Why did you get 3.73 Gears?

[Midnight]

Question.. i am interested in getting new gears.. but heard that 4.10's will increase my 65MPH RPM to 2,300 to 2,400

with my current setup, i can go 85MPH on 2,300 RPM... so, sure its going to help my torque and all that jazz.. but at 65MPH.. with 4.10 gears, im going to be really burning that petrol! and 85MPH.. is going to be crazy.

Im sure people put 3.73's on for a smilar reason.. and interested in where the 65mph rpm's will be sitting.. to see if changing the gears, is a justifiable venture.

so if anyone has them, and could shed some light... as Bill Lumburgh says... "That would be great..... MMKKAY??"

:help:

[Bluerauder]

Question.. i am interested in getting new gears.. but heard that 4.10's will increase my 65MPH RPM to 2,300 to 2,400

with my current setup, i can go 85MPH on 2,300 RPM... so, sure its going to help my torque and all that jazz.. but at 65MPH.. with 4.10 gears, im going to be really burning that petrol! and 85MPH.. is going to be crazy.

Im sure people put 3.73's on for a smilar reason.. and interested in where the 65mph rpm's will be sitting.. to see if changing the gears, is a justifiable venture.

so if anyone has them, and could shed some light... as Bill Lumburgh says... "That would be great..... MMKKAY??"

:help:
I think most folks here will argue that 3.73's won't make that much of a difference from the OEM 3.55's and would consider it a waste. Most have elected to go with the 4.10s to move the beast out of the hole quicker.

Decrease is gas mileage is reported as about 1-2 MPH and those that want the low end torque don't seem to mind that price.

[SC Cheesehead]

You'll see about a 200 rpm increase over your 3:55's. At 75 mph I'm running right about 2,500 rpm.

As far as mileage goes, at highway speeds I've seen about 1 1/2 mpg difference, IMO, well worth it for the increased low end performance the 4:10's have given me.

[musclemerc]

Babbage is running a 3:73. Why go through the trouble for just a slight step?

[fastblackmerc]

You'll see about a 200 rpm increase over your 3:55's. At 75 mph I'm running right about 2,500 rpm.

As far as mileage goes, at highway speeds I've seen about 1 1/2 mpg difference, IMO, well worth it for the increased low end performance the 4:10's have given me.

+1

IMHO.... it's a waste to go to 3.73's.... go with 4.10's

[babbage]

Babbage is running a 3:73. Why go through the trouble for just a slight step?

At 85 I'm running exactly 2500 rpms. I like to take long trips in the summer and will comfortably sit at 80+ for hours.

My car with 3.73 is faster than ANY N/A MM with 4.10's - and stock exhaust. ;) Pretty sure. I'm faster than any NA in this thread so far..


With 4.10's at speed (100ish+) you can hurt your driveline, tailshaft etc...
I have the elite alcoa composite driveshaft with my 3.73 gears so I can still "safely" go 140+ :burnout:


Ok is that enough reasons? To each their own, I love my setup.

[SC Cheesehead]

Babbage is running a 3:73. Why go through the trouble for just a slight step?

^^^^^^What he said. ^^^^^^

3.55's to 3.73's will lower your ratio about 5%

3.55's to 4.10's will lower your ratio about 13%

IMO, not worth the time and expense for the slight change from OEM to 3.73's

Now if you were a CV guy running 2.90's the 3.73's would be a big jump (22%).

[babbage]

+1

IMHO.... it's a waste to go to 3.73's.... go with 4.10's


:D Jim what's your 1/4 mile time?

[Blackened300a]

My car with 3.73 is faster than ANY N/A MM with 4.10's - and stock exhaust. ;) Pretty sure. I'm faster than any NA in this thread so far...

I should have posted sooner. ;)

[musclemerc]

At 85 I'm running exactly 2500 rpms. I like to take long trips in the summer and will comfortably sit at 80+ for hours.

My car with 3.73 is faster than ANY N/A MM with 4.10's - and stock exhaust. ;) Pretty sure. I'm faster than any NA in this thread so far..


With 4.10's at speed (100ish+) you can hurt your driveline, tailshaft etc...
I have the elite alcoa composite driveshaft with my 3.73 gears so I can still "safely" go 140+ :burnout:


Ok is that enough reasons? To each their own, I love my setup.

I have a stock 3:55 and never touched my trans or TC. Watch out with those call outs on who's faster you might get beat!

[fastblackmerc]

:D Jim what's your 1/4 mile time?

Low 14's....

With full tank of gas, spare tire, tools and trunk organizer.

I don't remove the headlight or lower tire pressure either.

I drive it to the track and race.

[fastblackmerc]

At 85 I'm running exactly 2500 rpms. I like to take long trips in the summer and will comfortably sit at 80+ for hours.

My car with 3.73 is faster than ANY N/A MM with 4.10's - and stock exhaust. ;) Pretty sure. I'm faster than any NA in this thread so far..


With 4.10's at speed (100ish+) you can hurt your driveline, tailshaft etc...
I have the elite alcoa composite driveshaft with my 3.73 gears so I can still "safely" go 140+ :burnout:


Ok is that enough reasons? To each their own, I love my setup.

I run 80+ for hours on my 4.10's also.

Come to Marauderville in Charlotte to backup your claim... I'm sure there will be takers.....

I've been at 120+ and NO driveshaft issues (stock driveshaft). Some MM's have issues some don't. I have a spare drive shaft that will be getting rebuilt and balanced jsut to be on the safe side.

[ctrlraven]

At 85 I'm running exactly 2500 rpms. I like to take long trips in the summer and will comfortably sit at 80+ for hours.

My car with 3.73 is faster than ANY N/A MM with 4.10's - and stock exhaust. ;) Pretty sure. I'm faster than any NA in this thread so far..


With 4.10's at speed (100ish+) you can hurt your driveline, tailshaft etc...
I have the elite alcoa composite driveshaft with my 3.73 gears so I can still "safely" go 140+ :burnout:


Ok is that enough reasons? To each their own, I love my setup.
^Wise guy :lol:

I'm faster and don't have 4.10s and still have stock 3.55 gears so :P


I should have posted sooner. ;)
I know right!

I wonder who currently is the fastest NA stock bore/stroke MM on the site? Once I get my 4.10 gears installed I will jump right past you Paul. Have fun playing catch up buddy! :beer:

[babbage]

^Wise guy :lol:

I'm faster and don't have 4.10s and still have stock 3.55 gears so :P


I know right!

I wonder who currently is the fastest NA stock bore/stroke MM on the site? Once I get my 4.10 gears installed I will jump right past you Paul. Have fun playing catch up buddy! :beer:

I have factory stock exhaust. You have Long Tube headers right?

[ctrlraven]

I have factory stock exhaust. You have Long Tube headers right?
I wished!!! Nope stock manifolds, 2nd cat delete, aero mufflers and res-delete tips, rest of piping is stock.

[musclemerc]

No reply on my PM Eric? What's up with that?

[babbage]

Low 14's....

With full tank of gas, spare tire, tools and trunk organizer.

I don't remove the headlight or lower tire pressure either.

I drive it to the track and race.

"Low 14's" = 14.4 is your best time with the 4.10's yes?

My timeslip proof (picture) is in my sig. I ran back to back 14.02's - that's fourteen point zero two. ;) Soon to be in the 13's - next week hopefully.

All I'm saying is my MM with 3.73's has plenty of get up and go. Gears do not change horsepower.

When you do change your rear gears - be sure to change the axle bearings and seals. You might even replace the carrier gear bearings since you are in there -- depending on miles and get a girdle. This makes any gear change more worthwhile. Break in the gears for 500 miles (take it easy) on dyno oil, then switch to synthetic. There is also a 3.90 ratio available.

Good luck.

[musclemerc]

Still no reply huh?

[babbage]

I wished!!! Nope stock manifolds, 2nd cat delete, aero mufflers and res-delete tips, rest of piping is stock.

Ahh, but that certainly isn't a factory exhaust.
And you have a 3500 stall converter too - right? BTW look at my cooler thread in the Trans forum...

[babbage]

Still no reply huh?

Ooops! I missed it. There! :burnout::D

[musclemerc]

Now it's on!

[MrBluGruv]

To the original question, somewhat, I haven't noticed a huge difference in my fuel economy. My driving style is to basically not waste any time getting going, so now that I have 4.10s I don't have to lay in it as hard, but I do a decent amount of highway driving, and I'm pretty sure my highway mpg is the only thing that suffered because on city streets and in the suburbs I'm not going fast enough in 4th (or 3rd if I'm going slow enough) to really go past the stall on my TC, no real difference.

[ctrlraven]

Ahh, but that certainly isn't a factory exhaust.
And you have a 3500 stall converter too - right? BTW look at my cooler thread in the Trans forum...
Never claimed it was lol but still no where near power comparison of what LTH can add. Yes I have a 3500 stall only thanks to Zack for getting my tune perfect so it actually increases performance and not decreases it. I've got very basic performance mods.

[juno]

Your RPM's in 4th will increase by about 15%.

I am in the 3.73 camp for my own reasons. I usually cruise at 85 or higher for long periods and I did not want to limit my 3rd gear speeds. (Sebring).
I am sure you would enjoy 4.10s though!!!!

[Joe Walsh]

There is also a 3.90 ratio available.

I'm a 'tweener' gear guy who does a lot of highway cruising...I have a set of Motive 3.90s.
I've heard that Motives are noisier gears, so I had them 'Cryo-Rem' treated.
Besides, my exhaust is loud...so I couldn't hear the gears anyway.
They won't get installed until I can find an inexpensive rear axle housing to do a complete seperate build with the 3.90 gears, 31 spline axles, Detroit/Torsen diff, studs, TCE brakes, SVO girdle/cover and welded axle tubes.
I can't have the Marauder up on stands for any length of time because it's now my daily driver...:(

Cryo-Rem:
http://www.evansperformance.com/cryoREM.html

[CBT]

Could an old CVPI rear not be used? Those things have to be a dime a dozen at a pick-your-part yard.



I'm a 'tweener' gear guy who does a lot of highway cruising...I have a set of Motive 3.90s.
I've heard that Motives are noisier gears, so I had them 'Cryo-Rem' treated.
Besides, my exhaust is loud...so I couldn't hear the gears anyway.
They won't get installed until I can find an inexpensive rear axle housing to do a complete seperate build with the 3.90 gears, 31 spline axles, Detroit/Torsen diff, studs, TCE brakes, SVO girdle/cover and welded axle tubes.
I can't have the Marauder up on stands for any length of time because it's now my daily driver...:(

Cryo-Rem:
http://www.evansperformance.com/cryoREM.html

[Blackened300a]

Ahh, but that certainly isn't a factory exhaust.
And you have a 3500 stall converter too - right? BTW look at my cooler thread in the Trans forum...

My exhaust is stock except for mufflers and res-delete tips. The manifolds, all 4 cats and stock pipes are all still in the car.


I wonder who currently is the fastest NA stock bore/stroke MM on the site? Once I get my 4.10 gears installed I will jump right past you Paul. Have fun playing catch up buddy! :beer:
Well unless someone runs faster then 13.6 NA, that would make me the current NA champ on stock internals. I made that run with only the trunk organizer removed. I was on my nittos with the spare in the trunk and a 1/4 tank of gas.
4.10s may earn you a 13.5 especially with the smaller rear tires, if you make the run soon, you'll hold the strap until colder weather when I give the crappy spaz intake which I have yet to try out and a full header/exhaust set-up with race gas tuning a run down the 1320. :P

I'm still deadset on this 12 second pass even though its taking a little longer then planned. ;)

[Joe Walsh]

Could an old CVPI rear not be used? Those things have to be a dime a dozen at a pick-your-part yard.

You would think!...(but it has to be a 2003 or later with the outboard rear shock mounts.)
Apparently every cab company in the world snaps these rears up as soon as they hit the junkyards.
Any CAMmer know of a cheap (I only need the housing) Panther 8.8" rear??

[babbage]

Well I'm hoping I get to join the 13 second NA MM club this Sunday! I'll be happy with that, we'll see.

[Blackened300a]

Well I'm hoping I get to join the 13 second NA MM club this Sunday! I'll be happy with that, we'll see.

Good Luck! What track you making the run at?

[ctrlraven]

My exhaust is stock except for mufflers and res-delete tips. The manifolds, all 4 cats and stock pipes are all still in the car.


Well unless someone runs faster then 13.6 NA, that would make me the current NA champ on stock internals. I made that run with only the trunk organizer removed. I was on my nittos with the spare in the trunk and a 1/4 tank of gas.
4.10s may earn you a 13.5 especially with the smaller rear tires, if you make the run soon, you'll hold the strap until colder weather when I give the crappy spaz intake which I have yet to try out and a full header/exhaust set-up with race gas tuning a run down the 1320. :P

I'm still deadset on this 12 second pass even though its taking a little longer then planned. ;)
Just wait to see what I run on 4.10 gears with street tires. The smaller drag radials gave me a 3.89 rear gear on stock 3.55 gears, on street tires and 4.10s I'll have a 4.04 and with drag radials will be 4.51 :P. I'm going to be faster than 13.5 with the smaller drag radials. The MSD 2-step launcher is going to come in handy also.

[MrBluGruv]

The MSD 2-step launcher is going to come in handy also.

Forgive me for derailing the thread but I've always wondered this: how would a 2-step launch control work with an automatic transmission?

[Blackened300a]

Forgive me for derailing the thread but I've always wondered this: how would a 2-step launch control work with an automatic transmission?

I would imagine it would make you more consistant. Im not sure about what else it would do when your convertor will dictate the max RPMS you can launch at.
Unless of course you neutral drop it at 5K :rolleyes:

[SC Cheesehead]

I would imagine it would make you more consistant. Im not sure about what else it would do when your convertor will dictate the max RPMS you can launch at.
Unless of course you neutral drop it at 5K :rolleyes:

Yoohoo, bawazir, new launch technique; guaranteed holeshot...:burn:

;) -------> :D

[Paul T. Casey]

At 85 I'm running exactly 2500 rpms. I like to take long trips in the summer and will comfortably sit at 80+ for hours.

My car with 3.73 is faster than ANY N/A MM with 4.10's - and stock exhaust. ;) Pretty sure. I'm faster than any NA in this thread so far..


With 4.10's at speed (100ish+) you can hurt your driveline, tailshaft etc...
I have the elite alcoa composite driveshaft with my 3.73 gears so I can still "safely" go 140+ :burnout:


Ok is that enough reasons? To each their own, I love my setup.

Just sayin' Paul T. Casey N/A 2.170 9.123@80.39 14.021@99.33

with 3.55 gears.

[Paul T. Casey]

Now, when can I find Mr. Babbage near a track.....

[Paul T. Casey]

Seriously though, if you want 13's, you can easily get them. Just go to the track on a raceday, not a test and tune day. Should be worth about .15 at most places.

[babbage]

Good Luck! What track you making the run at?

Esta Drags in Cicero, NY - but there is 30% chance of rain. :mad2:
Aren't there any good INDOOR drags?? :D

[babbage]

Now, when can I find Mr. Babbage near a track.....
;) Wait till I get my SW long tubes..

[Blackened300a]

;) Wait till I get my SW long tubes..

We may have to get all of us NA guys together for a track day when we get the mods completed.

[Paul T. Casey]

Okay. And like I said, go to an actual race event and not a T&T. You'll be very happy with the results.

[LeoVampire]

@ least make the gear change worth the trip inside the rear end as others said.

Upgrade the outer axles and carrier to a 31 spline set up and change all of the bearings and seals as well.

Just changing the gears isn't worth it in my eyes but it is your money and decision ultimatly.

[ctrlraven]

@ least make the gear change worth the trip inside the rear end as others said.

Upgrade the outer axles and carrier to a 31 spline set up and change all of the bearings and seals as well.

Just changing the gears isn't worth it in my eyes but it is your money and decision ultimatly.Def if it's an 03. The 04's had a little better hardware back there. I had my axles out about 2-3k miles ago and they were clean and good after 135k miles of use so far. If you got the extra money and plan on getting bigger and powerful mods down the road, yes it all makes sense to open it once do everything and not worry about it again.

[LANDY]

on my previous MM it had all bolt ons but a TC, and water pump, i made consistant 13.80 at 100mph on a 93 octane tune at sshs9 last november. with the 3500stall that came in the mail a day before the accident, i think 13.3 would of been an easy task.
and watch out for Paul T Casey, he will be right on that tree like there is no tomorrow. the man does not play in the 1/4 mile.

[BUCKWHEAT]

I ran 4:30s for 40,000 miles and got 19mpg on the highway. I just went to the 3:73s because of the incessant tire spin with the 4:30s. I need a retune and then to the track for the results. Already have the 31 splines & Auburn LSD.