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Hello all, a pretty basic question..but I am looking to install a Trans Go Shift kit into my 2004 automatic right after I get my 3.42 gears installed next week.
Looking at Summit and the Trans Go website I see there are about three levels of kits.
My question is....which one and what is the difference? I want a snappy shift but I don't want to break the transmission or overrev all the time but want the shift improvement I read about with the ability to fully manually shift through 1st, 2nd and 3rd with D (overdrive) maintaining normal full automatic shifting.
Shift kits are great for a 350, or 400 Turbo transmission. BUT-If I were you, I'd avoid a shift kit for a stock internals 4L60E. I'm speaking with some experience on this. But first, let's get this part out of the way:
☆I have a 2000 C5 Vert.
☆My 4L60E is now 23 years old, over 130,000 trouble free miles.
☆It is totally stock inside.
☆I've made at least 50 dragstrip runs with it.
☆The only service ever done to it was a fluid and filter change at 100,000 miles, which I did myself, nothing in the pan but red fluid.
☆NOW-the interesting part. Theres been an LS7 engine in it with over 600 crankshaft horsepower for the last 17 years/70,000 miles.
Theres been a 3,200 rpm Yank stall converter in it for 17 years/70,000 miles.
I have a friend who rebuilds 700R4s, 4L60s, and 4L60E transmissions. He's pretty good at it, too, if I do say so myself. He's told me that at least 1/3-1/2 the transmissions he rebuilds in Fbodies and C5 Corvettes have had shift kits and/or torque management removed by a tuner. He told me that when a trans has had both a shift kit installed, AND torque management removed, it's a 1-2 kiss of death for a STOCK INTERNALS 4L60E transmission! I'm not a trans guy, but do understand how they basically work. I did see what my tuner did, and listened to what he said. He didn't REMOVE torque management, but he dramatically RAISED the value. Stock was about 450-460ft lbs. He raised it to like 1,000ft/lbs, if I remember correctly (it's been 17 years!), shortened the shift time that it takes when going from 1st to 2nd, 2nd to 3rd (drive), and 3rd to OD. I think he also raised line pressure SLIGHTLY. You can do a lot today just by reprogramming the PCM. I hope this helps you. IDK, my tuner must've done something right, or my trans would've been toast long ago.....
Yes, a trans kit which increases firmness of shifts is more likely to break the sun shell in the 4L60E. 3.42 rear drive gears do help in that regard because the rear tires become more likely to break loose at lower (higher numerically) rear drive ratios
It is likely that your car will need a reprogram of the PCM when going to 3.42 in order for shift points to be correct. My car absolutely did when going from 3.15 to 3.73--otherwise rev limit was hit in 2nd and no shift without lifting.
Modified 4L60E transmissions feature a much stronger sun shell. If the sun shell breaks, the trans has to come out for repair.
Yes, a trans kit which increases firmness of shifts is more likely to break the sun shell in the 4L60E. 3.42 rear drive gears do help in that regard because the rear tires become more likely to break loose at lower (higher numerically) rear drive ratios
It is likely that your car will need a reprogram of the PCM when going to 3.42 in order for shift points to be correct. My car absolutely did when going from 3.15 to 3.73--otherwise rev limit was hit in 2nd and no shift without lifting.
Modified 4L60E transmissions feature a much stronger sun shell. If the sun shell breaks, the trans has to come out for repair.
Trans Go Shift Kits - Which One
