Owners of 08s with 3.55 Gears Report
- Thread starter Flash1034
- Start date
Gary Weeks
Viper Owner
Mark
I just said that it was at 6000 rpm I didn't say it wouldn't go faster
It gets a little blurry around 6500rpm for some reason? Does the new PCM move the shift light up? If so what rpm does it come on? It seams like the fuel shut off is at 6500 rpm but again it get's a little hard to see going that fast
mjorgensen Woodhouse
Enthusiast
mark, run reportcoming?
Well I can tell you that the 3.73 will go a indicated and verified 193 in 5th using the additional rpm SRT has given me with the PCM. Is that fast enough as it
needs to be given how quickly I got there? Well...yes and NO
I'm a little more than embarrassed to tell you that even though it would probably have pulled into 6th relatively well I will never be finding that out...since there is no place you could actually do this...again...
I was very fortunate that the helpful trio did not feel the need to do worse once they discovered who I was, where I worked and what I did... lol not even for not displaying the in transits... lucky... nope... BLESSED for sure...STUPID... definitely.
Had fun while it lasted though so please do not try this at home.
eucharistos
Enthusiast
Well I can tell you that the 3.73 will go a indicated and verified 193 in 5th using the additional rpm SRT has given me with the PCM. Is that fast enough as it
needs to be given how quickly I got there? Well...yes and NO
I'm a little more than embarrassed to tell you that even though it would probably have pulled into 6th relatively well I will never be finding that out...since there is no place you could actually do this...again...
I was very fortunate that the helpful trio did not feel the need to do worse once they discovered who I was, where I worked and what I did... lol not even for not displaying the in transits... lucky... nope... BLESSED for sure...STUPID... definitely.
Had fun while it lasted though so please do not try this at home.
torn btw shhhhhwwwweeeeeeet
& nniiiiiiiiiccee thanks
absolutely agree, better to be blessed than lucky
Gary Weeks
Viper Owner
Well I can tell you that the 3.73 will go a indicated and verified 193 in 5th using the additional rpm SRT has given me with the PCM. Is that fast enough as it
needs to be given how quickly I got there? Well...yes and NO
I'm a little more than embarrassed to tell you that even though it would probably have pulled into 6th relatively well I will never be finding that out...since there is no place you could actually do this...again...
I was very fortunate that the helpful trio did not feel the need to do worse once they discovered who I was, where I worked and what I did... lol not even for not displaying the in transits... lucky... nope... BLESSED for sure...STUPID... definitely.
Had fun while it lasted though so please do not try this at home.
That would have to be very near 6500 rpm! I wonder how much that would have cost?
DPViper
Viper Owner
Wow...be safe. I hope you had both hands on the wheel and weren't fiddling with the radio!
Richie7
Viper Owner
Thanks everybody, this thread was very informative. I am planning on doing this mod in the springtime. I think I will go with the 3.55 based on everything I read and conversations I had with Chuck Tator.
Flash1034
Enthusiast
Cool. Thanks!
Flash
Flash
ZO6KLR
Viper Owner
I've got 20's in the rear and I was wondering if getting the 3:73's would be like comparing the 3:55's to the OEM 19". I can definitely feel a slower response with the 20's and I know that I need to do a gear swap. I was thinking originally about going with a 3:55 but now I am thinking more along the lines of the 3:73. Seems like if I do a 3:55 with the 20's, it will feel more like stock. Does that make any sense?
SilveRT8
Enthusiast
Simple Math : Your new 20"tires being 28" high vs the stockers 27"high, your rear axle ratio is reduced to 96.4% of the gear used. (27 divided by 28)
Your stock 3.07 rear now acts like a 2.96 gear.
3.33 would = 3.21
3.55 would = 3.42
3.73 would = 3.60
Claude
Quick run down with 3.55 gears in an 08. Just remember I was writing and driving so the is a margin of error! This was actual speed at 6000 rpm!
1st 50 mph
2nd 75 mph
3rd 105 mph
4th 137 mph
5th 185 mph
6th Not enough road but if it had the power 270 mph
Well I can tell you that the 3.73 will go a indicated and verified 193 in 5th using the additional rpm SRT has given me with the PCM. Is that fast enough as it
needs to be given how quickly I got there? Well...yes and NO
I'm a little more than embarrassed to tell you that even though it would probably have pulled into 6th relatively well I will never be finding that out...since there is no place you could actually do this...again...
I was very fortunate that the helpful trio did not feel the need to do worse once they discovered who I was, where I worked and what I did... lol not even for not displaying the in transits... lucky... nope... BLESSED for sure...STUPID... definitely.
Had fun while it lasted though so please do not try this at home.
How did Gary only get 185 and Mark hit 193? I really am more concerned with top speed in 4th gear, real world not calculator. I would like to see 132 to 134 with the 373. Can you test one more time Mark? If you get caught tell them your weren't doing IT again, it was just a 4th gear roll on this time.
Flash1034
Enthusiast
3.55s go in my 08 on Monday at Unitrax. I'll let you know what I think!
Flash
Flash
dragon rider
Enthusiast
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Thanks for the breakdown SilveRT8. I'm looking at a 19/20 inch setup. Those #'s help.
CitySnake
Enthusiast
Has anyone done (or know of anyone) 3.33 gears on an '08/'09. Yes, I know that this would yield a modest result and may not be a particularly good bang for the buck, but I'd just like to know if anyone can post a firsthand review. I've been told that someone in Illinois has done this. Don't know if he/she's a member or participates in this forum.
I hate these threads. They always cost me money!
I hate these threads. They always cost me money!
Flash1034
Enthusiast
I put 3.33s on my 06 and honestly couldnt tell the difference. I told myself I wouldt make that mistake again and am going to go with the 3.55s on my 08.
CitySnake
Enthusiast
Thanks Flash. It's a 7.5% change from stock to the 3.33's. I'm not sure of how your experience with an '06 would change with an '08 (if much at all). I think it might be a bit more apparent especially in the lower range where the car would be a bit "quicker" since the '06 may be a bit snappier in the lower ranges. Hard to judge.
SilveRT8
Enthusiast
Flash1034
Enthusiast
I didnt get it done due to the rainy/hailing weather. Still pending...
Flash
Flash
eucharistos
Enthusiast
happen to know from a song that it never rains in southern california 
waiting on your report
Richie7
Viper Owner
Any new feedback from people who have done a gear swap in an '08-'09?
New Feedback?
It is STILL the # 1 bang-4-buck performance mod you can consider....a "Poor Man's Supercharger"
But if you choose a 3:73 (vs 3:55) on a G4, you BETTER have it pointed where you wanna go, it is very easy to swing the rear out if you mash the loud pedal......
I posted this about 3 weeks ago and I am still very happy with the choices. I absolutely recommend 3.55 for the street. I think the shifter change is underrated. With the lower gears you naturally shift more and it makes it so much nicer.
Drove my 08 coupe with 800 miles on it 400 miles to Woodhouse. 22.5 MPG on the way down mostly cruising at 80 MPH in 6th (1500 RPM).
Had Belanger headers and cats, Corsa exhaust, 3.55 gears, MGW shifter, MGW knob and Mopar PCM installed.
On the way home got 20.5 MPG but was playing with car more and running more in 5th.
3.55 gears were an excellent recommendation for my driving style and area where I live.
MGW shifter and knob was well worth the money. Shifts are much easier and nicer. Your hand when resting on shifter is at the perfect height to work radio and the feel of the shifter is great.
When the car starts it just barks. Love the sound. Could see where some people might not like it. You can make the car sound like a Japanese water cooled V twin or a 102 CI straight pipe Harley depending on RPM and gas pedal.
The PCM seems to make the car sound like it has a cam in it. The idle, which might still be adjusting definitely has a different feel.
Want to thank Aaron and Fred for the great work on the car. I delivered the car on Thursday at 0800 and left at 1030 Friday.
Mark had my take off parts shipped out by 1200 that day and where at my home Monday.
All in all I am very Happy with the changes.
Thanks Aaron, Fred and Mark
Drove my 08 coupe with 800 miles on it 400 miles to Woodhouse. 22.5 MPG on the way down mostly cruising at 80 MPH in 6th (1500 RPM).
Had Belanger headers and cats, Corsa exhaust, 3.55 gears, MGW shifter, MGW knob and Mopar PCM installed.
On the way home got 20.5 MPG but was playing with car more and running more in 5th.
3.55 gears were an excellent recommendation for my driving style and area where I live.
MGW shifter and knob was well worth the money. Shifts are much easier and nicer. Your hand when resting on shifter is at the perfect height to work radio and the feel of the shifter is great.
When the car starts it just barks. Love the sound. Could see where some people might not like it. You can make the car sound like a Japanese water cooled V twin or a 102 CI straight pipe Harley depending on RPM and gas pedal.
The PCM seems to make the car sound like it has a cam in it. The idle, which might still be adjusting definitely has a different feel.
Want to thank Aaron and Fred for the great work on the car. I delivered the car on Thursday at 0800 and left at 1030 Friday.
Mark had my take off parts shipped out by 1200 that day and where at my home Monday.
All in all I am very Happy with the changes.
Thanks Aaron, Fred and Mark
Malu59RT
Enthusiast
Everyone still loving the 3.55's? My birthday is coming up and I think I need to treat myself with something nice since the car will be out of warranty soon
There are some notes here from track guys and the question of whether the cars that do alot of road courses should go to 3.55s. For years I would have said leave the 3.07s alone if you primarily do road course use, but that , I feel , changed with the Gen IVs. With a PCM and 3.55 gears the cars pulls farther through the gears than you would expect, and has tons of grunt out of tight corners.
Ted Hughes, who is also racing in the ACR-X cup, was more than gracious in letting me drive his 08 Viper Violet ACR for what ended up being an entire morning session ( I did say he was gracious, I said nothing about me not being a complete unabashed track ***** ). This absolutely blew me away from previously running alot of Gen IIs , as the extra rpm allowable seemed to be matched perfectly to the 3.55s. We also had installed headers on this car and it ruined me for life ( three weeks later there was an ACR in my garage ).
I will be the first to admit that I am completely wrong about the gears for the Gen IVs, especially, as I still suggest folks stay with 3.07s in the old cars to keep shifting at a minimum. The extra rpms and the power up top on the VVT 8.4 means the gears work and the power band is sweet -- not alot of shifting necessary. I would not recommend the 3.73s for road course use, but for the street and the strip , that may be the way to go --- big rush riding in Mark's wicked wagon.
Lastly , for those folks that run really fast tracks like Willow Springs or Road America , the 3.33 might be better , or possibly even stock, but I have a feeling the 3.55 is the best overall gear change , as it is great for most of the newer tracks that limit speeds to maybe 130-145 tops , even in a Viper.
Gotta get gears for my ride ............actually gotta get alot of things , damn addictive machines!
Ted Hughes, who is also racing in the ACR-X cup, was more than gracious in letting me drive his 08 Viper Violet ACR for what ended up being an entire morning session ( I did say he was gracious, I said nothing about me not being a complete unabashed track ***** ). This absolutely blew me away from previously running alot of Gen IIs , as the extra rpm allowable seemed to be matched perfectly to the 3.55s. We also had installed headers on this car and it ruined me for life ( three weeks later there was an ACR in my garage ).
I will be the first to admit that I am completely wrong about the gears for the Gen IVs, especially, as I still suggest folks stay with 3.07s in the old cars to keep shifting at a minimum. The extra rpms and the power up top on the VVT 8.4 means the gears work and the power band is sweet -- not alot of shifting necessary. I would not recommend the 3.73s for road course use, but for the street and the strip , that may be the way to go --- big rush riding in Mark's wicked wagon.
Lastly , for those folks that run really fast tracks like Willow Springs or Road America , the 3.33 might be better , or possibly even stock, but I have a feeling the 3.55 is the best overall gear change , as it is great for most of the newer tracks that limit speeds to maybe 130-145 tops , even in a Viper.
Gotta get gears for my ride ............actually gotta get alot of things , damn addictive machines!
3:55 up to 650 HP.
the '10 5th gear ratio will make it sweeter still
as BP found in the ACRx
the '10 5th gear ratio will make it sweeter still
as BP found in the ACRx
You see I have experianced exactly the same thing..
My 2003 srt10 had intake/.roller rockers for 459 rwhp.
My buddy had a 2002 GTS ACR that had intake/exhaust/roller rockers/headers at 450 rwhp
the cars were both around the same weight (33xx pounds)
The 9 rwhp advatage I had (same dyno)was off set by his 1 inch smaller rear tires..
esentially these two cars were quite even in power/weight/performance..My 2003 srt10 had the stock 3.07 rear end and his 2002 GTS ACR had the 3.55 gears.
We raced many times one night. maybe 7 races and it was the same every time..
We would both start at 50 mph and his car would jump out a car length..then he would switch gears much earlier than i had to and I would gain a car length on him and this cycle would continue with us both passing each other..Depending on were the race stopped would show who won.
I just dont belieave that in Vipers the gear changeing really makes them any faster. These cars come with 500 Torque in stock form.
An S2000 or nsx or supra would really benifit from lower gears. The no power till boost or no power till vtec really is helped by low end grunt of steep gears.
The Viper spins llike crazy on the stock 13 inch wide rears with stock 3.07 gearing
Malu59RT
Enthusiast
TrackAire
Enthusiast
Twister,
You can't compare a Gen II or III's "usable" torque curve with a Gen IV. Imagine putting a 3.23 gear in your NSX....not going to work well. The Gen IV's are much more like a European engine..kind of weak down low but like hitting a nitrous button above 5000 rpm.
Right now I'm guessing a Gen IV with 3.55's, Mopar controller and headers will be able to walk away from a Ferrari 599 or even a tuned ZR1. If it has a 5th gear mod, then I'd bet it would beat both of those cars to 200 mph.
I'm thinking with all the runs you've done on non race prepared street surfaces, your tires are glazed and hard as a rock. Time to get yourself some drag radials and show the natives who the real king of the island is
Cheers,
George
