Change the stock 4.10 gears to 5.38 gears.
What it does:
After changing the tires from 32" to 35" there were some issues
- The first time I drove it I noticed it needed a little more gas to get
going. Over time I noticed that it felt more like the gears had a very
slight binding/I had to drive up a very small hump when starting - no real
binding/bump - just felt that way.
- On very slight hills and in 2WD or 4High in Drive the transmission canít
hold and it rolls back.
- In 2WD or 4High and going 20mph or less thereís almost no difference
between D, 2nd, and 1st (no difference in engine braking, torque).
- On the freeway it kicks out of OD going over simple/small overpasses.
- On the freeway going up a steeper hill it kicks down to 2nd to keep up.
- Going down some steep dirt hills in 4Low had to use brakes.
- Acceleration from stop not great.
- Crawling on rocks in 4Low and 1st not much worse than stock.
- MPG: 32s (14.6K miles): 16.1, 35s (2.2K miles): 15.1
After switching to the Yukon 5.38 gears:
- Starting feels great. No extra gas needed.
- Transmission holds on small hills.
- Thereís noticeable engine braking and torque in 2nd and a lot in 1st.
4High is nicer on the trail with the engine braking.
- Doesn't kick out of OD on simple/small overpasses and small hills.
Doesn't seem to struggle at all on these types of hills.
- On larger hills kicks down to 3rd and holds with no struggling going up
- On the same hills additional braking is not needed. On most hills no
braking is needed at all.
- Acceleration from a stop is great - no issues.
- Crawling on rocks in 4Low and 1st better than stock.
- Breaking in gears (500 miles): 16.8, My normal driving (8.7K miles):
No photos of the Gears and Master Install Kits as
purchased and installed at Absolute Offroad.
I broke in the gears by driving 15 miles then
stopped for 6 or more hours and repeated until I hit 500 miles. I was driving
on straight roads, so at times I kicked it into 4 High to add some heat/stress
to the front gears.
Draining the oil from the rear:
Stuff from the drain plug magnet -
very fine metal and grease:
I dug around in the sludge and
found these two small (metal?) grains - smaller than sand (actually they may
have even been in the rag before I used it :S)
Draining the oil from the front -
a lot clearer as it didn't get nearly as much stress. The drain plug look about
the same as the rear:
Stuff from the front drain plug
magnet - no pieces that I could feel, just some shiny "flakes":
3,000 miles after the oil change
the rear looked pretty clean (the front was even cleaner):
See Riddler Differential Covers for information on
the gear oil quantity and type.
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February 23, 2013 05:14:17 PM