your "notchyness" the next stage after this is grinding through the syncros.

Anyone who doesnt change their gearbox oil at regular intervals (mine is 100,000Kms) should be forced to drive a Getz...

I put it too you that you use the correct oil and your troubles will go away.

You dont mix the shockproof with the MT90 either. You use one or the other.

In my case nothing has changed since the flush, it got better but and is still better than before but I'm a perfectionist so it bugs me.

No damage hashappened with it in, I don't drive the car hard enough often enough.
Thanks for clarifying shockproof / redline.

After reading the before mentioned link I was wondering if this may be my issue - worn rubber seal. -See the link to other thread.

But yes correct wieght is best but I knew the oil had not been changed so I just flushed it with what was avalible.

Would you flush your engine with just any oil???

That doesnt change any rubber mount its a plastic retainer that gets worn and you could try changing it but im 80% certain that the oil is your issue..

No damage present now is like dropping a really thin oil in your engine on a hot summers day, and going for a drive 100Kms down the road and determining everything is ok because the engine is still running smooth. Its the long term effects of putting atf in a gearbox that wasnt designed to use such a thin oil that concerns me such as premature wearing of the syncros from using an oil thats too thin.

Plenty of manual gear boxes spec ATF DexIII so I doubt any damage has been done especially over a short period of time. I don't really see any benefit of ATF over MTF though & as you mentioned Winnie they don't have the additive pack an oil like MT-90 has & it's about half as thin.

Put some MT-90 in silverhelix & I think you'll be pleasantly surprised. It's amazing stuff.


*EDIT*
MT-85 might be worth a look as well http://www.ft86club.com/forums/showpost.ph...85&postcount=56

Interesting read on the motorcraft http://www.mazdas247.com/forum/showthread....l=1#post5581498

Plenty do (some infact only use ATF) but Aisin gearboxes dont. Some include Getrag and ford boxes but putting ATF in a J160 is pretty bad as There has been many cases of people putting ATF into their AZ6 series gearbox to their dismay that I know off which is why I reacted so strongly....

Yea short period of heavy shock loading and slap shifting can destroy a inadequately lubricated gearbox in seconds... I doubt you have punished your gearbox though but as soon as a gearbox becomes notchy the damage to the syncros is likely to be done.