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Old 14-12-2004, 10:03 PM   #1
SehnKhan
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Gearbox Tough to change to 1st & Rev. Oil?

Hi guys

Don't venture into this section very often, probably should. Anyway, my gearbox is playing up. It's very tough to get into reverse, and on some occasions 1st gear. I'm concerned it's a terminal problem, however have been reading about gearbox oils and people having problems with the box being "notchy" as such, could it just be my g/box needs some good oil?

What oils do you recommend for the humble F-Series box?
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Old 14-12-2004, 10:25 PM   #2
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probably is getting a bit low - it doesn't get changed at a service often.

if reverse is a pain, start the car in reverse (if the situation dictates it)


i'm using Castrol Syntrax 75W90 i think it is - about $25 for 1L...and you'll need 3 (well 2.86 to be exact)
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Old 14-12-2004, 10:29 PM   #3
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Thanks, might go down pick some of that up in the new year and have a crack with the oil first.
Reverse is a pain, but I have been finding that if it won't go into reverse, changing into 4th then reverse normally see's it right :shock:
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Old 15-12-2004, 10:04 AM   #4
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Daughters BG was a bitch to get into 1st, 2nd and reverse.

Changed the oil in the box which came out an emulsified green colour and smelt terrible

Replaced with VMX80 and it is now as smooth as

The front change bushes are on the way out and the clutch is wearing but it's all good
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Old 15-12-2004, 10:08 AM   #5
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I'll probably need to do the clutch at a later stage too, but I think if the oil doesn't change it I'll just have someone look at the g/box.
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Old 15-12-2004, 10:21 AM   #6
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how often should the oil be changed anyway? :?
i haven`t done mine in the 4 years i`ve had the car!!!! ops:
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Old 15-12-2004, 11:02 AM   #7
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Depends

Transmission type
Use (and abuse) history


Many say every year or at least every 25,000 km. Also, if shifting gets hard, time to change.
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Old 15-12-2004, 11:28 AM   #8
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I need to change mine too, but double clutching is fun at the moment!!

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Old 15-12-2004, 12:31 PM   #9
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Quote:
Originally Posted by wazza
Replaced with VMX80 and it is now as smooth as
Thats the **** you wanna use. No way was I going to be paying $90 for gearbox oil. The VMX80 is about $40 for 4L and has been running in my box with no troubles for over 6 months (probably due for a change). The Likes of Zamboni and GTXWGN use it aswel for their boxes.
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Old 15-12-2004, 12:40 PM   #10
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Thansk for your help guys
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Old 18-12-2004, 07:15 AM   #11
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I'm guessing thats whats wrong with mine aswell, dodgy mechanics

1 Gearbox was fine.
2 Goes in for service
3 Gearbox is crap

Getting into reverse can be hard, like i need to put it in neutral release the clutch then put it back in and then it'll go into reverse.

Downshifting,

4th-3rd fine
3rd-2nd fine
2nd-1st friggen hard.
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Old 18-12-2004, 08:19 AM   #12
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you should wait till the car is at a complete standstill before changing from second to first.
mine is sometimes a bit reluctant to go into reverse, but it goes in no probs if i try it while letting the clutch up very slowly. :wink:

who makes the VMX80 oil then guys?
any other recommendations?
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Old 18-12-2004, 08:54 AM   #13
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Castrol - it's cheap but good for older boxes.
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Old 18-12-2004, 09:28 AM   #14
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Few gearboxes have syncro into first or reverse, Mazda did put syncro reverse into some vans in an effort to reduce courier based warantee claims.
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Old 18-12-2004, 05:28 PM   #15
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i still don't know where to find the damn fill hole....

but i need to change mine out...

i have polyurethane shift bushings, gearbox is very prescise, but with age is becoming a bit too stiff now - i neeed oil... hold on i'm not doing anything, i'm going down to Kmart now
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Old 18-12-2004, 05:47 PM   #16
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Quote:
Originally Posted by ahb11m
i still don't know where to find the damn fill hole....
sure its not the same hole the speedo uses???
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Old 18-12-2004, 05:54 PM   #17
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Quote:
Originally Posted by Cosmo Dude
Few gearboxes have syncro into first or reverse, Mazda did put syncro reverse into some vans in an effort to reduce courier based warantee claims.
WTF??? :roll:

Um... synchro's have nothing to do with how a gear engages at standstill... NO gearbox should be having synchro's on reverse because that would mean its designed to engage reverse while the car's still moving foward...

synchro's spool up the input shaft to output shaft speed to that in a helical cut gearbox the gears will engage...

the reason reverese is hard to engage in ANY car (especially late model subaru's), is because even in a helical cut gearbox (what EVERY car comes with)... reverse gear is still a straight cut (as in a dog box style gear)... that's why both reverese gear and cars with a dog box make that whining noise... because its a striaght cut it means the gears must line up near to exact for it to be able to engage.. and the law of random doesn't always permit this to happen first time....

personally my recommendation for problem gearboxes is a product called Roil... but we wont go there... :wink:
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Old 18-12-2004, 06:26 PM   #18
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Quote:
Originally Posted by Bourne Boy
NO gearbox should be having synchro's on reverse because that would mean its designed to engage reverse while the car's still moving foward...
If enough ham fisted ****tards (couriers in general) are breaking gearboxes because they are trying to engage reverse too quickly then you either syncro them or loose the courier buisness.
They won't syncro at speed but have you ever tried to change from 5th to 2nd (it don't work cleanly and they are syncro).

The choice between helical and hypoid cut gears is a compromise between noise and strength and has SFA to do with syncro.
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Old 18-12-2004, 07:02 PM   #19
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Quote:
Originally Posted by Cosmo Dude
If enough ham fisted ****tards (couriers in general) are breaking gearboxes because they are trying to engage reverse too quickly then you either syncro them or loose the courier buisness.
No... because by that theory your saying that you should be able to enage ANY gear 1-5 whilst the car is standing still... and that isn't always the case...

Quote:
They won't syncro at speed but have you ever tried to change from 5th to 2nd (it don't work cleanly and they are syncro).
yes... but that's only cause your tyring to spin the input shaft up from a very low speed to a very high speed.. and that takes time... hold constant pressure against 2nd for a moment... give the synchro's a sec, and yes it will go in cleanly...

Quote:
The choice between helical and hypoid cut gears is a compromise between noise and strength and has SFA to do with syncro.
:roll: yes... a helical cut gear is designed to take force one way only... foward (that's why you shouldn't be using the gearbox for slowing down.. that's what brakes are for), and engage smoothly... whereas a straight cut gear is designed to take force in both directions, and will engage regardless of whether the two gears are spinning at the same speed, just not smoothly... that's why dog boxes (which only run straight cut gears) can always grab a lower gear even without the two speeds matching, and even without using the clutch... you'll never be able to do that in a helical cut box...

by your theory your saying that its just a fluke that every helical cut box comes with synchro... even the ex Mitsubishi Works Galant Rally car i flogged for a day 3 weeks ago had a competition gearbox, but was still running synchro's... y?... cause it was a helical cut gearbox... had it have had a staight cut dogbox (like bryce racing developments WRX rally car i drove 12 months ago)... then it wouldn't have synchro's and i wouldn't have needed the clutch...

every helical cut gearbox has synchros.. and every dogbox doesn't... its got nothing to do with a noise comprimise, its how the gears mesh...
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Old 18-12-2004, 07:06 PM   #20
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Quote:
Originally Posted by Cosmo Dude
The choice between helical and hypoid cut gears is a compromise between noise and strength and has SFA to do with syncro.
the reason why you use a straight cut gear in racing is so that you don't have any synchro's to wait for, and the gear will always engage... there are plently of cheaper helical cut gearboxes which are strong enough to be used in racing, but they aren't.... and its only because synchro's (and helical gears), are slower to engage....

maybe in the newcastle novacatrian street racing seen striaght cut gears are a comprimise between strength and noise.. but certainly not in the real world...
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