1969 J-3000 Crawler/Cruiser Build

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Glad the Impaler
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Re: 1969 J-3000 Crawler/Cruiser Build

Post by Glad the Impaler » Wed Oct 13, 2021 7:35 pm

The coil overs arrived Yesterday - plenty big and ready to party!

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14" of travel - As recommended by a few of the guys that I've wheeled with in the past (they all went with 12" and wish they had gone with 14" on the same super duty Dana 60 front with long radius arms).

Today I got to tear into the 1993(ish) NV4500 I'm going to use. It seemed very tight and smooth just from shifting it and spinning the input shaft in all gears but I felt I'd regret not at least popping the lid on it to take a peak inside for any obvious issues. I'm glad I did - I found NO major issues and only one thing that I wanted to fix.

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The reverse shifter fork is exactly as it should be for an early GM NV4500 model - but it is missing the slider pads that sit on it. $8 from TorqueKing4x4 for ease of mind!

The other issue that you'll commonly read about on NV4500s is the loosening of the coupler nut holding 5th gear onto the output shaft. One thing that I learned in researching this further and taking the tail housing off my own NV4500 is that this issue is primarily only found in high HP/Torque applications - namely diesel applications. Another thing is how it happens on the output shaft and the fix for it - It happens because there is just a thin coupling nut holding 5th gear on and nothing behind that nut preventing it to back off, the fix is to either add more threaded grub screws to the coupler nut to lock it in place or place a spacer behind the nut so it essentially has no room to back off.

The early GM NV4500s don't really have this 5th gear issue though - and taking mine apart you see why. The large harmonic balancer (which is in great condition!) is essentially a spacer so 5th gear could never slide off fully. The coupler nut holding 5th gear on mine had 0 play - this could also because it lived behind a relatively modest power engine too!

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I also got an input shaft seal that I will replace for ease of mind and then RTV this thing back up and get it ready for mock up! I'm fearing a custom crossmember may be in order for the NV4500 mount + NP241. This is only because of the experience I had last week fabbing one up for my buddy with the exact same engine/trans/tcase setup - the front output of the clocked NP241 hangs right in the path of his straight cross member but he did not use the factory GM NV4500 rubber mount - so that may buy me enough drop height for clearance. We shall see during the mock up stage!

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Stuka
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Re: 1969 J-3000 Crawler/Cruiser Build

Post by Stuka » Wed Oct 13, 2021 7:56 pm

Ahh, the holy grail of NV4500's. The harmonic balancer is interesting. Does it balancer the whole rotating assembly, or just 5th?
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Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


Topic author
Glad the Impaler
Posts: 13
Joined: Sun Mar 28, 2021 10:37 pm

Re: 1969 J-3000 Crawler/Cruiser Build

Post by Glad the Impaler » Wed Oct 13, 2021 8:36 pm

Stuka wrote:
Wed Oct 13, 2021 7:56 pm
Ahh, the holy grail of NV4500's. The harmonic balancer is interesting. Does it balancer the whole rotating assembly, or just 5th?
It's locked to the output shaft - so I believe it's balancing the whole "in gear" moving mass. 5th gear is the only gear that rotates freely on the input shaft, all others rotate on the output shaft. Pretty interesting being able to play with it as I've never opened up a big transmission like this before.

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tgreese
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Re: 1969 J-3000 Crawler/Cruiser Build

Post by tgreese » Thu Oct 14, 2021 11:18 am

Glad the Impaler wrote:
Tue Oct 12, 2021 9:41 am
... I'm not 100% sure what transmission I have - It doesn't look like a T-18 so I think it's a T-15? The T-Case is a Dana 20 I'm pretty certain. ...
Just regarding the three speeds ... The T-150 is a Ford passenger car transmission built on license by Tremec for Jeep, and never appeared in a FSJ. It was used in '76-79 CJs only. The 258 six got the T-14 through 1975, and the T-15 through 1979. The Buick and AMC V8s got a T-15 through 1979, with a very long input shaft and either a funky long bell (Buick), or a 5" thick adapter (AMCs). From 1980, the 3-speeds were gone.

This is a T-15. It will say T-15 or 13-07 on the side. It should also have a tag under one of the top cover bolts, with "T-15", a Jeep PN and a Borg-Warner number.

An early CJ-5 or CJ-6 owner with the 225 V6 might want the whole setup. It's a bit long for a CJ-5, but the T-15 is strong and it can be made to work. At worst, the T-15 is valuable parts ... as well as FSJs, the V8 CJs 1972-75 and the V8 Commandos got the T-15, and there's no source for gears now, other than another transmission. Somebody will want it.
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Topic author
Glad the Impaler
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Joined: Sun Mar 28, 2021 10:37 pm

Re: 1969 J-3000 Crawler/Cruiser Build

Post by Glad the Impaler » Thu Oct 14, 2021 5:00 pm

tgreese wrote:
Thu Oct 14, 2021 11:18 am
This is a T-15. It will say T-15 or 13-07 on the side. It should also have a tag under one of the top cover bolts, with "T-15", a Jeep PN and a Borg-Warner number.

An early CJ-5 or CJ-6 owner with the 225 V6 might want the whole setup. It's a bit long for a CJ-5, but the T-15 is strong and it can be made to work. At worst, the T-15 is valuable parts ... as well as FSJs, the V8 CJs 1972-75 and the V8 Commandos got the T-15, and there's no source for gears now, other than another transmission. Somebody will want it.
Thanks for the confirmation - I may scrape a few years worth of gunk off to confirm the numbers you gave!

I do have a CJ builder interested in the setup - I'm assuming pulling the bell housing would be worth it before scrapping the block as it sounds unique.

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