Gears Auto vs manual & hp loss auto vs manual

jivepepper · December 24th, 2008, 02:33 AM

If the 4R70W as a 3rd gear ratio of 1 to 1 would I be fine at the track with the 3.73's I have now. Will I run out of gear, or be geared to high now?

How much hp will I lose on the dyno compared to the standard. I have dynoed twice on two different dynos one was 572 and the other was 598. The one I go to regularly seems to read lower than others I have been on.

I know I have had a lot of auto tranny questions lately but I'm in the research and development stage of my swap lol.

Prepared to be bored with newb question over the next 3 months or so.

SWEET2KSTANG · December 24th, 2008, 03:02 AM

the better the parts you install in the auto set up, the less parasitic loss you will have. a good converter, manual valve body, and if you were to do clutches etc, loss will be the same as a manual trans. if you are passing thru the traps now in 4th, you will be doing the same in 3rd as the manual. i personally would go a 4.10 with an auto, the auto can fully utilize the steeper gear.

jivepepper · December 24th, 2008, 03:16 AM

Originally Posted by SWEET2KSTANG

the better the parts you install in the auto set up, the less parasitic loss you will have. a good converter, manual valve body, and if you were to do clutches etc, loss will be the same as a manual trans. if you are passing thru the traps now in 4th, you will be doing the same in 3rd as the manual. i personally would go a 4.10 with an auto, the auto can fully utilize the steeper gear.

I'm right at the end of my power band with the 3:73's. I have hit the rev limiter right after the traps because I held it a little long. Do you still think I could take advantage of the 4:10's?

SWEET2KSTANG · December 24th, 2008, 03:16 AM

yes.

Smoothgrandmama · December 24th, 2008, 03:17 AM

You will be in overdrive

SWEET2KSTANG · December 24th, 2008, 03:21 AM

the transistion time for shifting in a manual, gear ratio between the manual and auto, power curve, etc will allow the auto to fully utilize the steep gearing. the first 300ft will be a huge difference just going to the auto. the steep gearing goes thru so fast in a maual car, an auto can (usually) plant the power a lot better and deliver the full use of the gearing/torque. not to mention the auto will absorb shock a lot better than slamming the gears in a manual.

jivepepper · December 24th, 2008, 03:25 AM

I do not want to be in overdrive acrossing the traps I'm affraid I'll burn it up.

SWEET2KSTANG · December 24th, 2008, 03:36 AM

then you amy want to go to a 3.55. going into 4th isnt what hurt a trans, its when you run fast enough that the converter tries to lock up. when the converter tries to lock up at those speeds, is when damage will occur.

jivepepper · December 24th, 2008, 03:46 AM

Originally Posted by SWEET2KSTANG

then you amy want to go to a 3.55. going into 4th isnt what hurt a trans, its when you run fast enough that the converter tries to lock up. when the converter tries to lock up at those speeds, is when damage will occur.

I will have the od and the lockup on toggle switches, but I plan engaging it after shifting to 3rd.

December 24th, 2008, 02:33 AM	#1
jivepepper MM Fanatic Join Date: Mar 2006 Location: Under a sombrero Posts: 4,564 iTrader: 1 reviews	Gears Auto vs manual & hp loss auto vs manual If the 4R70W as a 3rd gear ratio of 1 to 1 would I be fine at the track with the 3.73's I have now. Will I run out of gear, or be geared to high now? How much hp will I lose on the dyno compared to the standard. I have dynoed twice on two different dynos one was 572 and the other was 598. The one I go to regularly seems to read lower than others I have been on. I know I have had a lot of auto tranny questions lately but I'm in the research and development stage of my swap lol. Prepared to be bored with newb question over the next 3 months or so. __________________ 2000 GT 665/540rwhp/rwtq Best 1/4: AT 431HP 12.29 @ 124 AT 515HP 11.24 @ 129 AT 638HP 11.01 @ 135 AT 665HP ??.?? @ ??? 80+day, 1400' track, 10.5" DD Cobra R's & 315/35/17DR'S Trap speed = true measurement of HP. Last edited by jivepepper; December 24th, 2008 at 02:40 AM.*

December 24th, 2008, 03:02 AM	#2
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	the better the parts you install in the auto set up, the less parasitic loss you will have. a good converter, manual valve body, and if you were to do clutches etc, loss will be the same as a manual trans. if you are passing thru the traps now in 4th, you will be doing the same in 3rd as the manual. i personally would go a 4.10 with an auto, the auto can fully utilize the steeper gear. __________________ project warhorse under construction being built by MP2 Performance

December 24th, 2008, 03:16 AM	#4
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	yes. __________________ project warhorse under construction being built by MP2 Performance

December 24th, 2008, 03:17 AM	#5
Smoothgrandmama MasterDeBater 12 GT 8.46@88 1/8 Join Date: Apr 2007 Location: Willis,Texas Posts: 6,902 iTrader: 6 reviews	You will be in overdrive __________________ Join The MM Facebook: Modded Mustangs Facebook Vote For Modded Mustangs Ride of the Month Eskimo Brothers To Smooth: Safi, Blitz34, Graystang01, WillTheThrill, Bwal

December 24th, 2008, 03:21 AM	#6
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	the transistion time for shifting in a manual, gear ratio between the manual and auto, power curve, etc will allow the auto to fully utilize the steep gearing. the first 300ft will be a huge difference just going to the auto. the steep gearing goes thru so fast in a maual car, an auto can (usually) plant the power a lot better and deliver the full use of the gearing/torque. not to mention the auto will absorb shock a lot better than slamming the gears in a manual. __________________ project warhorse under construction being built by MP2 Performance

December 24th, 2008, 03:25 AM	#7
jivepepper MM Fanatic Join Date: Mar 2006 Location: Under a sombrero Posts: 4,564 iTrader: 1 reviews	I do not want to be in overdrive acrossing the traps I'm affraid I'll burn it up. __________________ 2000 GT 665/540rwhp/rwtq Best 1/4: AT 431HP 12.29 @ 124 AT 515HP 11.24 @ 129 AT 638HP 11.01 @ 135 AT 665HP ??.?? @ ??? 80+day, 1400' track, 10.5" DD Cobra R's & 315/35/17DR'S Trap speed = true measurement of HP. Last edited by jivepepper; December 24th, 2008 at 03:28 AM.*

December 24th, 2008, 03:36 AM	#8
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	then you amy want to go to a 3.55. going into 4th isnt what hurt a trans, its when you run fast enough that the converter tries to lock up. when the converter tries to lock up at those speeds, is when damage will occur. __________________ project warhorse under construction being built by MP2 Performance

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