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Engines in the last 20 years (like Atlas engines) use very thin piston rings. Other tolerances are tighter too. Thin rings turns out is better for engine longevity, efficiency and power. So mfgrs have added oil squirters to help lubricate the lower cylinder. And thinner oil is used as a result...

Some guys want a hand-held scanner, some a bluetooth OBD device (bluetooth to phone/tablet). Lot of people on the Ram truck forum I go to a lot like the MX+ OBD scanner. I haven't used one, but I've looked into it (and others) and it seems like an affordable, compact device that is really...

Basically the same atlas engine with an extra cylinder: https://gmtnation.com/forums/threads/4-2-engine-rebuild.16080/

OP - If old posts here, and Colorado Forums engine posts are of any value, thicker oil might be a bad idea. Supposedly the oil squirters at the base of the cylinders are calibrated for the recommended oil viscosity, and don't 'squirt' very well or at all with thicker oil. That's what others have...

BTW, There's also a larger Tank 500, which seems to be very much like the Toyota Prado (international spec edition). Sorry, no pics, but it's on the GWM's website.

I snapped a bunch of pics of some "Tank 300" vehicles ...which is very H3-like. They look neat (not avail in the U.S.). I'd love to take one off road. Probably what the H3 would be like today if GM kept making them. They seem like they have all the right Goods. Here's the write-up...

More pics (daylight shots are from the Black Tank 300 above ...night shots are from a base vehicle):

Ok guys. Just got back from China. Saw many Tank 300 vehicle's (they're new). They immediately caught my eye. Very H3-like! I managed to get some pics (below). They seem to be selling well given how many I saw in the short couple years they've been on sale. Some online posts compare them to a...

I suspect it's possibly a metric thickness.

I'm not sure. I haven't measured my frame thickness. I'll try to get under and measure a spot. The following chart gives some steel thickness recommendations. Are you looking at home center or hardware store steel? Or working with a steel supplier. 1/8" cold-rolled steel should work fine (hot...

Manual transmissions are not that difficult. If he's had it apart 2x ...maybe it IS the pilot bearing/bushing (which isn't inside the transmission). Maybe he's overlooking it (cheap/worn/damaged/wrong size, etc) ...or a clutch component. Hopefully your guy will figure it out. Best of luck.

Sounds intriguing!!

Does the sound increase/decrease if you give it a little speed? Does the noise follow engine speed? (possible throw-out bearing issue??). When the clutch is depressed, the input shaft can wiggle if the pilot bearing is worn/loose. Let the clutch out and the clutch helps 'center' the input shaft...

So ok. I re-read your description. Are you're saying with the clutch depressed (trans in reverse), vehicle not moving, ...that's when you hear the rattling noise? But you don't hear the noise when the clutch is out and driving? If so, that usually points to a failing/worn pilot bearing, or...

Did your mechanic disassemble the transmission? Or just inspect the trans on the hoist? You don't get the same noises when it's not under load, in the air. The only way to know what's going on for sure, is to remove & completely take apart the transmission. Then inspect all the...

How loud is the noise? Reverse often makes noises because the reverse gear is straight-cut. Where the other gears are helical cut (angled) and quieter. Reverse is almost an after-thought. See picture below ...lower rt. I would normally look at the gear teeth and/or the thrust washer on the drive...

So, let me see if I understand you correctly: Your H3 has a 5-spd and you hear a noise (rattle) in reverse under certain conditions?

Did you do it, or are you having a shop (or buddy) do it?

Sorry, I guess I started scanning the later portion of the post (thanks for catching me on that).... thought i read he was 'going' to route the tubes via the kick panels. My bad. Attention issues today. (can't edit post) No, I haven't seen that before, but it's a really good idea. I should do...

Are you absolutely sure? The tubes are way high up there ...where you can hardly reach them ..and hardly see them. More like under the windshield, or very top of the firewall, is a better description. It's easy to not see them. Easy way to know is to go to the hardware store and get 7' of very...