CK5
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'89 R3500 Crew Cab 2wd to 4wd conversion & beyond

Started out with 2wd TBI350 with SM465 to current 4wd with 454, 700r4, NP241
I totally forgot to mention, the narrowed front worked great! There were lots of times I would have been digging it into rock walls if it was still full width.

As further follow up on the trip. My biggest fear going in to the trip was that I'd have cooling issues in that 100° heat in the Sand Hollow area. However, there were no issues. The only time the engine or trans topped 200° was running in the sand. I think the highest engine temp I saw was 205°, and the trans might have hit 220° on a long run in the sand. But again we were in air temps at or near 100° most of the time.

The crew cab stinks in the sand, by the way. I probably coulda lowered tire pressure to help, but without beadlocks I didn't want to run lower in the rocks.

Another concern I expressed earlier in the thread was transmission control. The Terminator X doesn't offer the ability to compensate for different transfer case ratios. You can write in a switch to ground that puts the trans in manual mode which I did. This worked great for anytime we had one of the cases in low range. The only time I would have liked having normal automatic shifting was running higher speed in the dunes. Manually running the gears and engaging the torque converter clutch (TCC) by a switch was cumbersome. I can improve that by putting the TCC switch up by my leg instead of on the dash.

The other thing I noticed about the more powerful engine is that running low range with just the NP205 pulled better. With the old engine it felt a little weak. This was nice when we were running the sandy areas between trails.

In general, this engine just pulls better. Definitely a seat of the pants improvement. Even after a week of trail running, I'm still marveling at how much better I like the exhaust tone.

Here's the fix it list I have now:
1) Right valve cover leak.
2) Oil cooler fitting leak at the block.
3) Rear wheel seal. This actually started on the Rubicon but it was minor enough I forgot about it. It's worse now. But I'm pretty sure they are the original 1979 seals.
4) The 2 rear hood pins are bent and I'm sure near breaking. They are aluminum.
5) Put TCC switch on console by my leg.
6) Build new sliders. I bent the driver side slide up into the doors again. They need to be totally remade. I have a design in mind to tie them to the frame.
7) Add rear wheel spacers. I should have made the bed a little narrower so the tires would stick out just a bit. I get into the "fenders" often and having the tires out, even just an inch, would help. Or I start a go-fund-me to get bigger tires...
 
I totally forgot to mention, the narrowed front worked great! There were lots of times I would have been digging it into rock walls if it was still full width.

As further follow up on the trip. My biggest fear going in to the trip was that I'd have cooling issues in that 100° heat in the Sand Hollow area. However, there were no issues. The only time the engine or trans topped 200° was running in the sand. I think the highest engine temp I saw was 205°, and the trans might have hit 220° on a long run in the sand. But again we were in air temps at or near 100° most of the time.

The crew cab stinks in the sand, by the way. I probably coulda lowered tire pressure to help, but without beadlocks I didn't want to run lower in the rocks.
How low were you? I run 10 in the front and 8 in the rear in the sand with no bead locks. I used to do it with 16.5" wheels! I was more careful then about turning. I still try not to make sudden turns with the low pressure, I don't want to roll a bead.

Another concern I expressed earlier in the thread was transmission control. The Terminator X doesn't offer the ability to compensate for different transfer case ratios. You can write in a switch to ground that puts the trans in manual mode which I did. This worked great for anytime we had one of the cases in low range. The only time I would have liked having normal automatic shifting was running higher speed in the dunes. Manually running the gears and engaging the torque converter clutch (TCC) by a switch was cumbersome. I can improve that by putting the TCC switch up by my leg instead of on the dash.
If the time comes someday to rebuild that trans, rebuild a 2WD one with the correct tailshaft for your TCase and that will fix that issue.

The other thing I noticed about the more powerful engine is that running low range with just the NP205 pulled better. With the old engine it felt a little weak. This was nice when we were running the sandy areas between trails.

In general, this engine just pulls better. Definitely a seat of the pants improvement. Even after a week of trail running, I'm still marveling at how much better I like the exhaust tone.
Its amazing how much cylinder pressure can be heard. You have the same cubic inches, but slightly more compression, probably better ignition timing, and a different camshaft. It completely changes the tone. I had some mufflers I really liked with my SBC, then I changed to the 489 BBC and I hated the sound through those mufflers and tailpipes! The big block needed to breath.

Sounds like you are happy with your engine, glad you seem to like the camshaft. If there is anything you don't like let me know, perhaps we can tune it slightly.

7) Add rear wheel spacers. I should have made the bed a little narrower so the tires would stick out just a bit. I get into the "fenders" often and having the tires out, even just an inch, would help. Or I start a go-fund-me to get bigger tires...
:rotfl:
 
How low were you? I run 10 in the front and 8 in the rear in the sand with no bead locks. I used to do it with 16.5" wheels! I was more careful then about turning. I still try not to make sudden turns with the low pressure, I don't want to roll a bead.


If the time comes someday to rebuild that trans, rebuild a 2WD one with the correct tailshaft for your TCase and that will fix that issue.


Its amazing how much cylinder pressure can be heard. You have the same cubic inches, but slightly more compression, probably better ignition timing, and a different camshaft. It completely changes the tone. I had some mufflers I really liked with my SBC, then I changed to the 489 BBC and I hated the sound through those mufflers and tailpipes! The big block needed to breath.

Sounds like you are happy with your engine, glad you seem to like the camshaft. If there is anything you don't like let me know, perhaps we can tune it slightly.


:rotfl:
Thank you for all the engine help! If only people saw all the messages I bombarded you with!
 
I got to add another Old Chevy Truck Badge of Honor sticker, Elephant Hill.

20240911_165640.jpg

Now I just need to run the Hole in the Rock trail in Utah and I'll have all of the Utah badges. I'm also short Black Bear Pass to have all of the Colorado badges.

I'm a "make a list and cross things off" type of guy, so this is something I've enjoyed doing. Plus poking a little fun at the same time.
 
I ran the tires at about 12psi.
With my old tires(36x14/16.5 TSL) there was a huge difference between 12 and 10/8 psi on the sand. They were load range E, and very stiff.

When I got my new 37x12/17 I didn't even try anything but 10/8, but there was a night and day difference in traction, the new tires were amazing traction with much softer sidewalls, more bulge at the same pressure.
 
Do you make those yourself?
Certainly! :D

With my old tires(36x14/16.5 TSL) there was a huge difference between 12 and 10/8 psi on the sand. They were load range E, and very stiff.

When I got my new 37x12/17 I didn't even try anything but 10/8, but there was a night and day difference in traction, the new tires were amazing traction with much softer sidewalls, more bulge at the same pressure.
I thought when were there in Southern Utah they looked pretty bulged out, but now here at home I don't feel they do. I'm wondering how much difference there is due to the temperature making the rubber softer. I stopped letting air out because the sidewall was pooched out so much there.

On the Rubicon I aired down to 10 psi and I had some air getting burped out the sidewalls a couple times when rocks were pushing on the tire. I've been a little reluctant to go that low again.
 
Elephant Hill (30).jpg
I remember that tight spot in elephant hill. How did the truck do here?

David
 
I remember that tight spot in elephant hill. How did the truck do here?

David
It fit alright. I did have to fold the mirror in.

The visitor center said 85" was the limit. I think mine was like 82.5". It of curiosity we measured the gap for ourselves. 92" was the narrowest we found. I kinda figure the park service is going to have some fudge room on their recommendation.
 
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