5.3 Vortec with ax15/nv3550/nsg370 help! - JeepForum.com
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post #1 of 4 Old 02-03-2013, 02:01 PM Thread Starter
Why J?
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1993 YJ Wrangler 
Join Date: Sep 2004
Location: Knoxville Tn
Posts: 3,452
5.3 Vortec with ax15/nv3550/nsg370 help!

I finished my 5.3 4L60E swap a few months ago and decided that I just don't like having an auto in the Jeep. So I decided to swap in a NV3550.

I bought a new NV3550, external slave cylinder bell housing, All new OEM Jeep throw out bearing, throw out arm (lever), pivot and slave cylinder. I also got a 2004 4.8 Vortec flywheel and OEM replacement LUK clutch set. I purchased Novak's kit part # 375-3 http://www.novak-adapt.com/catalog/a...on/kit_375.htm

Along with their bronze pilot bushing.

Everything went together great. Everything seemed to line up well. After getting the slave bleed and the motor fired up I ran into my first problem. The throw out arm was hitting the pressure plate witht the pedal fully depressed.

Novak advised that I needed their adjustable throw out bearing. After following their instructions I determined that I needed a 2.71" throw bearing. Their bearing only adjust out to 2.30". So I adjusted it to 2.30" and threw it in there.

The results were that the throw out arm no longer hit the pressure plate but now I dont get full clutch dissengagment until the pedal is 2" off of the floor.

I am now at a loss as to what I should do now.

If anyone else that has a AX15/ NV3550 / NSG370 behind their Vortec motor could maybe post up how they did theirs or what part numbers they used?

Do I need the .400" spacer?

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Phase II 5.3L/4L60e then NV3550

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post #2 of 4 Old 02-11-2013, 10:32 PM
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1979 CJ5 
Join Date: Mar 2002
Location: Jackson, MS
Posts: 100
I'll jump in since my LS1 to NV4500 was a bit trial and err... sometimes I thought more error that trial. I completed mine in 2002.
I was having the same problem you are having now. What I did was adjust the pivot point of the throw out arm. I made it longer by about an 1/8 inch. My bell housing came with a screw in pivot point. If I take it apart again I'll adjust it there.

Now the Short method to test if this will help. I picked washer the thickness I needed. Used a Ball Peen hammer on it. To make it match the mushroom shape of the pivot point. Greased it, slipped it in and it's still there. 32k miles and 8 trips out west.

I did safety wire it after the test went well. I also spent some time to make sure the parts matched well.

Hope this helps
Larry M

1979 CJ5 LS1, NV4500
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post #3 of 4 Old 02-12-2013, 12:27 AM
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1997 TJ Wrangler 
Join Date: Jun 2012
Location: Sandy
Posts: 371
I kept my AX15 behind my 5.3. I wasn't really a huge fan of Novak's adapter ring, so I went with their GMAX15 adapter and I run a 4 bolt Chevy bellhousing. I haven't had any problems at all with it. I am running a LUK clutch for a chev truck that has a 10 spline input shaft. I am also running a billet 168T Mcleod flywheel.
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post #4 of 4 Old 02-13-2013, 03:51 PM
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1982 CJ5 
Join Date: Jun 2008
Location: Arlington
Posts: 853
I have a question. I am using a 5.7 TBI with a AX-15. Love the overdrive , just the pedal is VERY hard to depress. and the tranny shifts slow I cant really run thru the gears. any pointers. I used novaks slave on the bellhousng and uts got a small leak even from the get go.

Victory Loves Preparation
1982 CJ-5 350TBI/AX-15
1989 Porsche 928 S4
2003 Honda VTX 1300R
2005 Infiniti G35
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