What kind of oil does a gearbox take?
For example, most modern gearboxes require a GL-4 oil, and separate differentials (where fitted) require a GL-5 oil. While they take the same form, the viscosity grades for gear oils are on a different scale than the viscosity grades for an engine oil. The viscometrics for gear oils are standardized in SAE J306.
Can you top up gearbox oil?
If the drain plug has a washer, fit a new one. Some gearboxes do not have a drain plug, only a filler-and-level plug for topping up. To replace the oil in this type of gearbox, use a syringe to draw the old oil out, then refill in the normal way.
What is the viscosity of gear oil?
The main thing you’ll notice about gear oil is its viscosity. It’s much thicker than motor oil, with an average motor oil being 5W/30 and the average gear oil being 75/90 (see this article for in depth explanation of oil viscosity index).
Is 80W 90 the same as 10W 40?
The most common mistake is the belief that the viscosity of SAE 80W gear oil is much thicker than the viscosity of SAE 10W-40 motor oil. This is absolutely incorrect!
What kind of oil to use on a Toploader transmission?
After a few laps, drain the transmission and clean the magnetic drain plug, then fill with 2 quarts of high quality GL-4 gear lubricant. Once completed, the transmission should be race ready. We recommend Brad Penn 80W-90 GL-4 gear oil.
What are the gear ratios of A Toploader?
GEAR RATIOS First Gear ratio w/Stock 32 tooth First Gear Second Third Fourth Close Ratio: 2.32 1.69 1.29 1.1 Wide Ratio: 2.78 1.93 1.36 1.1
How often should you change the gear Lube in a Toploader?
We use several new parts in our transmissions and they will seat in with each other during the break in period. It is not uncommon to see very fine metal on the magnetic drain plug when you drain the oil the first time. We recommend changing the gear lube every 20-25,000 miles in normal street driving applications.
How does a 4 speed Toploader transmission work?
The toploader 4-speed transmission is of the fully synchronizer type with all gears except the reverse sliding gear being in constant mesh. All forward-speed changes are accomplished with synchronizer sleeves instead of sliding gears.