4l60E

[Cutlass]

when cruiseing around town I always have it in 3rd.
have been told this will limit the auto. from shifting like in 35mph traffic that will speed up a little then slow down if it;s left in 3rd it will stay in 3rd.

I leave it in 3rd entering the expressway and getting into my left lane spot, then shift to OD around 75-85+MPH

the more shifting = more wear.

Someone correct me if I'm wronge on the 3rd theory.

plus you take off quicker in 3rd & the exhaust sounds cooler in 3rd which is usally 500RPM higher than OD.

Yeah you're pretty much correct. Sounds like you have a specific need to use 3rd in traffic around 35 mph and thats fine. My theory is: "Its an automatic transmission. It shifts into the gear that it thinks it should be in for the best performance/mileage. If your just driving around then put it in OD and let it do its thing."
"the more shifting = more wear" is true, but its a transmission and it built to be able to shift and last a long time doing it.
Driving around in 3rd usually builds more heat in the fluid and that can do more damage then good.

[Z28_Driver]

the sun gear broke into 2 pieces in my stock trans.
after having it rebuilt i added a transgo shift kit.
i did very little manual shifting before the rebuild.
transgo claims the car is now safe to shift manually.
do you all think its safe to shift manually?

i've only done it a couple times since the rebuild and shift kit.
and it definately hits 60 in first.

[64MonGooSe64]

Ive been shifting my mine manualy for some time now, and i havent seen any signs of problems and i do not have a shift kit, I mean the way i see it is the tranny is pritty simple 1st gear is 1st gear an wont leave it, 2nd is 2nd and even from a dead stop it will try and pull away in 2nd, and drive is drive which means if u put it into 3rd and the tranny thinks this is not a good idea all its gonna do is put it back down into 2nd, and obviously OD is just another useless shift and really doesnt need to be used untill u cruise at about 80 or 90

[64MonGooSe64]

i figure if u do an adverage of 2 extra shifts every 10 miles, 1 up the gear box and 1 down the gear box, thats 20 shifts every 100 milles, and 200 shifts ever 1,000 miles, and 20,000 shifts every 100,000 miles... I just think doing 20,000 less shifts is a good idea for me, and plus u wont "burn out" ur overdrive (just use it when u need it).

[HUMPTY]

Can the shift points be changed with a Snap-on MTG2500

[Cutlass]

Snap On?? lol.
Nope. I think that's just a scan tool.

[HUMPTY]

thanks, snap On, insurance replacement have not had chance to read manual. can the MTG2500 make any LS1 changes?

[Cutlass]

nope. I don't think Snap-on sells anything that can change the computer programming. You'd need HPTuners, EFILive, or a hand-held programmer.