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3000gt rear diff conversion


ryno529
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Galant VR-4 org Post #: 827392 posted 09/07/09 05:38 PM     Remind Me!  Send Private Message   Edit Post      
Any one else put a 3000 gt rear end into their Galant? The 91-93 3000gt has the same gear ratio as the GVR4. I know i will need custom axles and make some mounts for the bigger rear end. Just wondering if anyone has any pics or advice if they have done this conversion before . Thanks!

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misterfixit
Victory Runner


Galant VR-4 org Post #: 827396 posted 09/07/09 05:45 PM     Remind Me!  Send Private Message   Edit Post      
the pumpkin case is different.. the diff inside it is the same p/n. use it as a donor to rebuild the vr4 pumpkin. the inner joints are the same as the 4 bolt vr4. then all you need is the 4 bolt halfshafts.

the pumpkin mountings are somewhat different on the 3kgt. and the subframe geometry is slightly wider. I think mromik did a conversion using 3kgt arms and such to widen the track . but that was a long time ago.. i'm hoping someone will jump in here and help my memory out.

Rich



92 UK 1800 GALANT DD
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Stuff Index

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ryno529
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Galant VR-4 org Post #: 827409 posted 09/07/09 06:40 PM     Remind Me!  Send Private Message   Edit Post      
We have broken a few 4 bolt rears and evo rears. I know AMS uses the 3000gt rear in their drag car..They sell a $3000 kit to do it. I figured the 3000 gt rear must be better so i am planning on replacing the whole thing. I am going to try and get this thing in the low low 9's

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ryno529
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Galant VR-4 org Post #: 827729 posted 09/08/09 08:42 PM     Remind Me!  Send Private Message   Edit Post      
nobody else??? oh well . The diff will be here in a few days. Once i get it in and get all the mounts figured out i will post pics. I talked to the driveshaft shop and they said they can custom make me a set of level 5.

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gixxer
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Galant VR-4 org Post #: 827746 posted 09/08/09 09:22 PM     Remind Me!  Send Private Message   Edit Post      
Very interesting. Pictures would be nice.

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donniekak
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Galant VR-4 org Post #: 827798 posted 09/08/09 10:41 PM     Remind Me!  Send Private Message   Edit Post      
What would really solve some more pressing issues would be getting the 3000gt getrag trans into a gvr4/dsm. I'm really thinking about having a bellhousing fabbed to bolt the w5mg1 to a 4g63. Here is a comparison of a 3000gt 3rd gear to a gvr4/dsm 3rd.

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onesickcrx
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Galant VR-4 org Post #: 827806 posted 09/08/09 10:49 PM     Remind Me!  Send Private Message   Edit Post      
^ I want that 3rd gear



Lack of boost

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donniekak
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Galant VR-4 org Post #: 827809 posted 09/08/09 10:55 PM     Remind Me!  Send Private Message   Edit Post      
2 good things about that 3rd gear. 1, i have never seen one break, even with 1,300 wtq. 2, the ratio of it allows 120+ mph. My stealth tt ran 45 in first, 80 in second, 125 in third, 165 in fourth, and buried a 180 mph speedo way before redline in fifth. With a 7300 rpm limiter.

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Galant VR-4 org Post #: 827829 posted 09/09/09 12:48 AM     Remind Me!  Send Private Message   Edit Post      
If you could have a bellhousing cast for a 4g63 block and a 6 speed gear box from a 3000 you'll be rich. They can take 6 cylinder torque down low and tote around a dump truck of a car daily and never break they'd last forever in a GVR4



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razordsm
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Galant VR-4 org Post #: 827842 posted 09/09/09 02:46 AM     Remind Me!  Send Private Message   Edit Post      
^^^^ mmmmm six speed 4g63

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bazeng
work in progress


Galant VR-4 org Post #: 827850 posted 09/09/09 06:09 AM     Remind Me!  Send Private Message   Edit Post      
I always thought that the 3000GT aka GTO gearboxes were weak?

They always seem to be breaking here in AUS



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Galant VR-4 org Post #: 827873 posted 09/09/09 08:47 AM     Remind Me!  Send Private Message   Edit Post      
Those cars are also 3800lbs. Put it in a lighter galant or dsm... it'll last longer.



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gixxer
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Galant VR-4 org Post #: 827875 posted 09/09/09 08:55 AM     Remind Me!  Send Private Message   Edit Post      
really long gears are no fun. i like short, aggressive ratios.

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keydiver
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Galant VR-4 org Post #: 827900 posted 09/09/09 10:37 AM     Remind Me!  Send Private Message   Edit Post      
Quoting bazeng:

I always thought that the 3000GT aka GTO gearboxes were weak?

They always seem to be breaking here in AUS




The biggest issue has always been getting the parts. For many years here in the US Getrag's contract with Mitsubishi was ONLY for complete transmissions, at ~$4k each if I recall, and NO PARTS. The guy I bought my TT from already had the 2nd gear synchros shot with only 1,500 miles on a new transmission!
I think there is finally a 3rd party making some of the parts, as my best friend, who now owns it, bought 2nd and 3rd gear synchros recently and replaced them.

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donniekak
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Galant VR-4 org Post #: 827915 posted 09/09/09 11:40 AM     Remind Me!  Send Private Message   Edit Post      
The 5-speed transmissions never break, the transfer cases and output shafts do. There are fixes for those problems. I rebuild w5mg1 and w6mg1 transmission, parts are expensive, but now available. The only problem with these units is that the big heavy shafts and gears wear the synchronizers quick when shifted at high rpm's.

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Barnes
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Galant VR-4 org Post #: 827928 posted 09/09/09 12:09 PM     Remind Me!  Send Private Message   Edit Post      
Does the 3000GT have a larger diameter clutch than our cars?



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donniekak
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Galant VR-4 org Post #: 827930 posted 09/09/09 12:17 PM     Remind Me!  Send Private Message   Edit Post      
Yes, but i'm sure a custom disk could be used to go on the getrag input shaft. I'm sure there are tons of problems getting a 3000gt transmission to work in a gvr4/dsm. I'm also sure that if done would eliminate all gear shearing innsues in the dsm/gvr4. I'm looking for a w5mg1 locally so i can measure and see how much getting a bellhousing made will cost.


Edited by donniekak (09/09/09 12:20 PM)

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Barnes
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Galant VR-4 org Post #: 827932 posted 09/09/09 12:24 PM     Remind Me!  Send Private Message   Edit Post      
Well. The reason I ask is that the getrag would not have to deal with as much weight if you used a standard DSM/GVR-4 clutch/flywheel. Well, dimensionally they would probably be the same, but I'm guessing a custom clutch hub would be required. Point is, perhaps high RPM shifts would be easier.



-Jon Barnes
#580/2000 (Long Gone)
#908/1000 Black (Sold)
#237/2000 White

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ryno529
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Galant VR-4 org Post #: 828113 posted 09/09/09 09:30 PM     Remind Me!  Send Private Message   Edit Post      
By the time you bought the trans had it built and custom fabbed up all the parts to fit it in, you could buy a dog box. good idea though. The only gear we ever really have had troubles with is 4th

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donniekak
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Galant VR-4 org Post #: 828116 posted 09/09/09 09:40 PM     Remind Me!  Send Private Message   Edit Post      
First off. Have you ever driven a car with a Dog engagement transmission? Good for a race car, but not for the street. They also need rebuilt frequently because the dog teeth wear and the trans starts to slip out of gear. Anything is cheaper that constantly rebuilding a dsm trans. And do you not think that whoever does this won't be able to recoup the r&d costs? Come on, a dsm transmission that will not break, no matter what power you make. How much is that worth to people?

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BOOSTIN HARD
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Galant VR-4 org Post #: 828129 posted 09/09/09 10:10 PM     Remind Me!  Send Private Message   Edit Post      
Quoting ryno529:

By the time you bought the trans had it built and custom fabbed up all the parts to fit it in, you could buy a dog box. good idea though. The only gear we ever really have had troubles with is 4th




My input shaft.


My intermediate shaft.



I also pushed my front diff out of the case, and a couple other serious things.

Im making good power but this is a full evo III gear box so it has all of the highest upgraded parts in it already. There are allot more parts than the fouth gear thats the weak point. Its the whole box.

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H05TYL
Hover/Stand/Bend


Galant VR-4 org Post #: 828171 posted 09/09/09 11:35 PM     Remind Me!  Send Private Message   Edit Post      
Quoting gixxer:

really long gears are no fun. i like short, aggressive ratios.




agreed.

also as the bell housing makes up half of the gearbox casing, it's going to cost ALOT to get one cast, and then machined, etc to work.

It'd be cheaper and easier to have an adapter plate made up



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donniekak
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Galant VR-4 org Post #: 828173 posted 09/10/09 12:05 AM     Remind Me!  Send Private Message   Edit Post      
Quoting gixxer:

really long gears are no fun. i like short, aggressive ratios.



Then you have never walked someone 60-120 mph, without shifting. Also anything below a 125mph trap in the quarter is a 2 shift experience. Not the best for road or rally, but the getrag 5-speed owns the quarter.

Posts: 744 | From: surprise az | Member Since: 01/01/09 | IP: (72.201.136.139) | Report this post to a Moderator

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Galant VR-4 org Post #: 828206 posted 09/10/09 08:02 AM     Remind Me!  Send Private Message   Edit Post      
Is the 3000gt rear really needed? Aren't there plenty dsm's running stock 4 bolt rears with upgraded axles? How much power you plan on putting down?



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ryno529
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Galant VR-4 org Post #: 828213 posted 09/10/09 08:20 AM     Remind Me!  Send Private Message   Edit Post   
800 + to the wheels. Yes we all know the dsm trans weak. The 3000gt is a nice thought but not practical just look at the 2 transmissions next to each other. 2 totally different bolt patterns,different slave cylinder location, different linkages, different axles$$$$$ and so on. My car is not really going to be a street car so a dog box is fine for my application and yes i have driven a straight cut gear trans. I would love to find another awd gear box option like all of you but there really isn't another option at this time that would be affordable. The only bullet proof option would be to convert the car to RWD with the kit from Buschur and run an Automatic GM powerglide, th-400 or 4L80e which i considered but where is the fun in that.

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