I did some searching on the forum but I did not see anything about this. Is it possible to get a taller 5th gear for our trans? Would be nice to not be turning 3k on the highway all the time.

Can you get a taller 5th or is it just the final drive that will need to be upgraded front and rear?

Asked an expert a while back, he said not very likely.

BTW, imagine what a 4.11 gear will have you turning on the highway, if you don't like the 3000 at 70 you have now. I think we've got plenty of torque to get out of the hole (or sufficiently overpower awd traction) without sacrificing the top end speed and running flat at the end.

a 3.56 or 3.23 would be nice. you would think that it would be easy just to change the 5th gear in the trans, unless it is a size issue.

good lord, just noticed your mod list. WOW

I just sold a Twin Turbo viper to a guy in Hammond, MS

Hammond, LA?

There are some nice Vipers creeping around here. :pinklove:

I think the fit was the issue and I am guessing there is a bunch of other stuff to consider, teeth fit, size of step from previous gear, what HAL has to say about it.

Hammond, LA?

There are some nice Vipers creeping around here. :pinklove:

I think the fit was the issue and I am guessing there is a bunch of other stuff to consider, teeth fit, size of step from previous gear, what HAL has to say about it.

A taller 5th would have been nice... I was just thinking about that.

Noticed this weekend on a road trip about a 3mpg difference between cruising at 75 vs 85. Over a tankful thats an extra 60 miles...

And I suppose at only 5 over I don't need to be quite so attuned to the radar detector. :cool:

NITTO makes a NT 420S tire 275/55R20 THAT IS 31.97 tall and 11.02 wide. If this will fit on the rear & front it would raise the rear ratio FROM 3.73 to 3.40 and in 4th gear it be tacking 2700 rpm.

I'm no expert, but if you ran those rear tires wouldn't you have to also switch your front tires to a matching size to not ruin your AWD system? On every AWD system I've ever seen you have to maintain a ratio of tires size between the fronts and rears.

I'm no expert, but if you ran those rear tires wouldn't you have to also switch your front tires to a matching size to not ruin your AWD system? On every AWD system I've ever seen you have to maintain a ratio of tires size between the fronts and rears.

YES I 4 GOT TO LIST THE FRONT. YOU NEED THE SAME SIZE FRONT N REAR.

srt has said that the difference between front and rear wheel diameters can't exceed 5%

3:42 would be a good choice. perfromance and economy.

3:42 would be a good choice. perfromance and economy.
3:42?
I'm with Sarge 4:11.....
Bill

man up, 4:88

3:42 would be a good choice. perfromance and economy.

The best overall street strip gear is a 3.90/3.91/3.92 but i still think the 4.10 is a better choice. I had 3.23 and 4.10 on my 68 road runner and it was easier for the wife to drive with the 4.10 with a 4 speed. The gas mileage stayed the same in town and as long as you didnt go over 65 on freeway it was also the same as the 3.23.

man up, 4:88

If your going to man up then go with 5.13 and that way you can run 1/8 and 1/4 lol. There a guy that runs NHRA IN U/SA CLASS WITH A 65 DODGE STATION WAGON WITH A 273 2 BARREL MOTOR AND RUNS 5.56 GEARS. He was the record holder for many yrs.

3:42?
I'm with Sarge 4:11.....
Bill

you're with him? you are selling them, no? :indifferent:

4.11 is a waste imo, and for daily driver it is a loser - even busier engine at hwy driving. 3000 rpm at 80 will go to 3500 at 80. :( We already have a 3.73 awd launches. Don't want to sacrifice hwy driving characteristics to take off like a 73 nova that peters out at 1/8 mile. I guess it would be fun to see the bucking start it could produce, assuming you could get traction, but there is no denying that it hurts top end characteristics and hwy driving. Pure track car, maybe fun to try, but 99% are drivers that hit the track.

Hell, if you're going there, do the 5.16, I agree with below, make it an 1/8 miler. :) Moves out then peters out:D

One thing that people are missing as far as the launches go... Comparing it to a older car running the same 4.11 gears the first gear ratio of the NAG is 3.59 the old 727 trans in the old car is 2.54. The total first gear ratio of the NAG with 4.11 gears is 14.75:1. Tha makes for a stellar launch. The old car only has a total first gear ratio of 10.44:1. To make that first gear comparable you need to have 5.81 gears. What I am getting at is that deeper gears are really not needed unless you plan on some heavy mods.

I would imagine the jeep would launch just as well as stock with a converter and some 3.42 gears with saving some of the RPM on the highway. For me it is not a issue as I hardly drive on the highway.

One thing that people are missing as far as the launches go... Comparing it to a older car running the same 4.11 gears the first gear ratio of the NAG is 3.59 the old 727 trans in the old car is 2.54. The total first gear ratio of the NAG with 4.11 gears is 14.75:1. Tha makes for a stellar launch. The old car only has a total first gear ratio of 10.44:1. To make that first gear comparable you need to have 5.81 gears. What I am getting at is that deeper gears are really not needed unless you plan on some heavy mods.

I would imagine the jeep would launch just as well as stock with a converter and some 3.42 gears with saving some of the RPM on the highway. For me it is not a issue as I hardly drive on the highway.

Yeah, I think the 342 would be a good comprimise with running the track and hwy. would be a better roll racer.. lol

Has anyone even changed the gear ratio in the jeep, regardless of which direction or for which reason (performance or economy)? Im pretty sure no one has done it for economy or we definitely would have heard about it.

Has anyone even changed the gear ratio in the jeep, regardless of which direction or for which reason (performance or economy)? Im pretty sure no one has done it for economy or we definitely would have heard about it.

don't think its been done. As for getting the computer to like it, I think you've got to trick the thing using the tire size ratio adjustment:eek:. No doubt a launch will be strong with such a change, but you don't get that gain without giving it up at the end of the track, and an even more busy engine even at modest 60-70 mph speeds.

you're with him? you are selling them, no? :indifferent:

4.11 is a waste imo, and for daily driver it is a loser - even busier engine at hwy driving. 3000 rpm at 70 will go to 3500 at 70. :( We already have a 3.73 awd launches. Don't want to sacrifice hwy driving characteristics to take off like a 73 nova that peters out at 1/8 mile. I guess it would be fun to see the bucking start it could produce, assuming you could get traction, but there is no denying that it hurts top end characteristics and hwy driving. Pure track car, maybe fun to try, but 99% are drivers that hit the track.

Hell, if you're going there, do the 5.16, I agree with below, make it an 1/8 miler. :) Moves out then peters out:D

Oh now your a gearing expert? I guess you havent seen what a 426 300 ran when he went from 3.06 gears to 3.92. Just 11.4's to 10.95. Not a big difference at all. I hit 3k rpms at 80 mph I dont know what u are driving.

what was the mph? I bet it stayed the same. I could be wrong. I believe he was reffering to more aof a daily driver.

Oh now your a gearing expert? I guess you havent seen what a 426 300 ran when he went from 3.06 gears to 3.92. Just 11.4's to 10.95. Not a big difference at all. I hit 3k rpms at 80 mph I dont know what u are driving.

Different car different gearing, different weight, different everything else and that car had other things change between those runs, mr. expert. You're so busy shilling you're missing the point, which is that it hurts top end speed and cruising characteristics, which has always been my contention. Add to that that we're already at 3.73 and I think my point is made. Its about balance not too much of a good thing for another car starting at vastly different gearing.

3000k at 80 ok whatever, its still very busy and not friendly for daily driving characteristics, Everyone knows that the taller gear can hurt you at the end of the track and at cruising speeds and will reduce mph, which is what I wrote earlier. Add to that that most builds are already overpowering awd launch with higher stalls etc, and I believe that my opinion is a credible one.


Edited sua sponte.

Look the comparo offered is a car going from 3.06 to 3.92, you'd expect a gain there. More of such a thing is not always better, or we'd all run 5.16s. Oh wait, someone already said that. We're already at 3.73 and our cars have great take off and tend to lose at the back end of the track due to gearing and aerodynamics. There's a point at which diminished returns are there, and that for cost and time, and all the rides I've taken in 442s, Nova and every other older muscle street car with a bigger gear, they pull like mad and peter out in the end. Getting the thing to trap 125 and up is the way to concentrate on mitigating the weakness of our ride characteristics, not gearing it up. For a 3.06 car, yes, a great way to get some more out of it, but for an awd jeep that is at 3.73, its not nearly the same comparison. Someone will be running these soon anyway and when they prove me wrong you guys can enjoy the vindication, etc. Strip some weight and pack on a real power adder, seem so much more simple that opening both diffs and then tricking the tire ratio setting to accept the new gearing.

Different car different gearing, different weight, different everything else and that car had other things change between those runs, mr. expert. You're so busy shilling for you know who you're missing the point, which is that it hurts top end speed and cruising characteristics, which has always been my contention. Add to that that we're already at 3.73 and I think my point is made.

3000k at 80 ok whatever, its still very busy and not friendly for daily driving characteristics, but since Junior is the unofficall cheerleader of the month blasting the hemi community sites with his "objective testimonials", he makes it personal by calling me an expert rather than debating the fact that everyone knows that the taller gear can hurt you at the end of the track and at cruising speeds and will reduce mph, which is what I wrote earlier. Add to that that most builds are already overpowering awd launch with higher stalls etc, and I believe that my opinion is a credible one.

What color are your pom poms for Christmas?

I responded to your pms on another site because I guess you can only send insulting pms but not receive them.

http://i8.photobucket.com/albums/a10/Rambit/Stop.jpg
After receiving several complaints, the personal stuff needs to end right here and right now. Debate all you want on the topic of this thread, but the other stuff ends.

Bernie

I did a little research on the NAG transmission and came up empty handed for the larger overdrive. About the only option I see is change the gears which is pretty expencive. I don't think the larger tires would look right on the SRT IHMO.

well that does suck. The easiet of course would be to put a higher 5th gear in the trans. However from what I can tell there is not enough room/teeth situation there to do this. If so this would be a great mod for BIll on his trans' he sells.

stock 3.73 with stock gearing and a taller 5th for everything else would be great. I did this on my Diesel jetta (taller 5th) and brought the rpm down from 3100 at 80mph to 2600. Got much better fuel (about 5+ mpgs) per gallon and it was not revving the snot out of a car that redlined at 4000rpm anyway.

how bout a 6sp trans, keep the stock gearing and be done with it...lol

how bout a 6sp trans, keep the stock gearing and be done with it...lol

+11111111111, overdrive FTMFW!

Probably a dumb question, but is there a tune that can mimic a gear ratio change, thus lowering the RPMs? I thought the Diablo had some type of gear tune?

Probably a dumb question, but is there a tune that can mimic a gear ratio change, thus lowering the RPMs? I thought the Diablo had some type of gear tune?

Theres only 2 ways to lower the rpm without driving slower.
1-taller tires if they will fit
2-change to a higher overdrive gear in the trans or higher rearends gears and this will be big buxs.