4.30 or 4.88 re-gear (1 Viewer)
- Thread starter SQRRRL
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Want in on any eastern sierra action. In Ridgecrest. Looking forward to getting the Kamparoo out with the LC200. Have always towed it with my 4Runner since the LC was the wife's DD. It's my DD now.
On the thread subject, my 4Runner is a 4th gen with 35s and 4.88s. It's a lot of gear for that rig with so few tranny gears, but it'll chirp the front tires if you want it to. Drives better than stock, imo.
nor_cal_cyclist
GOLD Star
Yes, mine is a 2019. Got it this week and drives very nice. Plenty of power.
nor_cal_cyclist
GOLD Star
Sounds like you have your solution.
I can check actual numbers this weekend, but everything about our trucks gearing is different - tranny gear ratios and I believe diff's
Not 100% sold on the 4.3's being enough for the 16+ yet, but we'll see.
I can check actual numbers this weekend, but everything about our trucks gearing is different - tranny gear ratios and I believe diff's
Not 100% sold on the 4.3's being enough for the 16+ yet, but we'll see.
Rpm is going to vary with tire size. With 35s and 4.88 it is 1750 at 65mph
Definitive 200-series Gearing Reference
So I had a little time this morning to put together a chart combining transmission gearing of 6-speed vs 8-speed, diff ratios, and tire sizing into an overall gearing reference. Hoping this will be useful for those trying to understand how their changes are going to effect overall gearing of...
forum.ih8mud.com
nor_cal_cyclist
GOLD Star
Not enough driving time yet. REALLY bad final delivery experience that has kinda made it hard to enjoy, and she's been sitting in the garage.
@SQRRRL I got to drive Rob's truck with 4.88s yesterday. Without a doubt and zero hesitation, you want 4.88s if you are spending the money to re-gear. Rob's truck probably weighs about 400 pounds more than my build that sounds similar to yours in terms of weight. I really loved the difference in engine braking in 2nd and 3rd gears going down hills. Also if you are to believe the computer MPG readout, his heavier truck gets slightly better fuel economy than mine, which could potentially be attributed to the gear change and keeping the motor in a more fuel efficient RPM range for a given speed with less down shifting.
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nor_cal_cyclist
GOLD Star
They got the hard part right (gears/lockers) - it's one of the items I could have easily done myself, that they screwed up and left a permanent reminder.
Giving it another day or 2 before deciding if I can live with it or it will be something that drives me nuts every time I get into the truck.
Live and learn...never again.
I know what a sour taste this type of occurrence can leave, been there, hate it for you.
@nor_cal_cyclist, you should read the post on the Pedal Commander PC27 for the LC200 16+
Pedal Commander or other throttle controller thoughts?
One of the very few things that bugs me about the 16+ Land Cruiser is the throttle mapping which I think is far too lazy and slow. I end up getting worse gas mileage than I would with a more aggressive map because I'm into the gas pedal more than I'd prefer. My 08 LX is on the other end of the...
forum.ih8mud.com
I'm looking at a regear as well in my 2013 LX570. I'm running 33" tires on it (no other mods) and there is a very noticeable penalty to acceleration, braking, and mpg. As @CJ3Flyer mentioned, it's most pain in the ass when fully loaded trying to maintain 75+mph, especially with any kind of incline--constant shifting, won't hold cruise control, rarely get out of 5th.
A 4.3 in the 08-15 LC200 restores the shift points to just better than stock. So, looking for arguments as to why go all the way to 4.88? The advantages at low gears--acceleration, crawling, towing, etc--are clear to me. What's not clear is how it will affect high speed/high gear performance. I regularly drive on the freeway in states with an 80 mph speed limit (which of course means I want to go 90
). The (calculated) difference between stock gearing/tires and 4.88 gearing/33" tires at 80mph is 400 rpm (~2000 rpm stock vs ~2400 mod).
Incidentally, I ran the numbers, and a 4.3:1 diff in a 16+ cruiser is equivalent to a 6.2:1 diff in the 6-speed models... Whoa! That's crazy low dude!
A 4.3 in the 08-15 LC200 restores the shift points to just better than stock. So, looking for arguments as to why go all the way to 4.88? The advantages at low gears--acceleration, crawling, towing, etc--are clear to me. What's not clear is how it will affect high speed/high gear performance. I regularly drive on the freeway in states with an 80 mph speed limit (which of course means I want to go 90
). The (calculated) difference between stock gearing/tires and 4.88 gearing/33" tires at 80mph is 400 rpm (~2000 rpm stock vs ~2400 mod).Incidentally, I ran the numbers, and a 4.3:1 diff in a 16+ cruiser is equivalent to a 6.2:1 diff in the 6-speed models... Whoa! That's crazy low dude!
SQRRRL
SILVER Star
- Thread starter
- #39
I'm looking at a regear as well in my 2013 LX570. I'm running 33" tires on it (no other mods) and there is a very noticeable penalty to acceleration, braking, and mpg. As @CJ3Flyer mentioned, it's most pain in the ass when fully loaded trying to maintain 75+mph, especially with any kind of incline--constant shifting, won't hold cruise control, rarely get out of 5th.
A 4.3 in the 08-15 LC200 restores the shift points to just better than stock. So, looking for arguments as to why go all the way to 4.88? The advantages at low gears--acceleration, crawling, towing, etc--are clear to me. What's not clear is how it will affect high speed/high gear performance. I regularly drive on the freeway in states with an 80 mph speed limit (which of course means I want to go 90
Incidentally, I ran the numbers, and a 4.3:1 diff in a 16+ cruiser is equivalent to a 6.2:1 diff in the 6-speed models... Whoa! That's crazy low dude!
another reason for 4.88 over 4.30, I was driving up a 6% grade fully loaded in the rain. The rain nearly stopped me dead in my tracks. Never experienced this kind of physics.
So, looking for arguments as to why go all the way to 4.88? The advantages at low gears--acceleration, crawling, towing, etc--are clear to me. What's not clear is how it will affect high speed/high gear performance. I regularly drive on the freeway in states with an 80 mph speed limit (which of course means I want to go 90
Without getting into a bunch of physics, my experience in re-gearing off-road focused vehicles is you need to go beyond simply correcting for tire size (if we’re talking drag racing there’s a lot more that comes into play: tire diameter, torque converter stall and “tightness”, engine power band, etc). What you’re really correcting for is the additional unsprung mass that comes with upsized tires. And you’re also likely worsening the aerodynamics of the vehicle (through additional vehicle height) and increasing rolling resistance. In short, this is one instance where intentionally overcompensating your modification makes sense. The RPM difference you cite is 1) not a noticeable difference inside the cabin in terms of NVH 2) actually puts the engine closer to peak torque. I’m not aware of any instance on this 200 subforum where anyone has ever felt they over geared their rig. I think even though we say 4.3s is preferred on the 8spd, the folks who have 4.88s with that combo have zero complaints.
