dbtk2 Posted June 23, 2006 Report Posted June 23, 2006 Basically I'm trying to figure out if putting a 4t60e from a 3100 powered car will work okay in an LQ1 car. I know the gear ratio is a little bit taller in the 3100 tranny, but will the chip go crazy because of this or will the car just shift a little sooner than it should? We just need to get the car on the road and driving for a couple months. I know that physically it will bolt up just fine...just wondering about how it will work with different gears. Thanks. Quote
joey b Posted June 23, 2006 Report Posted June 23, 2006 not an expert, but you will probably need a chip or something of the sort to make the speedo correct. Other than that, i don't know why it wouldn't work. Quote
Regal_GS_1989 Posted June 23, 2006 Report Posted June 23, 2006 If the wiring will work, then it should only shift sooner, and the speedometer will read slower than what the car is travelling. I know that if it had a shorter final drive, then it would probably give you a trans component slippage code, but that shouldn't happen if it is a taller final drive. EDit: Wait, Im stupid If you put in a taller final drive it will give you the trans component slippage code because the input speed would be detected as greater than the output speed. Quote
dbtk2 Posted June 23, 2006 Author Report Posted June 23, 2006 If the wiring will work, then it should only shift sooner, and the speedometer will read slower than what the car is travelling. I know that if it had a shorter final drive, then it would probably give you a trans component slippage code, but that shouldn't happen if it is a taller final drive. EDit: Wait, Im stupid If you put in a taller final drive it will give you the trans component slippage code because the input speed would be detected as greater than the output speed. That is what I am hoping. If that is what will happen then thats all I need to know. Thanks! Quote
ToroToro Posted June 23, 2006 Report Posted June 23, 2006 Why would it shift sooner? Doesn't the PCM control the shifts anyway? Punch me if I'm missing something here. Quote
dbtk2 Posted June 23, 2006 Author Report Posted June 23, 2006 Why would it shift sooner? Doesn't the PCM control the shifts anyway? Punch me if I'm missing something here. It would shift at the same speeds that it did before. The RPM's however would be lower due to the gears being longer. The shifts are MPH based not RPM based. Quote
Crazy K Posted June 25, 2006 Report Posted June 25, 2006 WAIT!!! the speedo is based on the final output of the speed sensor which is installed past the point in the driveline where the ratios are changed. It is based on the final speed of the differential carrier, which would be turning at a 1:1 ratio with the wheels... for those who should know, the chain between the gears which transfer force from the torque converter to the main clutches and stuff is the first point where where gearing ratios can be adjusted, and the second is at the sun gears between the output shaft coming from the end of the clutches and stuff, and the differential carrier. (clutches and stuff: one hell of a great technical term!) so your engine would simply be cranking at a lower rpm for speed... which may or may not set off the aforementioned driveline error code.... it depends if the pcm cares. btw, what car is this in? Quote
dbtk2 Posted June 26, 2006 Author Report Posted June 26, 2006 It doesn't really matter anymore ended up being able to save the tranny that was in the car. Good info to have in the future though. The car is not mine, I was helping a friend. Quote
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