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drained 6speed tranny with 3/8'' rachet on plug. dang i thought i drained the diff. by mistake. out came what looks like synthetic or conventional motor oil. my frc was raced a lot before i bought it . i have put only about 1,200k on it since i bought it. is this a trick for track racers OR have i been tricked??
drained 6speed tranny with 3/8'' rachet on plug. dang i thought i drained the diff. by mistake. out came what looks like synthetic or conventional motor oil. my frc was raced a lot before i bought it . i have put only about 1,200k on it since i bought it. is this a trick for track racers OR have i been tricked??
I've never heard of putting motor oil in the tranny. Was it really dark, like well used motor oil? Does (did) the car shift fine?
i know, but i never heard anyone on the forum suggest using motor oil in 6 speed for racing!!!!!!!
I have a friend that does SCCA races, and he used a really light weight fluid in his tranny. Less viscous fluids save a LITTLE bit of power since you are not dragging the gears through thick stuff. Problem is his sincros (sp?) were going out after less than 30k miles. So yea it is a trick, but not good for duribility. Hopefully this helps.
Jason
Color may not be the best way to determine what the fluid is. How thick is the fluid? Is it as thick as motor oil? If the tranny was driven hard and long it would have gotten very hot and the fluid may have changed color. That is why road racers use tranny coolers on the 6 speeds.
However, using a heavier oil is a tried and true method of getting a car with gear problems sold off.
Color may not be the best way to determine what the fluid is. How thick is the fluid? Is it as thick as motor oil? If the tranny was driven hard and long it would have gotten very hot and the fluid may have changed color. That is why road racers use tranny coolers on the 6 speeds.
However, using a heavier oil is a tried and true method of getting a car with gear problems sold off.
Bill
actually it does smell like atf but it is dark in color, no red at all !
Color may not be the best way to determine what the fluid is. How thick is the fluid? Is it as thick as motor oil? If the tranny was driven hard and long it would have gotten very hot and the fluid may have changed color. That is why road racers use tranny coolers on the 6 speeds.
However, using a heavier oil is a tried and true method of getting a car with gear problems sold off.
Bill
thanks Bill, I think thats what it is. it's darker,and disclored since the previous owner raced it a lot. changing it today,but i don't think i,m going to be able to shift into 5th. again thanks
I have a friend that does SCCA races, and he used a really light weight fluid in his tranny. Less viscous fluids save a LITTLE bit of power since you are not dragging the gears through thick stuff. Problem is his sincros (sp?) were going out after less than 30k miles. So yea it is a trick, but not good for duribility. Hopefully this helps.
Jason
Many guys with the C4 use a motor oil in their trannies. But actually, the Dexron III required for our C5s has a lower viscosity than a 5w30 oil does and the newer Dexron VI tranny spec lowers it even farther. The current blend of AMSOIL ATF which AMSOIL recommends for both Dexron III and VI applications has a viscosity of 6.8 cSt at 100C (212F) whereas a typical 30 weight motor oil has a viscosity of about 10-11 cSt at the same temp. I'd suggest sticking with an ATF as GM recommends. I've been using AMSOIL ATF in my tranny for years on the track without any failures.