3.55 Gears Gen2 - Advice

[Gavm360]

Can someone point me in the best direction to purchase these. And any tips for install, additional parts etc.

Specifically the speedo calibrate etc.?

Seems like my local viper tech should be able to install

2001 GTS

I've always wanted these and now that I have a challenger hellcat the viper needs a little more shove.

Any feedback appreciated.
Thanks
Gavin

[drewsss]

This is one of the best mods you can do - you will really see a kick! Good luck!

[BlknBlu]

Jon B at Partsrack

Bruce

[99RT10]

I might have a set ready to bolt in. PM me.

[SARaptor]

interested to read what others respond here. i recently did the 3.55s in my G2, they are a worthwhile mod (BUY THEM!). my only issue/concern is how off my speedo is. I purchased all my parts from JonB including the recalibrator (not sure of official name), but my speed is still 6mph off at 70mph. I am sure the fact that i run a 345/30/19 or 355/30/19 depending on which wheels are on the car doesnt help, i would like to know what others are doing to correct the speed.

[2001gts]

look up yellr box

http://www.yellr.com/yb_home.htm

thats what most of us use or sct tuner

I have 3.73's with some mods, I like it quite a bit. I'd rather have the 3.55's over the 4.10's but prefer the 3.73/;s

[tagoo]

I do not believe the SCT tuner can be used to change the speedo calibration. The Yellow Box solution is great. It is cheap (I think I paid less than $150) and it is highly adjustable by changing the dip switch settings. If you work with it, you can get it dead accurate. It may take a few times of trial and error changing the settings and checking with a GPS but it isn't that hard. It is really nice because if you decide to get taller or short tires, you can re-adjust the speedo for that new size of tires. It is not too hard to install, but you do need to splice into a couple of wires near the ECU, but when you are done everything is hidden behind the ECU cover plate.

[MalingatorGTS]

Like others said, best money for fun mod you can do! Call JonB and there is a full article on the PartsRack website all about gears!

Don't bother with a Viper tech! Find a good Jeep 4x4 guy and call them. It's a Dana rear, most solid Jeep builders can do them with their eyes closed!

For the speedo, for the Gen2, you can't do it with a tuner. JonB has a tap in calibration box that is simple to wire in and adjust for the 3.55s.

Check out the PartsRack.com website! Best $ mod for seat of pants fun!

[Gavm360]

Appreciate the feedback guys. Sounds like I just need to do it.

[SARaptor]

look up yellr box

http://www.yellr.com/yb_home.htm

thats what most of us use or sct tuner

I have 3.73's with some mods, I like it quite a bit. I'd rather have the 3.55's over the 4.10's but prefer the 3.73/;s

Thank for the info, I will order ASAP.

[Vprbite]

As malingator said, a good 4x4 shop should be able to do them no problem. A GOOD viper tech can. The stories I have heard about some of the Viper techs would worry me though, because you can screw up gears. Also, when you pirchase them, Jon should be able to give you break-in instructions. Proper break-in (as well as good install) should keep you from getting whine. They will need serviced a little more often, but not much, depending on driving, I would think every few years is fine unless you are tracking. Then, more often of course but you know that if you track.

FWIW, I think 3.55s are the way to go. I believe (obviously people have differing opinions) 3.73 is too much and you will be rowing through gears like it's your job. I think 3.55 is just the perfect sweet spot for getting a bunch more oomph without getting unruly or having to shift too much. I had them on my 02 and loved them.

SARaptor, if you did the speedo box, is it the tires throwing off the speed? That's a lot to be off by though. For example, my truck is off by 10% because of the tires but they are huge compared to stock. The difference in the tires you are running isn't that much. Is there any chance you did someone wrong on the install of that box? Worth a double check because i wouldn't think those tires would throw it off by 9%. Remember though, speedometers are allowed to be off by 5mph from the factory. Perhaps yours was off a bit to start? Let us know how it works out for you because others may have that problem.

[Geronimo]

look up yellr box

http://www.yellr.com/yb_home.htm

thats what most of us use or sct tuner

I have 3.73's with some mods, I like it quite a bit. I'd rather have the 3.55's over the 4.10's but prefer the 3.73/;s

Same here.

[dave6666]

+1 on 3.73's, depending on tire size. My net is 3.43 with tires.

Ref "viper techs" I bet very few have ever seen a G1/2 car. Let alone they are oil change boys for the most part. Not chassis and powertrain experienced mechanics. So yes, pull the diff yourself and take it to a gear shop.

Also, very important to follow the break-in procedure. When Unitrax did mine it was (2) 20 minute mild drives with complete cool downs between them. And them 500 miles total of no WOT driving. All of which is counter intuitive to a performance go-fast mod. But it will make a huge difference in the life and noise level of your gears.

Finally, doing gears is a good time to install a better diff. Pricey, but while you are in there...

[Gavm360]

I'd rather avoid the dealer anyways so I'll try the gear / jeep shop route. Have a place I took my lifted truck I can try.

[SARaptor]

SARaptor, if you did the speedo box, is it the tires throwing off the speed? That's a lot to be off by though. For example, my truck is off by 10% because of the tires but they are huge compared to stock. The difference in the tires you are running isn't that much. Is there any chance you did someone wrong on the install of that box? Worth a double check because i wouldn't think those tires would throw it off by 9%. Remember though, speedometers are allowed to be off by 5mph from the factory. Perhaps yours was off a bit to start? Let us know how it works out for you because others may have that problem.

I agree, it is a lot to be off. I will say it has always been off a bit even before the gears, now it just seems to be off a little more. I would be ok if the miles and speedo were reading slow haha. Regarding the truck comment, i too put bigger tires on my truck (from 32.7 to 35) and the speedo is only off 3mph at 70...and reading slow, so i am good with it lol! i will try this yellr box and see how it works out.

[Vprbite]

I agree, it is a lot to be off. I will say it has always been off a bit even before the gears, now it just seems to be off a little more. I would be ok if the miles and speedo were reading slow haha. Regarding the truck comment, i too put bigger tires on my truck (from 32.7 to 35) and the speedo is only off 3mph at 70...and reading slow, so i am good with it lol! i will try this yellr box and see how it works out.

Yeah, mine reads 10% low. So I adjust when driving. But if you are reading high then obviously that would be turning your odometer a bit faster.

Double check the install on the box and make sure it's correct. Because the overall difference in those tires shouldn't be a ton. Also, I would send Jon B an email and ask him if he has seen this before. FWIW, it seems like my my speedo is off a smidge in my Gen III as well, and I am running stock wheels and of course newer tires but they can't be that different than the stock run flats. I think also, our speedos (Gen II and my Gen III) are a little tough to read "dead on balls accurate" cause the needle is kinda thick and the notches between the numbers kinda small. So that could account for 1 or 2 mph.

Best of luck. I think gears are an awesome mod. I hope you get this little gremlin figured out. I haven't heard of this being a problem before.

[My98RT10]

By the way, Dan Cragin confirmed here in another thread, that speedo can be corrected with a tune for Gen 2 Viper. No need for a whatever colored box ;-)

[Vprbite]

Well dan would know. I think he worked on a Viper once or twice.

[challenger]

3.73 with 19's in the back is perfect. And Yellr box works great and records your top MPH

[Gavm360]

thanks to all your feedback I contacted JonB today and have 3.55 gears on its way

If anyone has any Columbus Ohio advice on installers etc. please send my way

Gavin

[ultradriver10000]

I love my 3:73, a taller DR or 19" wheel makes it perfect.

[99RT10]

If you want one ready to bolt in, PM me.

http://driveviper.com/classifieds/en...-clutches.html

[ViperRyan]

thanks to all your feedback I contacted JonB today and have 3.55 gears on its way

If anyone has any Columbus Ohio advice on installers etc. please send my way

Gavin

I've been going back and forth on this as well. Trying to decide between 3.55 or 3.73 for my GenII with GenV sidewinderII wheels. I spoke with Dan Cragin about this and he said 3.55's were the better route, and also spoke with the shop who will be working on my Viper, Collectors Choice/Snake-Oyl Producst owner Cory Gehling, he also recommended the 3.55 over the 3.73.

I put 3.73 in the back of my TA and love it, but I know the Viper is a different animal. I will probably go with the 3.55, but still having an internal debate on the subject lol.

[Boosted Motorsports]

I've been going back and forth on this as well. Trying to decide between 3.55 or 3.73 for my GenII with GenV sidewinderII wheels. I spoke with Dan Cragin about this and he said 3.55's were the better route, and also spoke with the shop who will be working on my Viper, Collectors Choice/Snake-Oyl Producst owner Cory Gehling, he also recommended the 3.55 over the 3.73.

I put 3.73 in the back of my TA and love it, but I know the Viper is a different animal. I will probably go with the 3.55, but still having an internal debate on the subject lol.

If you've had that type of gearing before then you kind of know what to expect. My advice would be if you are planning to go FI or keeping the original diameter wheels then stick to the 3.55. If you are going with the newer or larger diameter wheels and staying NA I would opt for the 3.73.

Final factor would be if you plan on going on long roadtrips with the car and care about gas mileage or highway cruising RPM.

Just my 2 cents.

[ViperRyan]

If you've had that type of gearing before then you kind of know what to expect. My advice would be if you are planning to go FI or keeping the original diameter wheels then stick to the 3.55. If you are going with the newer or larger diameter wheels and staying NA I would opt for the 3.73.

Final factor would be if you plan on going on long roadtrips with the car and care about gas mileage or highway cruising RPM.

Just my 2 cents.

Thanks for the reply. Right now I do have 19" GenV Sidewinder2 wheels. I have the gearing(3.73) in my Trans Am(LS1), but the Viper is a totally different beast. I've thought about FI, but that's a long ways down, I would do a full head/cam package before doing FI on the car.

What's MPG lol, didn't by the car for it's mpg on the highway. I think both the 3.55/3.73 should have relatively close cruising hwy speeds/rpms in 6th, wouldn't they?