NEED HELP!! 7 Bolt Vs 6 Bolt block with automatic tranny

NVmar · Post by **NVmar** » Tue Apr 06, 2010 11:27 pm

I really need your expert advice badly.

I have a stock 1994 4G64 7 Bolt Block (knocking loud) with the stock Automatic transmission.

I went to salvage yard and pulled out a block. It was a 6 Bolt 4G64 1994 block. I pulled it out because everything on the engine looked the same, except this mitsu truck had a Manual Transmission.

However, It wasn't until I tried to bolt the original flywheel onto the salvage block that I realized my mistake! The stock block has 7 bolts, while the salvage block has 6 bolts.

I need this truck running for work.

What flywheel will let me use the 7 Bolt 4G64 with my stock Mitsu transmission?

I have a 1994 Mitsubishi Mighty Max Pickup, 2.4L.
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4g63opelgt · Post by **4g63opelgt** » Sat Apr 17, 2010 1:59 pm

I am no expert, but this may help you. I am not 100% sure I understand your problem, but I think you had a 7 bolt motor in an automatic Truck that was knocking. You got another motor but it turned out it is a six bolt. You want to know what you have to do to get the six bolt crank to bolt up to the 7 bolt flexplate. All this assumes the Truck auto and the 1G and 2G cars share the same flexplate torque & converter, which I am not sure of. If they do, here is one solution, but it's pricey:

http://www.kigglyracing.com/parts/flexplate.htm

The other thing that people do is get a six bolt flex plate (fp), then take your 7 bolt flexplate and lay it over the six bolt fp. You will note where the holes on the ears are close but don't quite line up. Some people just egg the holes of the six bolt to match the seven bolt. There is info available online on this. Again, this assumes the torque converter and flexplate used in the cars are the same as the ones used in the trucks. This will get you the auto trans torque converter bolt pattern on a six bolt flexplate.

If it's not a high performance app, (no turbo) it will probably be okay, but if you are worried about it, give Kevin a call and get the flex plate he sells.

Also, you may encounter another problem when putting the six bolt into a 7 bolt auto. The guys that swap 1G motors into 2G autos have this additional problem. You have to space the motor away from the trans about 1/4". You can either make a plate or Kevin sells them too. You also would need a crank spacer bushing. Kevin has a complete kit for this, but if you want to save some cash, it's not too hard to make yourself.

What is the model number of your tranny? That would help in finding out if the procedure is going to be the same or differ. Hope this helped.

NVmar · Post by **NVmar** » Sat Apr 17, 2010 6:33 pm

Hi, thank you for the suggestion. I really do appreciate your response. However, I'm going to attempt doing what I've done before on a similar situation: I'm going to simply swap a good crank out of another block, and put it inside the block I got the from the yard (not going to use anything out of the knocking block!)....all blocks are out of 4g64s so have the same bore and strock....in other words, wish me luck.

I'm not sure I want to spend more on another block...
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kurb_appeal · Post by **kurb_appeal** » Sun Apr 18, 2010 8:34 pm

The seven bolt crank will not fit in the six bolt block. They will not work together. Go down to the parts store and find a flexplate for a pre 94 mighty max that has the same engine. Before 94 they were 6 bolt iirc. This should solve all your issues with no fab or custom parts then bolt it all together and enjoy

NVmar · Post by **NVmar** » Wed Apr 21, 2010 1:20 am

A more elegant solution to my problem!

thank you

hmh....Why can't I find this flexplate? I called all the auto parts store and searched for it online and still no luck, online is not helping at all either.

Does any one know where I can get it?
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StellarDOHC · Post by **StellarDOHC** » Wed Apr 21, 2010 6:31 am

What does this flexplate look like? I have a 6bolt flexplate from a '95 sonata that had the 4g63, the flexplate on this did not have the ring gear on the the flexplate rather is was on the torque converter and the flexplate attached to the converter with 3 bolts. If this sounds similar i can send u a picture of it to compare. If it looks like what u need u can have it for free since i have no use for it. Im in Canada so shipping might be costly but im just throwing it out there, anything to help a fellow 4G63 swapper.

NVmar · Post by **NVmar** » Wed Apr 21, 2010 10:28 am

a flex plate looks just like a fly wheel, except that on an automatic transmission, the fly wheel is called a flex plate. On some types of flex plates, it has a ring gear for the starter motor to bind. The flex plate on your hyundai is very different since the ring gear is actually on the torque converter.
The flex plate on my mighty max is attached to the ring gear. Here's a picture identical to the flex plate I need (6 Holes and a ring gear):
flex plate

As you can see by the link, it's called a "flywheel." However, on my automatic truck, this "flywheel" is technically called a "flex plate".
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4g63opelgt · Post by **4g63opelgt** » Wed Apr 21, 2010 6:15 pm

Well, I learned something. Too bad the cars and trucks have different torque converter/flexplate arrangements. Sorry, it didn't help you out...Make sure and let us know when you get it back on the road!

NVmar · Post by **NVmar** » Thu Apr 22, 2010 11:08 am

On the contrary, thank you for trying to help out. I have been really preoccupied with other issues at this time, so i have not been able to work on my truck. It's really strange not being able to find something as a flywheel for a vehicle, but my guess is that automatic trucks are not that very common. I will update my post with the solution as soon as have it up and running.
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NVmar · Post by **NVmar** » Sat May 08, 2010 9:39 am

I just want to update this thread to confirm that the cranks ARE NOT interchangeable. How is it that mitsubishi named both these engines 4g64, when they're clearly very different is beyond me. They should have at least tried to differentiate them by appending an additional letter.
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JDOliver · Post by **JDOliver** » Wed May 12, 2010 4:39 pm

Have you checked over the Mistsubishi engine list on the entry page ?? It indicates that the 6bolts were in 92 and earlier trucks. That also corresponds with 4g63 years and DSMs. Sound like you have an early 92 or 91 engine. Check the numbers on it carefully.

You can find a 4g64 6bolt crank on one of the DSM sites for sale usually and on car-part.com