cliftyhanger
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| posted on 5/8/10 at 08:11 AM |
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T9 4x4 gearbox.......
Is it possible to use the gearset from a sierra 4x4 box to make a close ratio "normal" sierra box?? Just a thought as I have a spare
sierra T9, and the 4x4 boxes seem to be fairly cheap. Certainly compared to a capri 2.8 box anyway. And I have a handy chappie who loves building
gearboxes and diffs.....
Any thoughts, or is it not a clever idea?
Cheers all!
[Edited on 5/8/10 by cliftyhanger]
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AR-CoolC
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| posted on 5/8/10 at 08:40 AM |
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quote:
And I have a handy chappie who loves building gearboxes and diffs
Give him the parts and see if he can make one Blue Peter style 
Imagine what it would be like if there were no hypothetical situations.
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mookaloid
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| posted on 5/8/10 at 09:08 AM |
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the close ratio bit is the first gear which is a bit taller. This is in the T9's which were fitted to the V6 engines.
I'm not certain that the 4x4's have the same ratios so it pay to check this first. also the input shaft is longer on the close ratio first
gear so if you can do as you suggest then you will also need to fit a spacer between the bell housing and the gearbox to take this into account.
Cheers
Mark
"That thing you're thinking - it wont be that."
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mcerd1
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| posted on 5/8/10 at 09:28 AM |
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probably more money than you want to spend but you could just get a BGH gearset
they do the mix and match / machining to make it work: http://bghgeartech.co.uk/html/gear_kits.html
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Mr G
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| posted on 5/8/10 at 12:56 PM |
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You can take the rear 4x4 section off and replace it with the tail from a normal type 9. You won't have a speedo drive though and you need to
drill the selector rod to take a pin for the spring mechanism.
Add a spacer plate between gearbox and bellhousing and your off....
Normal is getting dressed in clothes that you buy for work and driving through traffic in a
car that you are still paying for - in order to get to the job you need to pay for the clothes
and the car, and the house you leave vacant all day so you can afford to live in it.
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snapper
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| posted on 5/8/10 at 04:47 PM |
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Having fitted the V6 type 9 it's a simple job with the spacer between the box and the bellhousing.
It's not just 1st that's longer so is 2nd & 3rd, second being the gear that let the V6 Sierra hit 60 in.
If I were fitting one (again) I would seriously consider a 2.8 first
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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mcerd1
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| posted on 5/8/10 at 05:02 PM |
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ratios for a 2.8 4x4 are either: (according to haynes)
3.36
1.81
1.26
1.0
0.83
or:
3.65
1.97
1.37
1.0
0.82
(second set are the same as the 2.0 ratios)
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Paul Turner
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| posted on 5/8/10 at 06:08 PM |
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My spare box was built this way using the front from a 4x4 and the tail case from a well used diesel box. A speedo gear was pressed onto the mainshaft
whilst it was in bits thus still have a speedo. Had to change the selector rod as well since the later rod in the diesel box was a different
design.
All the 2.8 V6 (2wd and 4x4) boxes used the first set of ratios listed BUT 2.3 V6's used the second set listed.
Did one a few weeks ago, the 2wd drive doner was an early one and the selector rod did not need changing.
Its a good way to get a box with slightly better ratios since the 4x4 boxes are generally a lot cheaper that the 2wd boxes and if you have a worn out
box to use for the tailcase you are onto a winner.
You will need a space plate between the box and bellhosing since the input shaft is longer, they are available on the internet.
Paul
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cliftyhanger
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| posted on 6/8/10 at 08:38 AM |
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looking good....My "man" will have no problems mixing and matching components, and I may get him to shorten the first motion shaft while
he is at it, something he has done a few times before (he is really old-skool, used to drag race vans with silly engines down Brighton seafront back
in the early 70's)
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