3.73 in a auto?

[00firebird]

ive heard rumors that 3.73's can stress the drivedrain or whatnot, also they are not good to put in automatics. what's really true ?

[99v6cam]

No, you'll be fine with 4.10s, so you'll definatly have no problems with 3.73s [img]smile.gif[/img]

[00firebird]

what will be my top speed? I've been it could go down alot, and also that the top end loss is so high that it wouldnt hit before 120 anyway.

[Th3 RiCk]

Go with 3.73's or 4.10's. It's very unlikely you would ever see 120mph in a NA 3.8 F-body heading down a 1/4 mile track anyways.

[RallyRed 98]

theoretical top speed with 3.73s is around 170 something...

you'll get into your speed limiter before you have to worry about losing top end. you do lose top end, but nothing you can actually "use." think of that top end like when you lost your baby teeth: you might have been surprised at first, but you knew there were greater things in store.

people who say you'll lose a lot of mileage or top end don't have 3.73s.

[chadder]

Originally posted by RallyRed 98:
theoretical top speed with 3.73s is around 170 something...

you'll get into your speed limiter before you have to worry about losing top end. you do lose top end, but nothing you can actually "use." think of that top end like when you lost your baby teeth: you might have been surprised at first, but you knew there were greater things in store.

people who say you'll lose a lot of mileage or top end don't have 3.73s.

you will lose a TON of top end and GUZZLE GAS LIKE CRAZY!!! [img]graemlins/rofl.gif[/img] [img]graemlins/rofl.gif[/img]

[Razzer]

You will lose some gas milage, if you had 3.08's to 4.10's theres a 25% difference in rpms that you will gain through each gear. That means greater torque but with higher rev's to achieve the same speed of the 3.08's.

3.08's @ 120mph=4776 rpms
3.42's @ 120mph=5303 rpms
3.73's @ 120mph=5784 rpms
4.10's @ 120mph=6358 rpms

I believe the calc is using a 1:1 drive line ratio with 26" tires. Using overdrive you will get 25 to 30% fewer rpms.

[BirdOfPrey01]

go with 4.10, you will regret it if you don't, same price... why not go the extra mile?

drivability will not be a problem

you got overdrive

[WishIHad$$$]

Originally posted by RallyRed 98:
theoretical top speed with 3.73s is around 170 something...

you'll get into your speed limiter before you have to worry about losing top end. you do lose top end, but nothing you can actually "use." think of that top end like when you lost your baby teeth: you might have been surprised at first, but you knew there were greater things in store.

people who say you'll lose a lot of mileage or top end don't have 3.73s.

4th gear @6000RPM w/3.73's = 177mph
3rd gear @6000RPM w/3.73's = 123mph

With 4.10's, you would be hitting 112 in 3rd and 161 in 4th.

[FireFighter]

You guys are nuts, Unless it's going to be a fulltime drag car their should be no need for 4.10's or even 3.73's really. I would go with 3.42 for the best match of performance, milage and reliablity. You can use 3.73's But 4.10's are way overkill. I don't know why everyone have gone on a lower gear ratio rampage tho?!?! Thanks god for computer tuning tho, thats all I have to say.

[BLLDOGG]

there is no problems with using 3.73s or 4.10s.

[FireFighter]

Originally posted by BLLDOGG:
there is no problems with using 3.73s or 4.10s.

Really, Well explain to me why you want/need them on a daily driver then? I didn't say their was something wrong with them I said the are overkill in a auto.

[Ju5t_B3at_Me2005]

with 3.73's or 4.10's what would the cruising rpm's be at say on the highway at 60-80 mph. if i got gears i wouldnt want my rumbler to be unbearable on long trips, which will probably be in my future (travelling from home in miami to college in no. fla.)

how much time will be shaved from my 1/4 time as compared with my 3.42's??

[FireFighter]

Originally posted by Ju5t_B3at_Me2005:
with 3.73's or 4.10's what would the cruising rpm's be at say on the highway at 60-80 mph. if i got gears i wouldnt want my rumbler to be unbearable on long trips, which will probably be in my future (travelling from home in miami to college in no. fla.)

how much time will be shaved from my 1/4 time as compared with my 3.42's??

Depends on what trans you have and if you have had your car reprogramed. I wouldn't put 4.10's in anything but a full time drag car or a v8 with a 6 spd. Going down to 3.73's will probaly drop you at most .2's and 4.10's up to .5 but its going to kill you mph.

[95Batmobile]

Originally posted by FireFighter:
</font><blockquote>quote:</font><hr />Originally posted by Ju5t_B3at_Me2005:
with 3.73's or 4.10's what would the cruising rpm's be at say on the highway at 60-80 mph. if i got gears i wouldnt want my rumbler to be unbearable on long trips, which will probably be in my future (travelling from home in miami to college in no. fla.)

how much time will be shaved from my 1/4 time as compared with my 3.42's??

Depends on what trans you have and if you have had your car reprogramed. I wouldn't put 4.10's in anything but a full time drag car or a v8 with a 6 spd. Going down to 3.73's will probaly drop you at most .2's and 4.10's up to .5 but its going to kill you mph. </font>[/QUOTE]3.73s made my city mileage go up..
In A LOT of people's opinions, 3.73s are the perfectly balanced gear. If I dont go 95 miles an hour home, I still get 28-29mpg highway too.