There is a bunch of other stuff that can be done but it requires dropping the valve body so I will leave that stuff out since most ppl dont want to go through all of the hassle to do so nor do they want a trans that shifts like a full manual valve body pro mod trans (its brutal during light throttle driving). Most any shop that has a little gray matter will know what Im talking about (if they dont then turn and walk.no, run the other direction). If youre not familiar or comfortable tinkering with the trans then pick up an 87-up 700R4/4L60E ATSG manual (~$12 off the net/ebay) and you will find about everything Ive mentioned in that manual as well as what the parts look like and where they are located or you can take it to your local trans shop. Basically, the HD units are used as work/construction vehicles so the owners/drivers dont care or even notice the firmer shift. They leave the ball in on everything else due to customer complaints of "harsh shifts". BTW, GM leaves the check ball out in HD units fromt the factory to increase the durability of the TCC in heavy vehicles so its not a hack job/shade tree type mod. 500 boost valve the TCC apply will feel like another gear s that firm. With both the retainer and check ball removed and a. 500 boost valve if you remove them both as the line pressure drops some when removing the ball/retainer and your line pressures will be too low with the stock boost valve. If you really want a firm TCC (torque conv clutch) apply then remove BOTH the check ball and its retainer from the turbine shaft.
If the trans is out of the car now or at some point be sure to remove the check ball thats in the end of the turbine shaft (input shaft) this will give you a more positive torque converter clutch engagement which makes the torque conv last longer under spirited driving. This can be done by dropping the pan and removing one snap ring and gives you higher line pressure which equals firmer shifts.
#4l60e shift kit for towing install
Something else that you can do is pull the pressure regulator line up out of the front pump and install a. By adding the extra spring you are increasing the amount of pressure it takes to compress those springs on the 2nd gear apply which equals firmer 1-2 shift. These springs act like a water hammer arrestor in your home plumbing so basically all they do in a auto trans is when the servo applies the spring compresses cushioning the shift engagement. This spring comes stock on syclone/typhoons and some vettes (not all those trans's got the spring for some reason). While youve got the 2-4 servo line up out install an extra spring inside the existing spring under the 2nd apply spring retainer. You can pick these up on ebay/the net or your local trans rebuilder for a couple of bucks (dont pay more than $25 for it new). Anyways, pull the 2-4 servo cover and either make sure you have the "093" vette/hi po 2nd apply servo or install one if you dont. That being said would you like to have firmer shifts for 50 bucks or so? If youre interested and dont mind spending a few hours swapping some parts then read on.įirst thing is to make sure that the trans is in good health because if it has a bazillion miles on it then anything you do is just a temporary fix at best. Bascially they are better than B&M, the "fake" Art Carr, and some others that are sold over the net (import/poor quality) but youll hear some trans ppl talk about how much they hate them.
I've done the swap a couple times and going off my memory, I don't think I forgot anything.To answer your question their shift kits are of "ok" quality. While you are at it, tune other parameters and you will gain some power you can do this with efilive/hptuners/or go somewhere and have them program it for you. Regarding the computer, the computer can control it, but it needs to be reprogrammed. Wiring harness to convert from a 4L60E transmission to a 4L80E transmission (1998 up LS1 type computer only).
The main 4l60e harness plug will not work with the 4l80e. You have to modify the cross member, as the transmission mounts differently. theres several different output shafts for 4l80e, depending on the yoke you get, you may need to trim it to fit correctly. You need a different yoke, TH400 slip yoke. Torque Converter / Flexplate need to be changed out. 4l80e and 4l60e are slightly different, non 'bolt' right up.
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