Posi or limitedslip? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72superBB · 11-25-2003, 01:23 AM

Has anyone out there( Iknow someone has) taken a rear end with limited slip or posi out of later model trucks and put in their 67-72? I currently have a one wheel burnout monster of a truck, but want more traction. I am sure there has to be some modifications for that to be done. WHat other options are there out there? Can I replace the insides of my rear axle to accompolish this?

thanks

minus one side!

jhow66 · 11-25-2003, 01:36 AM

Had same problem. Got a Eaton Posi unit from Reider Racing. (other places carry it also). All you have to do is take your ring gear off your present carrier and install it on the new Eaton carrier and reinstall in rear end. I didn't have to adjust anything. Piece of cake. Now I can lay down 2 lines of rubber.

Injected68LS1 · 11-25-2003, 03:48 AM

Check out www.markwilliams.com. Under their specials section they have eaton posi for $310. That's a deal if you can afford a new one. You can usually pick up new gears for another $150 and bearing kit for another $100.

gonebad2 · 11-25-2003, 03:57 AM

Nothing beats a good two legger burnout.

dinnut · 11-25-2003, 04:08 AM

http://nationaldrivetrain.com/shopsi...ml/page35.html

like 350 for a new 3.73 eaton posi

70c10 · 11-25-2003, 09:25 AM

I paid $280 for my Eaton at www.tomsdifferentials.com

72superBB · 11-25-2003, 10:49 AM

So how many different parts will I need to switch out my current setup?

I know I need the eaton posi unit.

What are the gears and the bearing kit?

jhow66 says use existing gears and Injected68LS1 says to get new ones.

THanks guys

70c10 · 11-25-2003, 02:32 PM

I paid $25 extra for new bearings and races. I reused my 3:73 gears.

PR454SS · 11-25-2003, 02:40 PM

Quote:

Originally posted by 70c10
I paid $280 for my Eaton at www.tomsdifferentials.com

I checked that link, pretty good selection of gears for the 12 bolt, any one running the 3.91 to 1 gears they offer? Looks like it might be a good comprimise between 3.73 and 4.11

72superBB · 11-25-2003, 02:43 PM

What gear ration should I use for my truck?

402 BB
Turbo 400 tranny.

I think it currently has 3.07, but I am not for sure.

70c10 · 11-25-2003, 02:55 PM

What is the intended use and what tire height are you running?

SWEET7T · 11-25-2003, 02:57 PM

Well, where do you drive it...
I mean, do you use the truck for just cruizing around town, interstate driving, hauling/pulling?

A 3.07 would be great if you drive the truck long distances, it will help your mpg.
If you stay in town or tow, I would choose a 3.73, or even a 4.10 for more grunt

TEXAS 68 · 11-25-2003, 04:35 PM

I have 2 12 bolt 3.73 rear ends 1 wheel peel, would it be best to put the eaton posi unit in rather than buying a complete rear end ??

jhow66 · 11-25-2003, 06:49 PM

72superBB I had the same setup as yours ( 402-400turbo-3.07 gear). If it is your daily driver the 3.07 will be fine. Just add new carrier bearings like the other guys say. That plus a gasket and Posi fluid will be all you need.

11-25-2003, 01:23 AM	#1
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	Posi or limitedslip? Has anyone out there( Iknow someone has) taken a rear end with limited slip or posi out of later model trucks and put in their 67-72? I currently have a one wheel burnout monster of a truck, but want more traction. I am sure there has to be some modifications for that to be done. WHat other options are there out there? Can I replace the insides of my rear axle to accompolish this? thanks minus one side! __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

11-25-2003, 01:36 AM	#2
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Had same problem. Got a Eaton Posi unit from Reider Racing. (other places carry it also). All you have to do is take your ring gear off your present carrier and install it on the new Eaton carrier and reinstall in rear end. I didn't have to adjust anything. Piece of cake. Now I can lay down 2 lines of rubber. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

11-25-2003, 03:48 AM	#3
Injected68LS1 Registered User Join Date: Jul 2003 Location: So. Cal. Posts: 389	Check out www.markwilliams.com. Under their specials section they have eaton posi for $310. That's a deal if you can afford a new one. You can usually pick up new gears for another $150 and bearing kit for another $100. __________________ 1968 Chev SWB with 1998 Corvette LS1 305hp and 320 ftlb to the wheels (stock engine!) AEM EMS and wideband O2 sensors Bowtie Overdrive's 700R4, stage 3 Baer 4 wheel discs and 20s http://iciclelanding.com/aperture?album=2049&view=album

11-25-2003, 03:57 AM	#4
gonebad2 Merciless Butcher Join Date: Oct 2003 Location: CC Nevada Posts: 1,447	Nothing beats a good two legger burnout. __________________ Your Bought And Sold....I Got Your Soul!

11-25-2003, 04:08 AM	#5
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	http://nationaldrivetrain.com/shopsi...ml/page35.html like 350 for a new 3.73 eaton posi __________________ 70 longbed 496/th400/Ford 9"

11-25-2003, 09:25 AM	#6
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	I paid $280 for my Eaton at www.tomsdifferentials.com __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

11-25-2003, 10:49 AM	#7
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	So how many different parts will I need to switch out my current setup? I know I need the eaton posi unit. What are the gears and the bearing kit? jhow66 says use existing gears and Injected68LS1 says to get new ones. THanks guys __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

11-25-2003, 02:32 PM	#8
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	I paid $25 extra for new bearings and races. I reused my 3:73 gears. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

11-25-2003, 02:43 PM	#10
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	What gear ration should I use for my truck? 402 BB Turbo 400 tranny. I think it currently has 3.07, but I am not for sure. __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

11-25-2003, 02:55 PM	#11
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	What is the intended use and what tire height are you running? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

11-25-2003, 02:57 PM	#12
SWEET7T Try spinnin 4 rear tars Join Date: Sep 2003 Location: Salt Lake City, Utah Posts: 757	Well, where do you drive it... I mean, do you use the truck for just cruizing around town, interstate driving, hauling/pulling? A 3.07 would be great if you drive the truck long distances, it will help your mpg. If you stay in town or tow, I would choose a 3.73, or even a 4.10 for more grunt __________________ SWEET7T 1970 C10, 2wd, LB, 307/TH350/3.08. PS, PB

11-25-2003, 04:35 PM	#13
TEXAS 68 Vortec in the works Join Date: Nov 2003 Location: Spring,Texas Posts: 735	I have 2 12 bolt 3.73 rear ends 1 wheel peel, would it be best to put the eaton posi unit in rather than buying a complete rear end ?? __________________ 68? It's all figured out untill you get it apart. Is it Sunday yet??? 68 Project 68 SWB frame off/98 Vortec with stock FI/power everything. 95 ECLB 2500 with 346,000 on the clock(the original HD) 99 Lesabre-wifes ride 08 Crew Cab LTZ-All Mine 89 SWB 5/7 drop-Son's first ride.

11-25-2003, 06:49 PM	#14
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	72superBB I had the same setup as yours ( 402-400turbo-3.07 gear). If it is your daily driver the 3.07 will be fine. Just add new carrier bearings like the other guys say. That plus a gasket and Posi fluid will be all you need. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer



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