Gen 5 diff

[Arizona Vipers]

Does anyone have a good diff for sale? Prefer with the stubs and axles. Wanting to get solid mounts made for it and can't have my car down for that long. Plus a spare is a good idea lol.
Thanks!

[PkB2014]

Does anyone have a good diff for sale? Prefer with the stubs and axles. Wanting to get solid mounts made for it and can't have my car down for that long. Plus a spare is a good idea lol.
Thanks!

ah, dang. Are these scarce now, too? They aren't available from dealers? That's not good since these things fail pretty regular, at least in my experience.

[Arizona Vipers]

ah, dang. Are these scarce now, too? They aren't available from dealers? That's not good since these things fail pretty regular, at least in my experience.

I haven't heard of any failing have you? On mine the half shaft popped out on track, this has happened to Calvo too. Solid mounts solve the problem.

[jrubin80]

I believe they are getting harder to source, at least new. Mine ACR was down for 5 weeks earlier this year after being approved for a warranty replacement. They told me there were only a half dozen in the country at the time.

[PkB2014]

I haven't heard of any failing have you? On mine the half shaft popped out on track, this has happened to Calvo too. Solid mounts solve the problem.

mine failed twice, rebuilt once because parts were scarce, replaced the second time. I think both times were maybe my fault, but warrantied anyway. Now I'm fine buying my own, but they need to be available at least. I guess the internals may be found and rebuilt at minimum.

[13COBRA]

Pretty scarce...

https://www.ebay.com/itm/303773257106?fits=Model%3AViper&hash=item46ba4c0d92:g:gSEAAOSwjGxftTNa

[Arizona Vipers]

Pretty scarce...

https://www.ebay.com/itm/303773257106?fits=Model%3AViper&hash=item46ba4c0d92:g:gSEAAOSwjGxftTNa

Thanks dude, I saw that one! I just hate buying "unknown" stuff ya know? But might have to

[PkB2014]

https://parts.chryslerjeepdodgecityofmckinney.com/p/Dodge__/DIFFERENTIAL-Rear-Axle-Thermal-Rear-Axle/69406100/53010743AH.html

This seemed to be available for in store pickup? I didn't call them to verify though.

[usmcfieldmp]

https://parts.chryslerjeepdodgecityofmckinney.com/p/Dodge__/DIFFERENTIAL-Rear-Axle-Thermal-Rear-Axle/69406100/53010743AH.html

This seemed to be available for in store pickup? I didn't call them to verify though.

McKinney is only a stone's throw away from me. They seem to only want $40 to ship to AZ though.

[TKO MOTORSPORTS TEAM]

Factory difs gets scarce you can always go quick change. Much more durable then factory dif, alot more gearing options , torque bias choices, quick change ability, and cost is not to bad. They do require some basic fabrication for install and slightly heavier then factory dif.

[Pappy]

Factory difs gets scarce you can always go quick change. Much more durable then factory dif, alot more gearing options , torque bias choices, quick change ability, and cost is not to bad. They do require some basic fabrication for install and slightly heavier then factory dif.

Cable, you might want to check with RTS (the guys that built your sequential). They have already adapted a Winters quick change to a C6 Corvette with the rear mounted transmission. https://www.facebook.com/1022867494532049/videos/992268174891045/

It would probably be easier for them to machine the mounts to put the Winters in a Viper - they have a guy who loves doing that CNC stuff.

[13COBRA]

Factory difs gets scarce you can always go quick change. Much more durable then factory dif, alot more gearing options , torque bias choices, quick change ability, and cost is not to bad. They do require some basic fabrication for install and slightly heavier then factory dif.

You lost Cable at "heavier"....haha

[TKO MOTORSPORTS TEAM]

You lost Cable at "heavier"....haha

Always take the trade endurance for a little weight. Learn from Alpha, Spice, Mercedes, Peugeot and Porsche bad engineering decisions in the past .. You cant win if you dont finish

[13COBRA]

Always take the trade endurance for a little weight. Learn from Alpha, Spice, Mercedes, Peugeot and Porsche bad engineering decisions in the past .. You cant win if you dont finish

Right, but Cable is a lightweight freak haha

He only has to run 3 laps at a time.

[swexlin]

It's a Dana 44 right? But I guess specific to each different application. My first one got "clunky" and whiney at high speed, was replaced under warranty about 5 years ago. This one has been fine.

[texasram]

Don't remind me about down time, mines been sittin out back of a shop for 2 months waiting on synchros for 2 gears......

[Arizona Vipers]

Factory difs gets scarce you can always go quick change. Much more durable then factory dif, alot more gearing options , torque bias choices, quick change ability, and cost is not to bad. They do require some basic fabrication for install and slightly heavier then factory dif.

I'm going to be trying a Drexler diff soon, so need to keep this case

[Arizona Vipers]

Cable, you might want to check with RTS (the guys that built your sequential). They have already adapted a Winters quick change to a C6 Corvette with the rear mounted transmission. https://www.facebook.com/1022867494532049/videos/992268174891045/

It would probably be easier for them to machine the mounts to put the Winters in a Viper - they have a guy who loves doing that CNC stuff.

We are gonna ask!

[PkB2014]

Good to hear there might be some options if/when this diff dies.

[stradman]

I've been running wavetrac for a couple of years. No problems at all.

[steve911]

Pretty scarce...

https://www.ebay.com/itm/303773257106?fits=Model%3AViper&hash=item46ba4c0d92:g:gSEAAOSwjGxftTNa

That is not a Gen V diff. unless they changed the rear cover. All Gen V diffs have the SRT logo on the back cover.

[usmcfieldmp]

That is not a Gen V diff. unless they changed the rear cover. All Gen V diffs have the SRT logo on the back cover.

Good eye. Looks like a Gen 3/4.

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[Steve M]

That is not a Gen V diff. unless they changed the rear cover. All Gen V diffs have the SRT logo on the back cover.

It could very well be a genuine Gen 5 differential.

1. It has the correct stubs
2. There have been reports of 2013 and 2014 cars with the "Fangs" differential covers: https://driveviper.com/forums/threads/9266-First-issue-with-my-2013-gts-Hard-to-select-reverse-thoughts?p=145029&viewfull=1#post145029

The only substantial difference would be the it would have 3.55s (Gen 5) instead of the 3.07s (Gen 4), which would be easy enough to check. Otherwise, everything else (minus the stubs) would be the same as what came in the Gen 4s. It could not be a Gen 3 unit because the stubs would not work with the Gen 3 Hydra Lok differential.

[LATAMUD]

I can confirm, I have a new Gen5 diff with the Gen5 stubs and came with the fangs rear cover.

[CNU_Physics]

Yeah my 2013 has the Fangs logo on the cover

[Lawineer]

Yeah my 2013 has the Fangs logo on the cover
Same. Freaked me out today until I looked it up.

[Steve M]

Same. Freaked me out today until I looked it up.

You should see if there's a Sneaky Pete logo stamped on your transmission tail shaft housing - if it's there, it'd be below the shifter on the passenger side.

[PkB2014]

wow, that's interesting about the different covers. I have the ACR extra cooling fins cover. I would recommend going with that one if anyone needs a replacement. If it can even be found anymore.

[SRT_BluByU]

My 2014 had fangs from the factory... MY 2017 had SRT logo from factory (FYI).

[Lawineer]

I bet it was something like using an old manufacturer and it specified to use put the logo on there, and they made it with the old logo they had on file or something.

[13COBRA]

The 2014 rear diff I purchased and put in my Gen IV ACR had the fangs.

[Old School]

The old "Dodge-Desoto-Chrysler-Plymouth" logo was cast into parts at least 10 years after the demise of Desoto

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[dsp300c]

Saw this on FB just now

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[SRT_BluByU]

I bet it was something like using an old manufacturer and it specified to use put the logo on there, and they made it with the old logo they had on file or something.

Probably just burning through surplus stock and when needed new production had the correct (for the time) SRT logo revision included.

[BSLSK]

2014 with fangs too on the diff. I thought all diffs had the fangs as an "easter egg". News to me that newer years have the SRT logo instead.

[Steve M]

2014 with fangs too on the diff. I thought all diffs had the fangs as an "easter egg". News to me that newer years have the SRT logo instead.

They definitely switched over at some point - the one I ordered back in 2017 for my Gen 4 had the SRT logo on it.

[Whiskey]

2014 GTS with Fangs logo.

Just goes to show that from Gen3 to Gen5 it's just incremental improvements. Strange that the chassis is basically the same from Gen3 to Gen5. Yes there are differences but they are incremental. Same with the engine/Drivetrain from Gen4-5 again incremental changes.

[SRT BILL]

2013 GTS also with Fangs logo.

[Steve M]

2014 GTS with Fangs logo.

Just goes to show that from Gen3 to Gen5 it's just incremental improvements. Strange that the chassis is basically the same from Gen3 to Gen5. Yes there are differences but they are incremental. Same with the engine/Drivetrain from Gen4-5 again incremental changes.

Bingo.

While I never seriously considered going to a Gen 5 for various reasons, I definitely appreciated how many parts carried over from previous gens...makes sourcing things like window regulators and other odds and ends that much easier. The Gen 5 certainly also enjoyed much better support from the aftermarket, some of which could also be used on the Gen 4 due to the similarities between the two.

[ViperSRT]

Change probably occurred when tooling replacement was required. With low volumes for Vipers tool changes even at 10,000 piece intervals are over several years.

[Whiskey]

Bingo.

While I never seriously considered going to a Gen 5 for various reasons, I definitely appreciated how many parts carried over from previous gens...makes sourcing things like window regulators and other odds and ends that much easier. The Gen 5 certainly also enjoyed much better support from the aftermarket, some of which could also be used on the Gen 4 due to the similarities between the two.

I've worked on all 5 of my Vipers. Two Gen2's, One Gen3, One Gen4 and now this Gen5. It's easy to see the evolutions.

[CNU_Physics]

Bingo.

While I never seriously considered going to a Gen 5 for various reasons, I definitely appreciated how many parts carried over from previous gens...makes sourcing things like window regulators and other odds and ends that much easier. The Gen 5 certainly also enjoyed much better support from the aftermarket, some of which could also be used on the Gen 4 due to the similarities between the two.

It's weird to me seeing dynos of Gen 4s and 5s and they are basically the same power. They shouldn't considering the Gen5 manifold is better and there were a few changes to the engine as well.

[SRT_BluByU]

they're not.. different days, different dynos, owner mods etc.

[Steve M]

It's weird to me seeing dynos of Gen 4s and 5s and they are basically the same power. They shouldn't considering the Gen5 manifold is better and there were a few changes to the engine as well.

Some of that is likely due to the different gears - 3.07s (Gen 4) vs. 3.55s (Gen 5). From what I remember, the taller gears always sapped a bit of power on the dyno.

With similar mods, there isn't a ton of difference between the two generations power-wise - the tune on the Gen 4s is very conservative compared to the Gen 5, so there's a lot to be gained there. From what I remember, the majority of the gains for the Gen 5 were attributed to:

1. New intake manifold
2. Slightly larger intake lobe on the cam
3. Higher flow exhaust
4. More aggressive tuning

Everything minus the cam can easily be transferred over to the Gen 4. I know of at least one person that had the Gen 5 cam transferred over during a rebuild of their Gen 4, and it didn't net much of anything from what I remember.

[Arizona Vipers]

It's weird to me seeing dynos of Gen 4s and 5s and they are basically the same power. They shouldn't considering the Gen5 manifold is better and there were a few changes to the engine as well.

It's not about the power, it's about the superior front/rear weight distribution, hugely lower center of gravity due to the carbon fiber body weight 180 lbs less etc. It's a vastly super car in every way, especially for the track.

[Steve M]

It's not about the power, it's about the superior front/rear weight distribution, hugely lower center of gravity due to the carbon fiber body weight 180 lbs less etc. It's a vastly super car in every way, especially for the track.

From the specs I've seen, the F/R weight distribution didn't change much (I've seen slightly rear biased for the Gen 4s depending on source). Lower center of gravity I'd buy with the carbon fiber body panels. How much less weight depends on the trim...from another post: https://driveviper.com/forums/threads/19643-Weight-Str-vs-gts-vs-TA-vs-ACR?p=317847&viewfull=1#post317847

2017 models:
SRT 3378
GTS 3415
TA 3390
TA2 3403
ACR 3374
ACR-E. 3392
(subtract 3 lbs for carbon fiber cross brace if an added option)

2016 Viper models:
SRT 3390
SRT w/ sidewinder II wheels 3366
TA2 3390
GTS 3415
GTS w/ sidewinder II 3399
ACR w/ extreme aero 3392
(subtract 3 lbs for CF optional engine brace)

2014 Viper Models:
SRT 3402
SRT w/ sidewinder II. 3378
TA1 3390
GTS 3415
GTS w/ sidewinders. 3399

2013 Viper models:
SRT 3354
SRT w/ track pack: 3297
GTS 3431
GTS w/ track pack. 3374

Lightest curb weight you could get was a 2013 SRT track pack car, coming in at 3,297 pounds. The published curb weight for the Gen 4 Vipers was around 3,440 pounds or so, which gets you at least somewhat close to your 180 pound estimate. The delta among the rest of the trims levels isn't much at all though.

[Arizona Vipers]

My 2013 track pack weighed 3180 no fuel. ACR is much lighter than that too when you take off the boat anchor wheels and tires, I lost 88 lbs going to Forgelines and Hoosiers.
I think the only other front engine production car with a rear weight bias was the Mercedes GT cars, with the GTR being 53/47
For the Viper this was a massive engineering achievement with a motor that huge. The real track advantages are the lower center of gravity though. Most of the weight savings was high up.
Plason Carbon had the 2013 weight savings over the Gen 4 on their site, but looks like their site is down. I took a screenshot from webarchive- https://web.archive.org/web/20200707043911/https://plasancarbon.com/projects/srt-viper-and-acr/

62 lbs from the hood/fenders assembly
53 lbs from the roof assembly!!
31 lbs off the liftgate (weighs just 9lbs now)
Bottom line for a track car, no matter what mods you do, what weight reduction you do, a Gen 4 body will always weigh 150 to 180 lbs more than a Gen 5 car. Go run some laps, then pull into the pits and strap 180 lbs of weight plates to your hood and roof and decklid and go back out and see what happens.
Going to a full carbon body was a must, despite the cost but they did it, and kept the car "cheap". Props do Dodge. It didn't' take long after that for BMW, Mercedes, pretty much everyone to start putting in carbon fiber roofs etc.


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[Steve M]

Good info...hadn't seen that breakdown before.

[CNU_Physics]

My 2013 gen 5 diff
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