Rear Differential Convert to a posi trac - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

BlackBird1 · 03-01-2023, 03:57 PM

Has anyone converter the factory limited slip differential to a limited posi trac with Eaton Detriot posi truetrac differential? If so do you have step by step installation. Thank you

bottletalk · 03-01-2023, 04:00 PM

I did....download the instructions and follow them, then set up just like a ring pinion install.

gtstorey · 03-01-2023, 04:01 PM

It's going to be the same as any other diff swap or gear swap. You will have to have the know how and tools to measure and set it up. I think it's common on these to also need a case spreader.

Joe.G · 03-02-2023, 07:21 AM

A case spreader is highly recommended, I didn't have one when I did mine and wish I did lucky I was able to get mine set with only having to pull it back out once. I also recommend getting a beam type torque wrench to set pinion preload. I replaced all of the bearings and seals and don't forget indicator to check backlash.

SS_CTS-V · 03-03-2023, 01:05 PM

I tried, and failed, but I was also adding 3.91 gears. Lost patience with taking the diff back out to get the spacing and depth correct. Ended up, just buying a built unit from JRE. Not the cheapest option, but I know it's well built and will last. As a bonus I upgraded from 3.91 to 4.11 gears. Something to consider if you are not experienced with setting up gears. I've done a few on 4th Gens and they were MUCH easier.

bottletalk · 03-03-2023, 01:09 PM

Quote:

Originally Posted by SS_CTS-V

I tried, and failed, but I was also adding 3.91 gears. Lost patience with taking the diff back out to get the spacing and depth correct. Ended up, just buying a built unit from JRE. Not the cheapest option, but I know it's well built and will last. As a bonus I upgraded from 3.91 to 4.11 gears. Something to consider if you are not experienced with setting up gears. I've done a few on 4th Gens and they were MUCH easier.

does jre use the crush washer? that's the weak point.
rather do my own work....hear what ur saying though.

CamaroCracka · 03-03-2023, 02:11 PM

Quote:

Originally Posted by bottletalk

does jre use the crush washer? that's the weak point.
rather do my own work....hear what ur saying though.

GM uses crush sleeves in a ton of diffs. I take it you have seen a lot of failures? I know it makes me not want to mess with a diff that is not leaking bad or making noise. Where do you even get the correct spacers to use in place of the crush sleeve?

bottletalk · 03-03-2023, 02:28 PM

Quote:

Originally Posted by CamaroCracka

GM uses crush sleeves in a ton of diffs. I take it you have seen a lot of failures? I know it makes me not want to mess with a diff that is not leaking bad or making noise. Where do you even get the correct spacers to use in place of the crush sleeve?

https://nitro-gear.com/nitro-gear-ax...id-spacer.html

https://www.yukongear.com/shop/sk-csgm8-5

it's proven that the crush sleeve moves on high torque applications, once it moves your bearing preload changes as well as your pinion depth which effects your ring backlash.
ask your gear manufacturer of choice for a solid pinion spacer or a crush sleeve eliminator for your diff. they are common items.

bottletalk · 03-03-2023, 03:09 PM

https://youtu.be/5oALDmW5txY

https://youtu.be/iZInF95qHX8

I repair CNC machines and process automation systems for a living, haven't worked on a ton of diffs but I have seen my share of gear boxes and the gear boxes that use crush sleeves on our machines have to be changed to solid spacers or accurate consistency will not be met....talking +/- .0002" accuracy. sure it's not a car but the same principles apply. mechanical accuracy=max strength, long life with minimal failures.

CamaroCracka · 03-04-2023, 05:36 AM

Thanks Bottle. Hopefully they make them for the ZL1 diff.

SS_CTS-V · 04-06-2023, 02:49 PM

Quote:

Originally Posted by bottletalk

does jre use the crush washer? that's the weak point.
rather do my own work....hear what ur saying though.

Honestly I'm not sure. You'd have to contact JRE and ask. That said, I don't have a ton of HP/TQ in my car so I can't give an opinion there. BUT after a few miles w/ the 4.11 and TruTrack diff, I love this setup.

03-01-2023, 03:57 PM	#1
BlackBird1 Drives: Chevy camaro SS Join Date: May 2020 Location: Maryland Posts: 19	Rear Differential Convert to a posi trac Has anyone converter the factory limited slip differential to a limited posi trac with Eaton Detriot posi truetrac differential? If so do you have step by step installation. Thank you

03-02-2023, 07:21 AM	#4
Joe.G Drives: 2014 2SS/RS 6SP Ashen Grey Join Date: Aug 2021 Location: NY Posts: 1,265	A case spreader is highly recommended, I didn't have one when I did mine and wish I did lucky I was able to get mine set with only having to pull it back out once. I also recommend getting a beam type torque wrench to set pinion preload. I replaced all of the bearings and seals and don't forget indicator to check backlash. __________________ GM 3.91/TrueTrac OEM ZL1 Rims, Brakes & Side Skirts.ACST4 Splitter/Deflectors NPP M2W,GM Short Throw,Remote Clutch reservoir GPI Ported Rod Mod,BO White PTB,CAI/JRE Scoop, Moroso Catch Can GC Aluminum DS Stainless Works Ceramic LTH/HiFlo Cats SCT X4 Dynosteve, Hotckis 1" Springs & Chassis Max Brace BMR Adjustable Swaybars,Trailing Arms, Adjustable Toe Rod, LCA & Z28 UCA Bushings Hendrix Solid Cradle Bushings Pedders Radius Rod Inserts Strut tower brace Hero Smoked Tail and 3rd Brake Light, Diode Dynamic SL1 Fog Lights AeroForce Dual gauge/Autometer pillar mount.

03-04-2023, 05:36 AM	#10
CamaroCracka Drives: 2010 Turbo LS3 Join Date: Dec 2009 Location: Palm Bay, FL Posts: 2,747	Thanks Bottle. Hopefully they make them for the ZL1 diff. __________________ 2010 SS - On3 kit with downpipe cutout, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1/1LE brakes. 2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. ZL1 brakes.

03-01-2023, 04:00 PM	#2
bottletalk Drives: 15 Camaro 2SS M6 Join Date: Jan 2020 Location: BC Posts: 732	I did....download the instructions and follow them, then set up just like a ring pinion install.

03-01-2023, 04:01 PM	#3
gtstorey Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017 Location: Huntsville, AL Posts: 2,172	It's going to be the same as any other diff swap or gear swap. You will have to have the know how and tools to measure and set it up. I think it's common on these to also need a case spreader.

03-03-2023, 01:05 PM	#5
SS_CTS-V Drives: 2015 SS, 2006 CTS-V (wrecked...) Join Date: Jul 2017 Location: Tampa Posts: 151	I tried, and failed, but I was also adding 3.91 gears. Lost patience with taking the diff back out to get the spacing and depth correct. Ended up, just buying a built unit from JRE. Not the cheapest option, but I know it's well built and will last. As a bonus I upgraded from 3.91 to 4.11 gears. Something to consider if you are not experienced with setting up gears. I've done a few on 4th Gens and they were MUCH easier.

03-03-2023, 03:09 PM	#9
bottletalk Drives: 15 Camaro 2SS M6 Join Date: Jan 2020 Location: BC Posts: 732	https://youtu.be/5oALDmW5txY https://youtu.be/iZInF95qHX8 I repair CNC machines and process automation systems for a living, haven't worked on a ton of diffs but I have seen my share of gear boxes and the gear boxes that use crush sleeves on our machines have to be changed to solid spacers or accurate consistency will not be met....talking +/- .0002" accuracy. sure it's not a car but the same principles apply. mechanical accuracy=max strength, long life with minimal failures.