[427Charlie]

So what are peoples experience/thoughts on switching to the 3.27? I was pretty convinced I wanted the 3.45s but I found a good deal on a 3.27 I probably shouldn't pass up...

 

[lvgmman]

Just preference if my car was n/a close to stock power I would have 3.45 or more. My car is procharged once the gears are in the car should be low 800 rwhp I believe the 3.27 will help me get a more consistent 60'. The 2.92 always felt like it made it so hard to get out to 60'. My best 60 was a 1.82.

 

[aubeagle]

Any 5th gen SS manual will have 3.45's with an LSD in it. The auto SS's and manual v6's have 3.27's with an LSD in them. The only one to avoids are the auto V6's and the ZL1 diff.

http://www.car-part.com/ is a good place to hunt for one along with the suggestions fleetman made.

Thanks for the link, I starting to forget a lot of things. I have a short cut to that site looking right at me.. Man I need to open my eye's. I see in your Sig that your in MD. I've been there a few times years ago. Had a few friends in that area.

S.

 

[427Charlie]

Well I bought the 3.27 LS camaro diff...I wanted the the 3.45 but i got this one was so cheap I had to. and it only has 13k on it from a wrecked '12 ss. Might install it tomorrow if I can get the fluid and have time after I install my shinny new Brembos

 

[aubeagle]

Well I bought the 3.27 LS camaro diff...I wanted the the 3.45 but i got this one was so cheap I had to. and it only has 13k on it from a wrecked '12 ss. Might install it tomorrow if I can get the fluid and have time after I install my shinny new Brembos

That is tooo cool brakes and a rear. Slow quick and go quick at the same time.. Let us know how it all works out for ya..

S.

 

[mjones73]

Thanks for the link, I starting to forget a lot of things. I have a short cut to that site looking right at me.. Man I need to open my eye's. I see in your Sig that your in MD. I've been there a few times years ago. Had a few friends in that area.

S.

I'm up in Cecil County close to Delaware.

 

[00turbot/a]

Any whining out of the gears? I have heard a couple of people had that complaint. Just wasnt sure if it was install and the wrong shimming or the gear itself

 

[Supercharged]

Stiffer poly bushings and the incorrect gear oil or lack of limited slip modifier can also cause noise.

 

[fleetmanlv]

i started reading this, then i saw you lived in vegas. then i realized i know who you are. i still haven't put in my 3.27's since i decided to do a lot more stuff when it cools off :gr_devil:

oh dang, lol. whats up thomas?! i havent been on here for almost a month. still loving my 3.45's let me know when your ready to install your 3.27's. ill be more than happy to give you a hand.

 

[lvgmman]

It's at the bottom of my parts pile lol. Soon when it's less that 129493992 degrees outside it's among all the stuff getting finished up on my car

 

[gryghst72]

When you did the rear diff swap, did you reuse the (3) driveshaft coupling to diff flange bolts? Or did you replace them? Also, what fluids did you end up using and how much each? I plan to do this swap this weekend. Thanks.

 

[Pontiac88]

When I changed mine, I reused the driveshaft bolts. Before I did the replacement, I searched around on here and other forums and did not see anyone metion replacing them. I made the assumption they were OK to reuse. If you take off the axle nuts (which I did not do when I swapped my differential) GM recommends that they be replaced and torqued properly. I know alot of people who take them off during the swap re-use them with no issues.

I used a quart of 75W-90 Royal Purple max gear oil. It does not require the addition of friction modifier. I went this route because I found alot of conflicting information about the proper fluids, and friction modifier as well as quantities. I went with RP so I didn't have to worry about adding anything.

Also note TSB PI0137C specifies updated axle seals that are less prone to leaking with the updated synthetic gear oil. The seals are GM P/N 22798805. They are easy to replace and IMO it is worth replacing to ensure you have the proper seals to avoid having to tear it apart because of a leak down the road

 

[vettewreck]

So what are peoples experience/thoughts on switching to the 3.27? I was pretty convinced I wanted the 3.45s but I found a good deal on a 3.27 I probably shouldn't pass up...

This is my predicament. I can't seem to find a decent deal on the 3.45s but my buddy has a 3.27 laying around for cheap. But I don't want the 3.27

 

[427Charlie]

This is my predicament. I can't seem to find a decent deal on the 3.45s but my buddy has a 3.27 laying around for cheap. But I don't want the 3.27

I haven't been in a car with 3.45s yet but the 3.27s are definitely better than our stock gears. plus my old limited slip was pretty much toast

 

[RacnJsn95]

Just installed the 3.27 rear last weekend. Got a pretty good deal on it compared to what I see the 3.54's going for I think. Axle seals are like 9 bucks each, I went ahead and replaced them before the new diff went in.

Pretty happy with it personally. I would have went with the 3.54 if I could have found one for the price I paid for the 3.27, but I also have another 8.6" posi unit here with a 3.27 R&P that I can use, beef up, swap out gears, or if I ever need replacement parts etc.

After tweaking the shift points in my tune, I picked up about 2 tenths (so far, I still think there is more to be had) over the 2.92 diff that came out. Plus, I really enjoy driving the car and I'm not going to go bat $#!7 crazy with the car, because, yeah, I want it to be quick on the track, but I want to be able to jump in it and drive 3-4-500 miles and get half way decent mpg... 3.27 was kind of a compromise, plus it was a good deal.

I definitely wouldn't kick 3.27 out of bed... Plus, I think Rick Crawford just posted a G8 he supplied some service/parts for with 3.27's that ran an 11.17 @ 120 w/ a 1.4x 60' time... Doesn't appear to be that wild of a car mod wise.

 

[G_eightGT]

Anybody spending on JRE posi mod?

 

[gmonde]

how did you guys recalibrate the speedo for the gear changes ??

 

[JCMG8]

Anybody spending on JRE posi mod?

Yes, works as advertised.

how did you guys recalibrate the speedo for the gear changes ??

HPTuners / EFILIVE. Need to change shift algorithms, not just Speedo display.

 

[427Charlie]

how did you guys recalibrate the speedo for the gear changes ??

I used my cortex tuner, it was easy

 

[RacnJsn95]

Hp tuners. Depending on the version, it can also calculate the new shift speeds/rpms.