yes or no for gears?

GMstomper · Mar 4, 2004

What RPM range are you lookin at with 3.55's or 3.73's on AOD car...same as a T-5???

_jb_ · Mar 4, 2004

GMstomper said:
What RPM range are you lookin at with 3.55's or 3.73's on AOD car...same as a T-5???

The RPMs would go a lot higher...well maybe not a lot, but more than the T-5

Gearbanger 101 · Mar 4, 2004

_JB_ said:
The RPMs would go a lot higher...well maybe not a lot, but more than the T-5

Actually, they're about he same. .68-.70 O/D gear.

Highbredcloud · Mar 4, 2004

As regards to the RPM with 3.55 or 3.73 for an AOD or the T-5...RPM's will be higher with the AOD since the AOD only has 4 gears with both the 3.55 and 3.73's...the RPM's will be lower with the T-5 since it has one more gear...

IndyBlk5.0 · Mar 4, 2004

generally speaking, T5 = 3.73 AOD=4.10

willys1 · Mar 4, 2004

GMstomper said:
Went from 2.73's to 3.27's and loved it. May go higher now that I'm starting all over again (she was in hibernation for 2 years!) and shes not my dily driver. But I'm not sure about it with the AOD...dont want to burn thru second and third too quick. Also concerned about my cruising RPM's...especially since I have a problem driving under 75 on the highway. I keep driving faster the older I get. LOL

With 373's and an aod , at 80mph, Im doing exactly 2500rpm !! At 70 Im doing 2300,,and at 60 Im at 2100,,thats with a stock tire size!

leakyfaucet · Mar 4, 2004

Highbredcloud said:
RPM's will be higher with the AOD since the AOD only has 4 gears with both the 3.55 and 3.73's...the RPM's will be lower with the T-5 since it has one more gear...

No, the AOD has a taller overdrive.

leakyfaucet · Mar 4, 2004

1hot5.0 · Mar 4, 2004

Go with the gears. Although it is not cheap by any means, it is one of the best performance mods you will ever do to your car.

Highbredcloud · Mar 4, 2004

leakyfaucet said:
No, the AOD has a taller overdrive.

why do some of you find the necessity to disagree with me?

Before I converted my AOD I ran 3.73's...at 45MPH I was doing 2500 RPM while in overdrive...with my Tremec I'm at 1900 in 5th gear...that extra gear helps out with a rear differential swap.

willys1 · Mar 4, 2004

5spds rev higher then aod's,,the old saying,,410's in a aod equal 373's in a 5spd

Highbredcloud · Mar 4, 2004

willys1 said:
5spds rev higher then aod's,,the old saying,,410's in a aod equal 373's in a 5spd

That's because the gear ration in an AOD is 2.48 as the first gear and the 5 speed is like 3.27 on my Tremec and a T-5 has 3.35 or so...so if you were to put the same gears let say 3.73 on both the AOD and the T-5 the T-5 would still feel faster, hence you would have to put 4.10 in the AOD to compete with the 3.73 on the 5 speed...

SuperStang83 · Mar 4, 2004

Yes, of course get gears! At least 3.73's I would suggest!

Jakob

Gearbanger 101 · Mar 4, 2004

Acceleration aside, I still don't see what this has to do with highway cruising? The RPM between them in high gear is virtually the same. Yes, the gear spacing between the T-5's 1,2,3 is better than the AOD's 1 and 2, but they also both run a 1:1 ratio in 3rd (AOD) and 4th (T-5). The AOD and the T-5 both have the same .68-.70 O/D. The only difference is that the AOD has it in 4th (which isn't technically another gear, but an overdrive band) and the T-5 has it in 5th.

ill advised · Mar 8, 2004

Highbredcloud said:
Before I converted my AOD I ran 3.73's...at 45MPH I was doing 2500 RPM while in overdrive...with my Tremec I'm at 1900 in 5th gear...that extra gear helps out with a rear differential swap.

2500 @ 45mph in OD? I need to rethink gearing my aod (don't have the car yet). That is horrible. I don't know how to convert the numbers off the top of my head but wouldn't that put you well past 3000rpms at only 60mph? That doesn't sound right to me but I don't have experience with aods so...

eric88gt · Mar 8, 2004

Highbredcloud said:
why do some of you find the necessity to disagree with me?

Before I converted my AOD I ran 3.73's...at 45MPH I was doing 2500 RPM while in overdrive...with my Tremec I'm at 1900 in 5th gear...that extra gear helps out with a rear differential swap.

I don't want to be argumentative, but there was something wrong with your tranny if it was turning that many rpm's in od with 3.73's. With a properly operating lock-up with an aod and 3.73's you should be going 70-75mph at 2500rpm's. And FWIW a t-5 has a 0.68 overdrive, while the aod has a 0.67 overdrive.

Gearbanger 101 · Mar 8, 2004

My guess is that his tach is out to lunch, rather than his trans...

eric88gt · Mar 8, 2004

Gearbanger 101 said:
My guess is that his tach is out to lunch, rather than his trans...

I would have said the same thing, but apparently the tach works with the Tremec so I figured it was something in the tranny. Either way, something was wrong for it to be showing 2500rpm's at 45mph.

Gearbanger 101 · Mar 8, 2004

Maybe it was slipping....or my guess, hadn't shifted into O/D yet?

leakyfaucet · Mar 8, 2004

eric88gt said:
And FWIW a t-5 has a 0.68 overdrive, while the aod has a 0.67 overdrive.

I thought I was right

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