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Hey there, just reading your post here about gearing. I get easily confused by this stuff, so forgive me if this question is very basic. Do you mean you regeared your TC with the gears which change both the Hi and Lo? There is a simple TC regear for that, and I think OTRAMM has a YouTube video about it. Is that the TC regear you are referring to?You will really be happy with the low range low. Much better control and much more power. I did the high range underdrive instead of axle gearing and really like the improvement
That's a very helpful explanation. Thanks for taking the time to write that up and share your experience.I purchased a 10% underdrive High Range built by Sumitomo Gear Works (who builds the T Cases for the Land Cruiser). The underdrive reduces the output to the driveshafts to create a final drive ratio of 4.56 to 1. The factory final drive ratio (geared at the axles is 4.10 to 1). At the same time I installed the low range gears to replace my stock low range gears. The low range gears are 2.9 to 1. (Stock ratio is about 2.3 to 1) All of the parts were from Cruiser Brothers in Stockton, CA.
Jorg helped me understand what I was getting, and also provided factory sealant for the transfer case.
While the T Case was down, I was amazed to see that with 250K that the bearings and gear surfaces were all in great shape. I went ahead and installed new bearings.
The results: no loss in mileage, more power, much less up and down shifting on. hills, and still able to roll down the highways at 85 mph without over revving my engine. I have been running 315s on my stock gears, and it was not as pleasant as when I was running 265s.
Off road the Low Range ratio gives much more climbing power and much more descent control, less use of the brakes, and better crawling power.
The cost of these two mods was about half the cost of regearing the axles, and has met my needs. I also went to a part time conversion. I used the Marks set with Aisin hubs, from Australia.
The part time conversion did NOT increase my gas mileage or ease my steering, but it did meet the goal I set of extending the life of my Longfield chromemoly axles/birf set, since I drive from the Los Angeles area to Moab and other parts of Utah 2 to 3 times each year. I also consider the locking hubs to be fuses to preventing axle damage. They are not as strong as the drive flanges, and a failure (which hasn't happened to me yet) might preclude a broken birf.
If you have already re-geared to 4.88, the 10% under drive would gear you much lower and unless you are running 39s, or have a full time crawler, would gear you too low in my opinion. The low range would gear you even lower and add more climbing power, more crawling control and more descent power, but would further reduce your top speed in low range. Since I do a lot of crawling, I would still install the low range reduction gears if I was running 4.88s.