Gen 3 Diff Upgrade?

[Revolution]

He still need the diff and gears Victor nothing changes the Gen 4 is a good upgrade if you get it for the right price!

[Viktimize]

He still need the diff and gears Victor nothing changes the Gen 4 is a good upgrade if you get it for the right price!

Ya you're right. Brain fart for me, ignore me. lol

So what's a "good price" a fellow local Viper brother might be able to get a gen4 LSD for?? :-)

[Revolution]

Already gone to Matt sorry!

[Redx]

Ya you're right. Brain fart for me, ignore me. lol

So what's a "good price" a fellow local Viper brother might be able to get a gen4 LSD for?? :-)

Pm'd, local to you with a gen 4 diff.

[Turk]

all those road trips we are going to do this summer. (wink wink, nudge nudge)

I'm already working on opening up my schedule for the summer so that I can make it out on more road trips.

[Turk]

Quick question. Do the stub shafts on my gen 3 work with a gen 4 LSD (in a gen 3 housing)? I've heard they are compatible, but when I looked up the part #'s the gen 3 stub shaft had a different part # then the gen 4 ones.

[Garron]

Quick question. Do the stub shafts on my gen 3 work with a gen 4 LSD (in a gen 3 housing)? I've heard they are compatible, but when I looked up the part #'s the gen 3 stub shaft had a different part # then the gen 4 ones.

You will need gen 4 stub shafts.

[Joel]

I used my '03 axles in the upgraded rearend no problem. Got my Unitrax upgrade from JonB. Went right in, used old axles, and went about my business after carefully breaking in my new gears.

Quick question. Do the stub shafts on my gen 3 work with a gen 4 LSD (in a gen 3 housing)? I've heard they are compatible, but when I looked up the part #'s the gen 3 stub shaft had a different part # then the gen 4 ones.

[Revolution]

Like I said Matt give Devon a call he will set you straight!

[Turk]

Like I said Matt give Devon a call he will set you straight!

Ya I'll call Devin. I should have thought about this earlier, my 3.55 gears from Devin landed 2 days ago.

[J TNT]

Your in good hands ! And will cut out the middle man !

[10BANGER]

I went with the Gen 4 upgrade and the 3.55 ratio all done by Unitrax. Devon really knows his way around rears.

[PaulP]

So from reading this sounds like a 50/50 lol , will a gen 4 diff work in a gen 3 with stock gen 3 shafts?

[ACtechOPS]

I put a Gen 4 diff from a 2009 (3000miles) in my 2004 this winter. It bolts right in, use your original drive shaft and rear half-shafts. Only thing you need to buy new is a strap kit to reattach the drive shaft. My diff was a high miler and getting the half shafts off the stub axles was a huge PITA. Penetrating oil, 10,000lb straps to provide a constant pulling force and a 3' 2x4 driven by an 8lb sledge. The things you do when you don't own the puller.

[PaulP]

Awesome Thanks for the reply and tips ACtechOPS!
i ordered a gen 4 diff can't wait to install it.

[Garron]

So from reading this sounds like a 50/50 lol , will a gen 4 diff work in a gen 3 with stock gen 3 shafts?

The 'axle shafts' are the same.

There is a little 'stub shaft' on each side of the diff. They are different gen 3 to 4.

If you get a complete diff it may already have the gen 4 stubs

[ACtechOPS]

As long as you buy a complete OEM gen 4 diff, it will plug right in. The stub axle diameter and spline count are the same (2003-2010 use same OEM half shafts). I have another option that a buddy did. He bought a gen 5 diff, swapped the stub axles and put it in his gen 3. Even though the rear housing looks different, he said it bolted in no issues. His gen 5 stubs are currently for sale on the Alley. I picked up my low mile gen 4 diff for $1000 (Canadian, so that's about $800 US), probably the most economical way to go. It is mated to a TR6060, so my '04 now has a Gen 4 drive train.

[Stealth78]

Wow, this thread is awesome. Apparently I'm not the only one that hates my Gen3 diff... Definitely going to be one of my first mods, now to try and figure out which to go with. My car will probably be about 70% street/ 30% track, any suggestions that best suit?

[Sharky]

I have a Gen 4 diff in my 06 Coupe due to the fact that there were some grouches out of the teeth of a couple of gears on the factory. Works very well and since I run considerably more hp than factory through my car it was I believe a very good idea.

[Redx]

Is the Gen 3 diff housing the same as the gen 4?

[ACtechOPS]

From what I understand, the housings are the same but guts are different. Sitting side by side on the floor, you would be hard pressed to tell one from the other and I have had both together.

[Sharky]

From what I understand, the housings are the same but guts are different. Sitting side by side on the floor, you would be hard pressed to tell one from the other and I have had both together.

Exactly

[Garron]

Is the Gen 3 diff housing the same as the gen 4?

Same part number

[Joel]

What do you "hate" about it? There have been plenty of threads on this. If you don't like the action of the OEM Trak Lok ( I think that's what it's called) of the stock rear end then you might want to consider after market like Giken or Wavetrack. Why don't you call JonB, or Unitrax or Bill Pemberton. All were helpful to me when I first got my car and wanted to make some improvements to the gearing. I really like the 3.55 gear with Gen 4 upgrades that I got from Unitrax through JonB but you may want more. (I do track my car but not a lot. The biggest problem with my old rear end was it was said to be weak but there are lots of cars running around with "weak" rear ends. I did not have any other problems other than I did not like the 3.07 gear) But more costs more and you can easily spend upwards of $3000 for something you don't really need. I can' remember the site, but I think Unitrax used to have an explanation of different steps of the evolution of rear differentials for Vipers.

Wow, this thread is awesome. Apparently I'm not the only one that hates my Gen3 diff... Definitely going to be one of my first mods, now to try and figure out which to go with. My car will probably be about 70% street/ 30% track, any suggestions that best suit?

[Stealth78]

What do you "hate" about it? There have been plenty of threads on this. If you don't like the action of the OEM Trak Lok ( I think that's what it's called) of the stock rear end then you might want to consider after market like Giken or Wavetrack. Why don't you call JonB, or Unitrax or Bill Pemberton. All were helpful to me when I first got my car and wanted to make some improvements to the gearing. I really like the 3.55 gear with Gen 4 upgrades that I got from Unitrax through JonB but you may want more. (I do track my car but not a lot. The biggest problem with my old rear end was it was said to be weak but there are lots of cars running around with "weak" rear ends. I did not have any other problems other than I did not like the 3.07 gear) But more costs more and you can easily spend upwards of $3000 for something you don't really need. I can' remember the site, but I think Unitrax used to have an explanation of different steps of the evolution of rear differentials for Vipers.

The actual strength of the limited slip is what I can't stand. I haven't even had the car on track yet but even on the street on aggressive corners I feel like the car likes to boil the inside tire. I feel as if I'm having to really finesse the throttle and work the wheel more than I should need to. I feel as the diff is a bit unpredictable and with that it almost feels like the car wants to step out without warning.