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Old 01-20-2013, 09:07 PM   #1 (permalink)
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Mitsubishi AWD Transmission- Rebuild or replace?

Took my car down for a new clutch.

Tired of 2nd gear grind @ high rev from first.
So we took apart the transmission, hours and hours of 'fun'.
Several broken tools, and trips for more tools later, it's in too many parts.
On first glance all seemed well.
The large gears and bearings looked in great shape.

After full dis-assembly and cleaning both intermediate bearings need replaced.
Not too bad, around $100 for the bearings, the rest look great.
Also, 2nd gear is chewed up, missing many teeth. $375, ouch!
2nd friction ring/syncro need replaced, approx. $275.
Transmission could also use a new 1st gear $445.
Also it seems the VCU is bad? $795

Not sure exactly how to inspect/test the VCU, read up on it and watched videos best I could and still pretty confused.
Is it supposed to spin by hand? We had vise grips on the shaft and little movement at all side to side, no spin at all.
I'm really hoping that the VCU is good, it will make or break my transmission.
Will it do harm to the car to drive if the VCU is locked? I read about welding it, but it seemed only for cars that cut out AWD to FWD or RWD?

My rebuild parts quote is over $2000, I found a rebuilt one for $2500.
I really didn't see the transmission getting so expensive.
Transmission is on hold due to lack of proper funding...
I almost regret getting the triple plate clutch, almost.

As for the car rebuild, over budget are the key words:
My initial budget was $3,000. Carbonetic triple plate clutch was $2,500.
1,2 syncro friction rings, stage 2 MP TC brace, and TC seal kit, $500.
Budget was topped out at this point, doing things right is expensive.
After inspecting the transmission it seems beyond a cheap repair...

Still hoping to do the engine rebuild, making high payments on repair debt.
I have 3mm lifters, and new valve stem seals about to go into the heads.
Should be able to bore & hone the engine and rebuild new 50 over.
It still ran very well, but needed 60k at a minimum.
Boxes and boxes of parts going into it:
I now finally understand how people say these cars break/cost money just sitting in the driveway.

The TC has been rebuilt with new seals and fresh paint.
The front calipers have been cleaned and restored with red caliper paint.
Cross drilled slotted rotors and new pads all around.

REALLY happy bad transmission bearing, bad wheel bearings held 180 test.
These things were really scary after the high speed run inspection.
I plead anyone with these cars, don't top out the speedo, it's EXPENSIVE!!!

We're hoping to be able to make it to the STL meet in July.
If things don't start working with us I don't see how.
Wish us luck, and thanks in advance for any helpful advice and comments!
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Block: .50 over laser cut. Heads: BC valve springs, 3mm lifters, seals, etc. Clutch: Carbonetic Triple Plate. Transfer Case: Seal kit & Stage 2 MP TC brace. Transmission: New 1st syncro friction ring, New 2nd gear, friction ring, syncro kit & bearings. Brakes: 94+ rear calipers, 4 cross drilled & slotted rotors all new pads. Ignition/Air: Pulstar IR plugs, 10MM OML wires, free boost mod, drop in race filter. Exhaust: Gutted pre-cats, 3" pipe/no main cat, factory rear active system.
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Old 01-21-2013, 10:12 AM   #2 (permalink)
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Default Re: AWD Transmission- Rebuild or replace?

Get one of these and get a used 5spd rear end and your set.

-Dan

Mitsubishi 3000GT / Stealth 6 Speed 25 Spline JDM "MR" Transmission - Transmissions - Drivetrain - Turbo - 3000GT / Stealth
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Old 01-25-2013, 02:40 AM   #3 (permalink)
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Mitsubishi Re: AWD Transmission- Rebuild or replace?

Dan,
Thanks for your help, that's the best new price I've seen!
I have a quote from a race transmission shop, $1750.
They said the only thing they keep is the case, bring just that.
Comes with better output shaft, all new improved gears and syncros, bearings, everything.

If I go six speed I can keep my good 5spd rear end, or need 6?
What else needs to be replaced besides the shifter?
Cables, etc?

Motor should be out of the machine shop today!
Ready to build it up. Found out I've had a blown head gasket.
Time to get it running on all 6.
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Old 01-27-2013, 02:43 PM   #4 (permalink)
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Default Re: AWD Transmission- Rebuild or replace?

Im debating the same thing...I just need a reverse gear.
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Old 01-28-2013, 11:51 AM   #5 (permalink)
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Default Re: AWD Transmission- Rebuild or replace?

Why do you need a 5spd rear end with a 6spd trans?
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Old 01-28-2013, 12:50 PM   #6 (permalink)
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Default Re: AWD Transmission- Rebuild or replace?

Quote:
Originally Posted by str8savg View Post
Why do you need a 5spd rear end with a 6spd trans?
the MR 6spd is geared differently.

nvm my first reply, i thought the link was to the thread ips had on 3si.
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Old 01-28-2013, 12:55 PM   #7 (permalink)
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Default Re: AWD Transmission- Rebuild or replace?

Ok so what would happen if i just slap it on with my 6spd rear?
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Old 01-28-2013, 01:13 PM   #8 (permalink)
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Default Re: AWD Transmission- Rebuild or replace?

Quote:
Originally Posted by str8savg View Post
Ok so what would happen if i just slap it on with my 6spd rear?
you'd blow up the vcu and center diff since the front and rear gear rations would be different.
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Old 01-28-2013, 01:14 PM   #9 (permalink)
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Default Re: AWD Transmission- Rebuild or replace?

Quote:
Originally Posted by 93-3000gt-vr4-tfc View Post
Took my car down for a new clutch.

Tired of 2nd gear grind @ high rev from first.
So we took apart the transmission, hours and hours of 'fun'.
Several broken tools, and trips for more tools later, it's in too many parts.
On first glance all seemed well.
The large gears and bearings looked in great shape.

After full dis-assembly and cleaning both intermediate bearings need replaced.
Not too bad, around $100 for the bearings, the rest look great.
Also, 2nd gear is chewed up, missing many teeth. $375, ouch!
2nd friction ring/syncro need replaced, approx. $275.
Transmission could also use a new 1st gear $445.
Also it seems the VCU is bad? $795

Not sure exactly how to inspect/test the VCU, read up on it and watched videos best I could and still pretty confused.
Is it supposed to spin by hand? We had vise grips on the shaft and little movement at all side to side, no spin at all.
I'm really hoping that the VCU is good, it will make or break my transmission.
Will it do harm to the car to drive if the VCU is locked? I read about welding it, but it seemed only for cars that cut out AWD to FWD or RWD?

My rebuild parts quote is over $2000, I found a rebuilt one for $2500.
I really didn't see the transmission getting so expensive.
Transmission is on hold due to lack of proper funding...
I almost regret getting the triple plate clutch, almost.

As for the car rebuild, over budget are the key words:
My initial budget was $3,000. Carbonetic triple plate clutch was $2,500.
1,2 syncro friction rings, stage 2 MP TC brace, and TC seal kit, $500.
Budget was topped out at this point, doing things right is expensive.
After inspecting the transmission it seems beyond a cheap repair...

Still hoping to do the engine rebuild, making high payments on repair debt.
I have 3mm lifters, and new valve stem seals about to go into the heads.
Should be able to bore & hone the engine and rebuild new 50 over.
It still ran very well, but needed 60k at a minimum.
Boxes and boxes of parts going into it:
I now finally understand how people say these cars break/cost money just sitting in the driveway.

The TC has been rebuilt with new seals and fresh paint.
The front calipers have been cleaned and restored with red caliper paint.
Cross drilled slotted rotors and new pads all around.

REALLY happy bad transmission bearing, bad wheel bearings held 180 test.
These things were really scary after the high speed run inspection.
I plead anyone with these cars, don't top out the speedo, it's EXPENSIVE!!!

We're hoping to be able to make it to the STL meet in July.
If things don't start working with us I don't see how.
Wish us luck, and thanks in advance for any helpful advice and comments!
with the damage you have to your unit I'd replace it with a good used one or a new one if your budget allows.
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Old 01-28-2013, 04:56 PM   #10 (permalink)
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Default Re: AWD Transmission- Rebuild or replace?

There is a brand new 25 spline 5 speed tranny listed in the for sale section for $2800 delivered. If you don't buy it, I might. I already bought his transfer case.
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