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> Gearbox Help, gearbox
smurf 826
Posted: October 29, 2009 07:03 pm
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I have taken the box off and when I wiggle the end of the shaft that locates onto the engine there is a bit of play so I took of the top plate and when I look in I can see what looks like a bearing wacko.gif A: is it a bearing B: is it knackered does this need changing before it brakes the main drive shaft in the box.
When I hold the end in the bellhousing and wiggle it there is play and the end where the prop sits wobbles a bit, so would there be a bit of play like this or should it be all tight and no play ie should just turn smoothly.

Thanks for any help happy.gif Im not one for gear boxes. unsure.gif
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trimal
Posted: October 29, 2009 07:42 pm
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QUOTE (smurf 826 @ October 29, 2009 06:03 pm)
I have taken the box off and when I wiggle the end of the shaft that locates onto the engine there is a bit of play so I took of the top plate and when I look in I can see what looks like a bearing wacko.gif A: is it a bearing B: is it knackered does this need changing before it brakes the main drive shaft in the box.
When I hold the end in the bellhousing and wiggle it there is play and the end where the prop sits wobbles a bit, so would there be a bit of play like this or should it be all tight and no play ie should just turn smoothly.

Thanks for any help happy.gif Im not one for gear boxes. unsure.gif

I'm not one for gearboxes either, but for what it's worth....

The front end is supported by a bearing in the end of the crankshaft when fitted to the engine, so it will wobble a bit at the front end but should not wobble at the point where it leaves the gearbox.

If it is a standard box the tailshaft is quite long so you will get a slight wobble there, but when the prop is in, should be no wobble at all.

If your are not one for gearboxes, leave the top on, and find someone who is biggrin.gif

IMO it's probably OK, don't worry about shafts breaking, worst comes to worst it will stop!
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fester
Posted: October 29, 2009 07:42 pm
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I think you will find that the 'play' is to aid alignment and run true once engaged in the spigot bearing of the engine crankshaft.
Its this spigot bearing you need to make sure is in good working order
The float in the output shaft is also meant to be there i believe. Once the propshaft is engaged in position it helps it run 'true'.

I do stand to be corrected on this but i think i'm right lol

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smurf 826
Posted: October 29, 2009 08:30 pm
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Cool thanks guys, Ive just never had a look at one to be honest when Ive took one out before.I just take it out bung it in the corner do what it is Im doing then pop it back in.
In that case I will clean it up paint it and put it back in.

Another question for your help if you can.....
If I was to buy a tran x or something what diff would I put it welded coz I aint buying a lsd. So then I can leave it in and just use a different gear. I least thats how I think it works is it?????????? wacko.gif

cheers again.
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trimal
Posted: October 29, 2009 08:54 pm
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What diff you need depends on which track you want to race at.

A tran-x box will cost in the region of £500.
If you race at only one track, or tracks with similar length you do not need tran-x.

If you are going to change diff regularly it's worth having.

A tran-x with 3.89 diff will give you 3.89 in 3rd gear and 4.1 in 2nd gear (approx), if I've got it the right way round!

Commonly used diff with the yokos is 3.77. which are very expensive.
But if you had a 3.54 (slightly less expensive, but not much) and tran-x, that would give you 3.54 and 3.77 ish.

Basically you may still need to change the diff with a tran-x, but not as often.
I'm assuming it's an escort axle? Cortina diffs can be cheaper.
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smurf 826
Posted: October 29, 2009 09:36 pm
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Cheers Trim, I always used to change my diffs at different track which I found a pain in the rce, I thought people had tran x to do away with this hassle and just selected a different gear(ratio)
Theres a firm near me that makes tran x in a 4 or 5 speed box they build to your request. so could I not say to them make my box with.......I have a 4.1 diff so can you make 1st blah 2nd blah 3 blah 4 blah 5blah ratio????? thus cut out the need of changing diffs ever if at all.

Like I say I find all this box stuff hard to get my head round, Maybe I should just keep changing my diffs every Saturday lol biggrin.gif

Sorry if Im not coming across very well but I know what I mean rolleyes.gif
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fester
Posted: October 29, 2009 09:44 pm
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With a tran x or similar it depends if you buy a 2 speed or 4 speed box, you can select the ratios per gear.

Personally i would still change diffs per track anyway.

A limited slip diff wont be of any significant difference to a welded diff in relation to ratios, only the way the power is transfered to the track.

the race box whichever you choose will help the power transfer.

go for an lsd instead of gearbox in my opinion if you have a budget

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smurf 826
Posted: October 29, 2009 10:14 pm
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yeah but then I would need loads of lsd's in different ratios wouldnt I and that would cost a fortune.
I always thought one lsd of a certain ratio then pop a gearbox in and change the ratios by using different gears wacko.gif

Thanks for your answers guys Im taking this all onboard.
(then putting it all on the inside lol biggrin.gif )
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fester
Posted: October 29, 2009 10:31 pm
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no you only need 1 lsd. you need to change the crownwheel on the lsd and then put the lsd in the diff housing.

basically keep the pinion gear in the housing of all the diffs and just remove the lsd unit and change the crownwheel and put in the appropiate housing


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smurf 826
Posted: October 29, 2009 10:40 pm
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ohmy.gif Ahhhh! thats how its done well there you go Ive just lernt summit new on my Birthday biggrin.gif

See stuck out here in the sticks on me own (Anglesey) Im not near any f2 drivers to help me so I just plod along. Must say though theres some good guys on here that give me advice and help if I take my car to them.
(Ahem sad.gif I still owe one of them £60 quid I aint forgot, you know who you are mate)

Cheers for the help Dudes.
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smurf 826
Posted: November 01, 2009 11:19 pm
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Would these ratios in a box be any good for F2????????
4 speed....ratio's 2.48 1.69 1.27 1.1

cheers smile.gif
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MTR150
Posted: November 02, 2009 10:22 am
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got thesefrom another thread
1st 2nd 3rd
cortina 3.65 1.96
tran x 3.03 2.07 1.98
quaife 2.29 2.07 1.95

hope it helps wink.gif
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