Man shift it or leave it in D

98T/Aformula · 05-15-2007, 01:51 PM

When at the track I always leave it in drive and let the computer take care of the rest, but I keep getting ppl, mainly the old school guys, telling me I should put it in first and man shift it up to drive ? They say it is ez'er on my tranny, just looking for your guys 2 cents...btw I have tryed it and it seems like the computer takes over anyways ?

**BIG D's SS** · 05-15-2007, 01:53 PM

I always manually shift, but that is just me. Get just a little bit extra out of each gear.

**silverbullit1972** · 05-18-2007, 08:53 PM

the computer can not miss a shift member

**Too Fast** · 05-18-2007, 10:31 PM

Originally Posted by 98T/Aformula

When at the track I always leave it in drive and let the computer take care of the rest, but I keep getting ppl, mainly the old school guys, telling me I should put it in first and man shift it up to drive ? They say it is ez'er on my tranny, just looking for your guys 2 cents...btw I have tryed it and it seems like the computer takes over anyways ?

Well,,,,,,,,,,,,,,with my 98 when I let the computer do the shiftin' I was ALWAYS .2 to .3 tenths slower. I would manually upshift just as or just before I felt the rev limiter. Need to time the shift so that happens. I don't think it is any easier either way.

**Sarge** · 05-19-2007, 02:58 AM

4L60E's engage only 3 clutch packs when launching in drive.....I launch from 3rd...that engages all the clutch packs...then shift from 3rd to drive when appropriate.....better launches...easier on the trannie.....less shifting....

**JwMonE99** · 05-19-2007, 07:46 PM

Originally Posted by Sarge

4L60E's engage only 3 clutch packs when launching in drive.....I launch from 3rd...that engages all the clutch packs...then shift from 3rd to drive when appropriate.....better launches...easier on the trannie.....less shifting....

Thats how I do it

**djvaly** · 05-19-2007, 09:09 PM

Originally Posted by JwMonE99

Thats how I do it

same here on the street. I raced from 50 roll and the computer downshifts first so there's a half sec lag, but the I manually put it in 3rd and floored it and it was better response.
never tried 3rd to D at the track. I guess as soon as 5500 rpm hits in 3rd I can manually do a D.

**Sarge** · 05-20-2007, 11:31 AM

You got it.

**Pro Built Automatics** · 05-20-2007, 05:55 PM

If you are going to let it shift on its own, use "OD" not "D". This will prevent the overrun clutch from robbing 2-3 shift oil on the 2-3 shift. When you use "D", the overrun clutch comes on on the 2-3 shift taking away oil from 3-4 clutch apply. Either manually shift it, which uses the overrun clutch on all three positions 1, 2, 3, thereby not robbing any of the 3-4 clutch apply oil. The overrun clutch is not on & never comes on in the "OD" position. Same for the 700R4.