NV4500 + 12” clutch and pressure plate???

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7900_Blazer

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I just installed my NV4500 and used the AA kit (bell housing + hydraulic slave mounting bracket)

2 questions:

1. I could only get a 12” clutch setup … no 11” was available.. and my stock clutch was also 12”… Everything seems to bolt up… Am I in for a rude awakening when I crank it?

2. Anyone have a pic of their AA slave kit installed?

Thanks for any feedback..
 

SquareRoot

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I got the same setup. My 12 inch bolted up and fit fine in the garage. Once I tried to mate it to the engine.....guess what? Flywheel hit the bottom of the the bell housing. Put a McCloud 11 inch in and it works great. Just my experience but I guess that's why the AA instructions say to use an 11 inch? Me and @Frankenchevy have a thread on here detailing the whole process, slave kit pics included. We both did the conversion at the same time. I'll try to find it and post the link.
 
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SquareRoot

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Found it. Read this thread

 

7900_Blazer

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@SquareRoot thank you, super helpful. Quick question, re-reading your post.. your flywheel hit the bell housing… where mine when on perfectly…. I wonder what the difference is? I purchased a stock 168 tooth flywheel and clutch kit from Oreilly’s…???

On your slave mounting bracket…do your forks release completely off of the throw out bearing?

I mounted mine exactly like yours… but haven’t tighten the slave all the way down onto the AA mounting bracket yet as it felt like it needed more roo any sense..???
 

SquareRoot

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I bought the trans from a guy who wrecked his 93 truck who had just put in a new clutch. So I got everything with it, including a 12" clutch. I think the issue was that even though it bolted to the flywheel, the flywheel offsets we're slightly different between the squarebody engine and the newer 1 piece rear main seal engine in the 93. If yours bolted up ok and it doesn't hit, you should be good.
On the fork question:, both FrankenChevy and I had to shorten the adjustable push rod. The one in the kit is way longer than needed. Notice, I almost had to trim the rubber boot as it was fully compressed. At rest you want the bearing about 1/8th inch from engaging the clutch disk. Without a gap, it will always be engaged and wear the t/o bearing out in no time.
 

pduffyd

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Dont know if this will work with your setup, but I have used the 15530202 Bellhousing off the later SM465 with hydraulic clutch which is for a 12" clutch. I believe it fits the NV4500? looking at the trans mount holes

You must be registered for see images attach


Notice the bigger lower clutch disk area bulge for the 12", its basically the same for the non-hydraulic SM465 bellhousing shown below which is a 6263756, it looks the same without the hydraulic slave mount but I dont think this fits the NV trans, I could be wrong.

You must be registered for see images attach
 

Big Ray

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I've seen folks drill the 4500 face and use a standard chevy bellhousing.
Works fine, last long time...going to do it when I install mine.
 
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SquareRoot

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There are two versions of the 4500. Early and late. The early has a smaller bolt pattern that requires being bolted to the trans from the inside of the bellhousing. It's a PITA but can work. The late version requires modification because it has uses an internal T/O bearing and has no provision for a fork. There's a few ways to skin the cat depending on how much time/money you have. I chose to spend the money on the AA stuff, bolt it together and be done with it. Been working perfect for almost 10K miles.
 

1984dually

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I used the aa housing and 12 in clutch. Fits fine. AA did say that some will fit and some don’t. I used a autozone replacement diaphram clutch. Flywheel is the same as 11in clutch so any application that uses a 11 in clutch will work.
 

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