more power, ditch the 4.10s?

[ImpalaSlayer]

well when i have the 4.10s put in i originally had no intentions of boost, well that quickly changed. now that i have more power ive been thinking of putting the 3.55s back in especially once i put my new motor in and the power gets bumped up even more. i know the pros and cons of each, just wondering what most of you boosted guys are running.

[musclemerc]

I'm not boosted but just wondering what you have for CA's Dave? I could only imagine how easy it is to break the tires loose with the 4:10's

[ImpalaSlayer]

I'm not boosted but just wondering what you have for CA's Dave? I could only imagine how easy it is to break the tires loose with the 4:10's
i got a set of Z&Ms, from a dig, they go up in smoke with 4.10s and a 3500 stall

[BAD MERC]

I gave my 3.55's to my brother for his Mark VIII. I had NO intention of putting them back in. I will be doing boost ASAFP though.

[Joe Walsh]

Dave, I have a set of 3.90s that I've been waiting to install, but now that I will be boosted soon. (probably this Fall)
I think that I am keeping the 3.55s in the rear diff.
Instant torque from an Eaton probably makes steep gears less desirable, unless you drag race often.

BTW: How does the high stall feel/drive with the Eaton's low end grunt?

Now I've got to decide what to do with the Art Carr high stall that is in the car...:hmmm:

[Mr. Man]

What are you putting in Aluminator or Terminator? Or are going to squeeze a 5.4 in there.

[ImpalaSlayer]

Dave, I have a set of 3.90s that I've been waiting to install, but now that I will be boosted soon. (probably this Fall)
I think that I am keeping the 3.55s in the rear diff.
Instant torque from an Eaton probably makes steep gears less desirable, unless you drag race often.

BTW: How does the high stall feel with the Eaton's low end grunt?

Now I've got to decide what to do with the Art Carr high stall that is in the car...:hmmm:

Joe, thats basically what im thinking, i only take the car to the track to see what it will do after ive done a major change. i also have a high stall ill have to yank out after i pull the motor.


What are you putting in Aluminator or Terminator? Or are going to squeeze a 5.4 in there.

im building up a termi, just a basic build for reliability, nothing fancy

[Joe Walsh]

When that stall 'hits' does it blow away the tires instantly?

[Mr. Man]

Joe, thats basically what im thinking, i only take the car to the track to see what it will do after ive done a major change. i also have a high stall ill have to yank out after i pull the motor.



im building up a termi, just a basic build for reliability, nothing fancy

I see you getting more conservative with age:lol:

[CWright]

I'm running the stock 3.55's. Very much like!:D

[RF Overlord]

well when i have the 4.10s put in i originally had no intentions of boost, Same here. I like them just fine with the Trilogy, especially with 295s on the back. Now I need to go 31 spline...

I say leave them in.

[Got_1]

i got a set of Z&Ms, from a dig, they go up in smoke with 4.10s and a 3500 stall

jealous!!:burn:

[1 Bad Merc]

I left the 4.10's on my car. Tires go up in smoke when I really hit it hard. If I just ease into the throttle no problems with stock BFG's-a little slippage when you hit second gear. I have a set of widen rims and I am going to put some drag radials on when I want to race. I still have the 28 inch splines so I dont know how hard I want to leave on the drag radials. I am going to play with it. If the 4:10's are in I would leave them.

[LANDY]

On mine the 4.10s and the 3500stall it will instanly break the tires loose from 30mph and down. Then again we have diferent blowers. I also wonder how the car would behave with the 3.55 back on. I just dont want it to be a dog while cruising.

[joemama]

I got 4.10s and am running a trilogy TS. Love it. You can roast the tires at will with any gears...you will be quicker at the track...and that is always good. Quicker is better. imho. I am still working on my launch but I expect being in the 11's this fall, no problem. :banana2:

[ImpalaSlayer]

hmmm seems like most keep them in. maybe ill compromise and run 3.73s

[DOOM]

3:55's + Roots blower = WIN!!! :D

[ImpalaSlayer]

3:55's + Roots blower = WIN!!! :D

kinda what im thinking Doom, like you always say, its a street car, not a race car. with over 500hp i dont think ill need the 4.10s

[Joe Walsh]

If you do a lot of highway driving you can't beat the pull of a set of 3.55s from 50 to 80, 90 , 100, etc.

I put a set of 3.55s in my Mustang to replace the OEM 3.08s and I loved the acceleration out of the hole, but it wasn't as satisfying to downshift on the highway with the 3.55s...the OEM 3.08s would pull!

It all comes down to how much torque you are putting down....gears basically help a car that is heavy or lacking torque...or both.

[Vortech347]

Stick with the 4.10's. We have 3.55's in our 01' and the wife and I hate them in that car. It had 4.30's but I swapped IRS's.

[BUCKWHEAT]

well when i have the 4.10s put in i originally had no intentions of boost, well that quickly changed. now that i have more power ive been thinking of putting the 3.55s back in especially once i put my new motor in and the power gets bumped up even more. i know the pros and cons of each, just wondering what most of you boosted guys are running.

I ran 4:30s with boost for years. Recently went down to 3:73s. Track 60 foot times improved since less tire spin, but I could notice the slower end of track speed. Stay with the 4:10s untill you know you have too much spin, then edge down to 3:90 or so. Don't go below 3:73. Just a thought. Oh, mine is dynoing recently at 464hp, with a low 9 degrees of advance..

[RoyLPita]

What about putting the stock converter back in and keeping the 4.10s?

[LANDY]

What about putting the stock converter back in and keeping the 4.10s?
That is actually a good thing to try first restall your tc to alower stall and upgrade it to a tripple disc. Then see how you like ith

[GAMike]

From what I have heard, Joe and Brian are spot on......... I'm not knowledgable enough to offer an opinion as I just try to drive the hell outta whatever is underneath me.:D

I like a car with highway legs, and was thinking that swapping the gear might give me some omph in the midrange. The first thing ppl. who know (Scott Levine @ Team Toyland) asked was "what stall is in the car", before they offered an opinion on what to do.......

He proceeded to tell me that 2700-2800 was all that was needed for a "Roots" blower.......3000+ is a waste of torque.... On a centri blower tho his opinion is just the opposite. Anywho, thought I would share.......

Oh, and 4.10's with a Trilogy (or in your case Eaton...I do distinguish hehehe- just for the hell of it:banana2:)are great for slipping into tight spaces in traffic....Stab & slip is what I call it:beer:

[DOOM]

He proceeded to tell me that 2700-2800 was all that was needed for a "Roots" blower.......3000+ is a waste of torque.... On a centri blower tho his opinion is just the opposite.

:agree: :beer:

[justbob]

Dave, although I can't feel it, even in 85* weather my 3:55's leave two 20' black stripes every time I hit it anywhere from 30-39 MPH! Feels to have hooked and gone, but when I check the mirrors I can see a faint set of stripes EVERY time. Thats what i'd call about a perfect match, no loss of control, feeling of sticking like glue, and go go go....like a speeding bullet.

[Sheepy]

4:10 and 3500 stall FTW!

[burt ragio]

Stick with the 4.10's. We have 3.55's in our 01' and the wife and I hate them in that car. It had 4.30's but I swapped IRS's.

Is the IRS the independent rear end ? If so how different does it handle from stock ?

[ImpalaSlayer]

Dave, although I can't feel it, even in 85* weather my 3:55's leave two 20' black stripes every time I hit it anywhere from 30-39 MPH! Feels to have hooked and gone, but when I check the mirrors I can see a faint set of stripes EVERY time. Thats what i'd call about a perfect match, no loss of control, feeling of sticking like glue, and go go go....like a speeding bullet.

im leaning more towards the 3.55s, i figure when i get my 31 splines put in i may aw well throw the stockers back in. the more i mod it the more i like driving it so the added gas millage will also be a plus

[illwood]

Is the IRS the independent rear end ? If so how different does it handle from stock ?
Yes, the IRS is an independent rear end, but he was referring to his 2001 Cobra, not the Marauder, FYI.

The IRS was stock in 1999, 2001, and the 2003-2004 SVT Cobras. They handle far better than a solid axle, however, for high power use, it is cheaper to build up a strong solid axle vs. the IRS.

[sailsmen]

Look at the Time SLip 4:10 are quicker in the 1/4.

Cent vs Eaton 60' show no difference a person can detect. For several years a Cent had the record low 60'. What you see on a Dyno graph and the real world are not the same.

You can look at the milliseconds on the dyno data but you can't tell it in the real world.

I have owned Eaton, Turbo, Cent, Big Block N/A, little block high rev N/A. Only thing I have not run is nitrous and a turbine.

[ctrlraven]

You just need to widen your rear tires. CheeseheadBob's old car felt fine to drive and it was 460rwhp/460tq with 4.10s on 295 series tires. Have to remember to increase your footprint when increasing power also.

[ImpalaSlayer]

Wider tires arnt going to do anyrthing with over 500 horse. I'm looking to make it better all around, my car isn't a race car

[ctrlraven]

I wonder how all those 600+ hp Cobras and Vettes do it every day..... lol

Wider tires and put your stock converter back in cause if you put 3.55 gears then you're going to want the stock converter back in anyways. Though you have to remember how much power will be going through the stock trans. Muscle Car Garage in Joppa, MD can rebuild it, contact CheeseheadBob for details on it since they did his and he was happy with the work.

[Seneca]

I wonder how all those 600+ hp Cobras and Vettes do it every day..... lol

Wider tires and put your stock converter back in cause if you put 3.55 gears then you're going to want the stock converter back in anyways. Though you have to remember how much power will be going through the stock trans. Muscle Car Garage in Joppa, MD can rebuild it, contact CheeseheadBob for details on it since they did his and he was happy with the work.
I think they are out of business. I've been by there a bunch of times the grass isnt cut and there are no cars around.

[sailsmen]

It makes no sense to increase the HP and then slow the car down by changing gears/tc.

I have a street tune ~476RWHP and any thing under 30mph lites up the tires.

I suggest you get a street tune and street tires. Get a race tune and race tires.

I drive 25K per year and make 40 passes. I understand the second gen drag DOT radial hook at the track. The first gen drag DOT performed poorly at the track and on the street.

This fall for race I will switch from MT Street ET to MT Street radial II. She will be more stable at the top end than the MT Street ET, which require a big dose of courage and luck to stay off the wall.

If you don't drive 25K per year or have a garage queen then you only need the MT Street radial II and be careful in the rain and corners.

Or get your 500RWHP and then do things to make it slower!:confused:

[ImpalaSlayer]

It makes no sense to increase the HP and then slow the car down by changing gears/tc.

I have a street tune ~476RWHP and any thing under 30mph lites up the tires.

I suggest you get a street tune and street tires. Get a race tune and race tires.

I drive 25K per year and make 40 passes. I understand the second gen drag DOT radial hook at the track. The first gen drag DOT performed poorly at the track and on the street.

This fall for race I will switch from MT Street ET to MT Street radial II. She will be more stable at the top end than the MT Street ET, which require a big dose of courage and luck to stay off the wall.

If you don't drive 25K per year or have a garage queen then you only need the MT Street radial II and be careful in the rain and corners.

Or get your 500RWHP and then do things to make it slower!:confused:

like i said before, my car dosent live at the track, im looking for better highway manners then anything. nothing set instone, but i figured when i go to put my 31s in that is when ill have to decide

[lastdaze04]

That is what I have and for now it is adaquate. However,,,,,,,,,,,,,,,,,,,,, like all other power junkies I will soon tire and want more:D.
Rick




hmmm seems like most keep them in. maybe ill compromise and run 3.73s

[bawazir]

i am happy with my 3:55, especially on the highway car keeping on going and going

http://smilies.sofrayt.com/1/950/ole.gifhttp://smilies.sofrayt.com/1/u/cop.gif

[jflave]

That is what I have and for now it is adaquate. However,,,,,,,,,,,,,,,,,,,,, like all other power junkies I will soon tire and want more:D.
Rick
So thats what's going on with me, Thanks. :)

[hotford]

I have 4:10 and a trilogy with the stock convertor and the rear widened with 305/45 18 M/T drag radials and I can tell ya the car hooks hard on the street, love the set up but always wanting more....lol This is why I just ordered KooKs LTH and a High Flow Catted X pipe through Lidio,Also need to go to 60 Lbs injectors I think this should be it for the MM for now, But then again this is what I said before with just the trilogy on it.

[vkirkend]

Dave, i would recommend the 3.55's. Even with the gear reduction you should still have a 12 second street machine that will get 20+ miles on the highway and still beat the majority of Hemi's etc..... on the street. At Marauderville V I rode in a Marauder that ran 12's and had 3.25 gearing and it was a BEAST!!!!

[ctrlraven]

They didn't make a 3.25 rear ring gear. Did you mean 3.27?

[Joe Walsh]

Dave, i would recommend the 3.55's. Even with the gear reduction you should still have a 12 second street machine that will get 20+ miles on the highway and still beat the majority of Hemi's etc..... on the street. At Marauderville V I rode in a Marauder that ran 12's and had 3.25 gearing and it was a BEAST!!!!


They didn't make a 3.25 rear ring gear. Did you mean 3.27?

3.27s are an 8.8" gear....sounds like Tom Doan's Cobra conversion.
I've had the chance (Thanks Tom!) to drive it and that car is a beast!

[vkirkend]

3.27s are an 8.8" gear....sounds like Tom Doan's Cobra conversion.
I've had the chance (Thanks Tom!) to drive it and that car is a beast!


Thaaaaaaaaaaaaat's the one!!!!!

[SamF]

4.10, stock converter...perfect.