MY/Brumby gbox

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TheInterceptor
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MY/Brumby gbox

Post by TheInterceptor » Wed Apr 13, 2011 8:12 am

Hi all,

So id like to confirm that the Brumby gearbox is the same as the MY box (going to go pickup a brumby d/r box if so, to go into an MY s/r)
Yes stupid question but for peice of mind... :)

Also how straightforward is it to do a gbox swap. Is the gbox overly heavy?
Any tips?

Thanks everyone..
83 Touring wagon
92 GL
02 OB

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TOONGA
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Post by TOONGA » Wed Apr 13, 2011 9:31 am

this isn't in any particular order :)

basically the same gearbox configuration you may want to see if the flywheel clutch and pressure plate are available as well as they may be different to yours .

you will need to line up the clutch before it goes back in otherwise you wil be there all day trying to get the box back in.

200 mm 21 spline or 24 spline or 225 mm 21 spline or 24 spline clutches are the most common variety

from memory the plug for the dual range shift will only show on the dash when it is in low range and not in hi range, as this was the case in my wagon when a dual range box was installed. you just have to remember to make sure the lever is the whole way down before you drive on paved roads.

the gearbox can be lifted by one person but is awkward to manoeuvre under the car so it is handy to have a person to help

a jack under the front of the motor can help to place the box in if it is done on the ground

and the tailshaft is the same length

make sure the cv shafts go back onto the gearbox stubs properly if they are out of line when you put the roll pin back in they will get half way in and never come out again

undo the gear linkages it is funny but if you forget then it is way harder to get the box out

thats all I can remember

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steptoe
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Post by steptoe » Wed Apr 13, 2011 10:04 am

"gearbox can be moved by one person" YEAH? How far and how high !!

I do box change with engine out first from a lifting pole above and do gearbox same using block and tackle -saves back, they are about 55 to 60 kgs and awkward

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RSR 555
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Post by RSR 555 » Wed Apr 13, 2011 10:08 am

Yeah.. MY and Brumbys have 3.9 ratio 4 speed gearboxes and can be swapped over without any troubles (same same)

Pretty much a lot easier with a hoist but other than that.. just like Jules (TOONGA) has mentioned. My best friend once made up a plate (with a tie down strap) to fit on his trolley jack that would fit the bottom of the gearbox, so he'd have support while taking it out of the car.

Also make sure you lift the car high enough (and safe) that you'll be able to get the box out and also be comfitable to work under :)
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Cliff R
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Post by Cliff R » Wed Apr 13, 2011 5:19 pm

When I swapped from the auto to the D/R manual in my 82 wagon I ended up with a 3.7 ratio. Which is better 3.7 or 3.9 ratio.

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TOONGA
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Post by TOONGA » Wed Apr 13, 2011 5:54 pm

steptoe wrote:"gearbox can be moved by one person" YEAH? How far and how high !!
Ive picked them up and moved them on my own, (about 5 metres at waist level then rest :) repeat process) but yes if you are putting one into a car thats on a hoist a gearbox jack is a great help.

I did say it helps to have someone to help

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steptoe
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Post by steptoe » Wed Apr 13, 2011 8:02 pm

and 3.7:1 too !
3.7 does less revs at same given speed same gear selected, then the boxes with different ratio for diff may not have same ratios through gears

not think either is better as such maybe small difference may suit individuals for their purpose, guess you would not even notice

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phantomD
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Post by phantomD » Wed Apr 13, 2011 8:03 pm

Cliff R wrote:Which is better 3.7 or 3.9 ratio.
I also wouldn't mind reading a bit of discussion on this topic if anybody would like to put some experience on the table. Thanks. Steptoe are you saying Brumbys had a mix of both ratios?

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TheInterceptor
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Post by TheInterceptor » Wed Apr 13, 2011 8:46 pm

Thanks a buch gents...my problem now is having to spend the extra dosh on the pressure plate clutch and flywheel since im getting the gearbox for $200 from Coffs Harbour! (a nice lil holiday over easter :) )

Oh well...

Its just a matter of getting me the stands and gearbox jack of some sort that fits under, then sussing it out.
If not well theres a case or so for whoever is willing to do it haha..
83 Touring wagon
92 GL
02 OB

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steptoe
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Post by steptoe » Wed Apr 13, 2011 9:51 pm

RSR says so, I've only ever seen 3.7 in MY and Brumby, have seen 3.9 in L series five speeds that can go into MY and Brumby

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Post by TOONGA » Wed Apr 13, 2011 10:23 pm

Ive seen 3.9 in MY wagons at the wreckers here in Bunbury.

I found my wagon was way better in the dirt with 3.9 diffs but had a slightly lower top speed on the bitumen (having said that it did get to that top speed quicker)

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RSR 555
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Post by RSR 555 » Thu Apr 14, 2011 2:21 am

Yeah.. like Jonno said they are available both in the Brumbys but the early EA81s (blue rocker covers) had the 3.9:1 and different gearset ratios. In later models (black rocker covers) they came with 3.7:1 ratio. When they went to the EA82 model it got worse as Australia had different ratios to Japan and there is lots imported boxes around.

As for the time old question as to which is better, it all depends on your setup.. ie.. wheels, tyres, HP output, etc.. but really it's not that much difference and I'd doubt you'd notice it unless you put on larger rims.
You know you are getting old when the candles on your birthday cake start to cost more than the cake itself.

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steptoe
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Post by steptoe » Thu Apr 14, 2011 9:28 am

My blue rocker cover EA81 in 84 Brum has 3.7 and swear my black rocker cover 92 also same. West Coast , East Coast difference?

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Post by TOONGA » Thu Apr 14, 2011 10:03 am

As I understand it, it was an option that was available, as well a JDM option. so imported vehicles and cuts have this option. my engine and gearbox were a rally import (the box was special as well with straight cut gears)

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RSR 555
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Post by RSR 555 » Thu Apr 14, 2011 11:16 am

steptoe wrote:My blue rocker cover EA81 in 84 Brum has 3.7 and swear my black rocker cover 92 also same. West Coast , East Coast difference?
Yep.. we have sunsets over the water :mrgreen:
You know you are getting old when the candles on your birthday cake start to cost more than the cake itself.

RSR Performance
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