Need some advices brothers - Chevy Impala SS Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 28 (permalink) Old 11-16-2016, 12:04 AM Thread Starter
Senior Member
 
Don.V's Avatar
 
Join Date: Jul 2011
Location: Nor. Cal
Posts: 226
 
Garage
Need some advices brothers

I have a 96 Imp with 135,xxx miles and completely stock. I want to change my rear end set up; meaning what brand of posi, do I need new axles for it, do I need to tune it for higher ratio gears? It's going to be my daily driver and I like to drive on the freeway a lot. I'm starting with my rear end because it is making a growling noise. In the future I will like to add some bolt on power, maybe change the stall converter and tune it. I'm open for some advices. Thanx.

Last edited by Don.V; 11-16-2016 at 12:07 AM.
Don.V is offline  
Sponsored Links
Advertisement
 
post #2 of 28 (permalink) Old 11-16-2016, 06:57 AM
Senior Member
 
Fred Kiehl's Avatar
 
Join Date: Feb 2009
Location: Largo, FL 33774
Posts: 10,836
 
Most of the performance people here will recommend 3.73 gears. The Detroit Truetrac posi is probably the most trouble free differential, and Moser axles are among the best, for not much more than the Chinese ones offered at the local parts store.


When you go to a different stall converter, make sure it is matched to your torque and HP curve. If you are going to be hotrodding a little, have the trans built to take a beating, because yours is getting a little long in the tooth at this point.


It will require you to tune for the gear ratio, and any engine mods.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
Fred Kiehl is offline  
post #3 of 28 (permalink) Old 11-16-2016, 10:53 AM
Senior Member
 
Join Date: Apr 2001
Location: Moorpark, CA
Posts: 8,430
 
Garage
Get a Eaton "posi" limited slip differential (400 lb springs). You will also need a bearing kit for it

https://www.summitracing.com/parts/e...view/year/1996

This is the clutch type LS vs the gear type (Detroit Truetrac) and is rebuildable...although I have not needed to in the 15 years I have had mine with hundreds of 1/4 mi passes....YMMV

gear selection is a personal preference. For a DD automatic "I" preferred the 3:42 vs 3:73 but others like the 3:73. At Fwy speeds with a stock 27" tire RPM's are around 2500-2700 rpm with 3:73. There are online calculators you can use by entering tire size/gear ratio and get RPM's at x MPH if you want to consider gear selection

you do need a PCM re-calibration to get the speedo right when changing gear ratios. Those hand held HyperTech are good for that...but thats about all those are good for. A PCM tune would cost less

Axles. Moser are good. I have Superior hardened axles. Your stock ones "may" be OK. Won't know till you take them out. Often they are worn at the outer bearing area

Also going lower gears many find they now have driveline vibrations because of increased drifeshaft RPM. You can try and have the stock DS re-balanced but limited success on that for most. A thicker DS, aluminum, from Dennys is highly recomended

\'96 BBB 383/T-56
BALLSS is offline  
 
post #4 of 28 (permalink) Old 11-19-2016, 03:19 AM Thread Starter
Senior Member
 
Don.V's Avatar
 
Join Date: Jul 2011
Location: Nor. Cal
Posts: 226
 
Garage
Thanx guys.
Don.V is offline  
post #5 of 28 (permalink) Old 11-19-2016, 11:17 AM
Senior Member
 
jasonlachapelle's Avatar
 
Join Date: Oct 2006
Location: CFB Bagotville, Qc
Posts: 1,537
 
If you don't drag race the car, I'd go for the Truetrac vs the Eaton clutch type posi as well. I think it's a better differential for a DD. I also prefer 3.42 gears for a true DD, but then I have never had an Impala SS. I've always stepped up from 2.56 gears. It seems the bump from 3.08 to 3.42 might not justify the cost of the swap.

Jason
1996 Roadmaster Wagon
1995 Caprice Wagon
jasonlachapelle is offline  
post #6 of 28 (permalink) Old 11-24-2016, 07:46 AM
Senior Member
 
juniorwatson's Avatar
 
Join Date: Aug 2007
Location: Georgetown, TX
Posts: 2,490
 
I agree with what Fred & BALLS wrote 100%. I bought my entire setup, 1-stop shopping, from Dan @ Clear Image Automotive.

The 3.73s was the first mod I did to my 9C1 a few months after I bought her. It was one of the best performance upgrades I made, second to a PCM tune, which you will need once the work is finished.

I have over 100,000 miles on my rear, and contrary to to the myth that some people write about, I have been using Amsoil synthetic gear oil for the entire time. The Marine who installed the rear for me, told me to do that, and I have had ZERO problems.

You'll want to seek out someone who does rear end or transmission work for the upgrade. Don't just go to the local guy around the corner. You'll want to research this a bit. A recommendation is to seek out guys that do a lot of 4X4 work, as they usually upgrade/change gear ratios a lot.

Also, as far as axles are concerned, what Fred wrote is also right on the ball. I didn't need to R&R the axles when I upgraded the rear end. Typically the only thing that will ever go wrong with an axle is the outer surface where it rides on the axle bearing.

If you do need axles, go with Moser. I did upgrade my axles about 4 years ago and went with them, and it was a perfect fit with killer quality.

Good luck.

Clear Image Tri-Ys & Hi-Flow cats >> 2.5" X-Pipe & Magnaflow Tri-Chambers, Mike Harris 4L60E, Circle-D 2,400 RPM TC, All MOOG FT End & Del-A-Lum bushed MOOG CTRL Arms, Eibach FT & New Stock HT rear springs. Hotchkis Sway Bars & End Links, RAISS, 3.73 Gears in Eaton carrier, Dynoshaft & CIA Loop, BMR Trailing Arms, Braided Brake Hoses, Taylor Spiro-Pro Wires, AutoMeter Water Temp & Oil PSI Gauges, Impala Console. ATE Blue Brake Fluid. Skip White distributor. 20's, Z28 Cluster, Corbeau GTS Seat
juniorwatson is offline  
post #7 of 28 (permalink) Old 01-03-2017, 09:14 PM Thread Starter
Senior Member
 
Don.V's Avatar
 
Join Date: Jul 2011
Location: Nor. Cal
Posts: 226
 
Garage
Quote:
Originally Posted by Don.V View Post
I have a 96 Imp with 135,xxx miles and completely stock. I want to change my rear end set up; meaning what brand of posi, do I need new axles for it, do I need to tune it for higher ratio gears? It's going to be my daily driver and I like to drive on the freeway a lot. I'm starting with my rear end because it is making a growling noise. In the future I will like to add some bolt on power, maybe change the stall converter and tune it. I'm open for some advices. Thanx.
I have a question.... Will my gears make growling noises if too much additive is added to the gear oil?
Don.V is offline  
post #8 of 28 (permalink) Old 01-03-2017, 09:51 PM
Senior Member
 
Fred Kiehl's Avatar
 
Join Date: Feb 2009
Location: Largo, FL 33774
Posts: 10,836
 
Put the recommended amount of additive in, then fill it with gear oil, and you should be fine.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
Fred Kiehl is offline  
post #9 of 28 (permalink) Old 01-04-2017, 07:10 AM
Senior Member
 
91ss's Avatar
 
Join Date: Dec 2008
Location: NYC
Posts: 1,348
 
Quote:
Originally Posted by Don.V View Post
I have a question.... Will my gears make growling noises if too much additive is added to the gear oil?
Additive will make no difference to the gears. It only affects the 'grabbyness' of the friction plates in the posi unit.

Gear noise is usually the fault of the installation or cheap set of gears.
91ss is offline  
post #10 of 28 (permalink) Old 01-06-2017, 12:16 AM Thread Starter
Senior Member
 
Don.V's Avatar
 
Join Date: Jul 2011
Location: Nor. Cal
Posts: 226
 
Garage
Thanx guys.
Don.V is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy Impala SS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome