Go Back   LS1TECH > CHASSIS, SUSPENSION, APPEARANCE > Gears & Axles
Sign in using an external account
Register Forgot Password?
Search

Gears & Axles
Driveshafts | Rearends | Differentials | Gears | 12 Bolt | 9 Inch | Dana
Sponsored by
JawsGear

Out with the 4.56s',OEM 3.23s' are back in

Reply
 
Thread Tools Search this Thread
Old 04-14-2012, 08:17 PM   #1
TECH Addict
 
FirstYrLS1Z's Avatar
 
Trader Rating: 3
Join Date: Aug 2004
Location: Euclid,Ohio
Posts: 2,387
Default Out with the 4.56s',OEM 3.23s' are back in

Been running 4.56s' in my A4 for 4 1/2 years. 1st & 2nd gear were wild,throttle response was immediate even with convertors(TCI 2800 & Yank SS 3600) as accelation occurred while the convertors were flashing up. Gas mileage was good,21.5 mpg (for reference,the OEM 3.23s gave 24.5 mpg under identical conditions) at freeway legal speeds (2500 rpm @ 60 mph & 3000 rpm @ 72 mph),even took 5 trips to Florida from northern Ohio.
Back in Oct.2003 on the way to Englishtown N.J. for SLP Aprreciation Day,developed a noise in rearend. Being that I've been doing rears since the 60s',the noise sounded like a passenger side carrier bearing,which eventually proved to be the case. The noise/growl never worsened.

here's the passenger side carrier bearing with 30,000 miles on it since it started to 'growl'.
Click the image to open in full size.
Click the image to open in full size.

4 years later the OEM rear was replaced with a rear containing 4.56s'. I had a housing with axles that I had picked up at a Canton Ohio swap meet,picked up a new Eaton posi at Summit from their 'demo/returned' corner for $200 (it was missing the spider center shaft,since I had a few-no problem). Had gearsets of every ratio for the GM 7.5/7.625 rear and decided why not go all the way with the 4.56s' (used Richmonds that I found for $25 at Canfield Ohio swap meet).Cleaned that housing and POR15'd it,used new bearings,set the pattern for a good centralized swipe and ended up at .006" lash. Had some 'noise' but I wasn't expecting quiet with a used gearset.

3.23 rear out,4.56 ready to go in
Click the image to open in full size.

Periodically looked at the wear pattern and it improved with mileage.Ran the rear for 4 1/2 years and 41,000 miles with no problems. I will probably miss those 4.56s'.
Rebuilt(cleaned,POR15'd,drilled & tapped a drain hole in the bottom) the OEM rear using everything from it except for bearings,seals,and a set of backing plates I had. Lash ended up at .0035" (a little tighter than what it should be) to get a good pattern.

The homemade/fabricated case speader worked well.
built-fabbed a case spreader

4.56 rear out,3.23 ready to go in
Click the image to open in full size.

Been running it for a week now and still quiet. I'll pull the cover tomorrow and see how the contact pattern is doing.

The 4.56 rearend will stay intact as it's usable. Another housing I have will probably be built with 2.73s',or 3.73s'.
__________________
Black 98Z A4 Yank SS3600 convertor,TCI deep pan,3.23s' w/Auburn posi:SLP driveshaft loop,STB,PHB,LCAs,'flow-pac CAI,SFC,take-off 17x9 SS rims;StainlessWorks 'Y' & chambered exhaust,BMR LCA Relos,Kenny Brown 6 Pt bolt-in cage,VGX pads-front,Strano road race pads-rear
Mods un-modded,4.56s' w/Eaton posi,QA1 Dble Adj rear shocks
2009 Yamaha FZ6
2009 Chevrolet Cobalt 1LT/2LT

Last edited by FirstYrLS1Z; 04-15-2012 at 07:51 PM..
FirstYrLS1Z is offline   Reply With Quote
Old 04-14-2012, 08:34 PM   #2
12 Second Club
 
guppymech's Avatar
 
Trader Rating: 7
Join Date: Jan 2010
Location: Chicagoland
Posts: 1,323
Default

You've been like the only guy running 4.56s in the 10 bolt. Now you're using 3.23s what a change. How do you like the looong pulls with the 3.23?
__________________
1994 Trans Am, M6 hardtop, hotcam, SLP mids, Strange S60 4.10
12.82@109.42 da1774
guppymech is offline   Reply With Quote
Old 04-14-2012, 08:47 PM   #3
TECH Addict
 
FirstYrLS1Z's Avatar
 
Trader Rating: 3
Join Date: Aug 2004
Location: Euclid,Ohio
Posts: 2,387
Default

I had the 3.23s' in for 6 years before I put the 4.56s' in,so I'm just back to what I had. After about a week now,I'm getting re-aquainted to them.
Top speed was not limited because of the 4.56s',had no problem reaching 130 with still a little more to go.
I was expecting the Yank SS3600 to act/feel 'loose' with the 3.23s',but it feels tight and street 'friendly'.
I've been just driving it normally and after I pull the cover tomorrow to inspect,if things look OK,I'll do a burnout and run.

Guess I'll have to remove the 4.56s' from my sig.
__________________
Black 98Z A4 Yank SS3600 convertor,TCI deep pan,3.23s' w/Auburn posi:SLP driveshaft loop,STB,PHB,LCAs,'flow-pac CAI,SFC,take-off 17x9 SS rims;StainlessWorks 'Y' & chambered exhaust,BMR LCA Relos,Kenny Brown 6 Pt bolt-in cage,VGX pads-front,Strano road race pads-rear
Mods un-modded,4.56s' w/Eaton posi,QA1 Dble Adj rear shocks
2009 Yamaha FZ6
2009 Chevrolet Cobalt 1LT/2LT
FirstYrLS1Z is offline   Reply With Quote
Old 04-14-2012, 08:47 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply


Tags
1994, 456, 456s, bearing, canton, carrier, end, firebird, gears, noise, ohio, pontiac, rear, speed, street, top


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are On
Refbacks are Off



Join Ls1Tech

All times are GMT -5. The time now is 04:42 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details