best street/strip 12 bolt diff - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bad70sbchevy · 10-20-2013, 11:30 PM

Hey everybody! I'm thinking about finally ditching the open differential in my truck. I was just curious if anybody had any suggestions for a differential for a street/strip truck. I've been looking at the Detroit TrueTrac, but wasn't sure how well they "lock up" during a launch. Also been looking at Detroit Lockers and Auburn Limited Slips as well. I have the factory truck 12 bolt, TH400, 355sbc with guesstimated 425hp at the flywheel and I'll be going to either a 4.11 or 3.73 rear gear. Thanks in advance.

ProStreet68SB · 10-21-2013, 09:45 AM

Eaton /thread

69GMC910 · 10-21-2013, 08:43 PM

I have the Eaton in mine and am very happy with it so far.

BigDan3131 · 10-21-2013, 10:09 PM

There are a few other questions that need to be answered. First up is how often do you drive this truck? Is it a DD or weekend ride? Do you plan to add more power to it? Street tires or something like the ET Streets? If its anything other than street tires I suggest having Ford ends put on and stronger axles added then the Truetrac or Locker.

If its your DD and no more power than what you have with street tires I love my Auburn Pro Series, it hasn't let me down yet.

Bad70sbchevy · 10-22-2013, 01:33 PM

Thanks everybody for the replies. As of right now, its a weekend driver and occasionally drive it 1-2 times during the week. For now I'm going to "try" and leave her alone since I'm in college now, but after I get out I do plan on adding more power. Right now it has 275/60R15 street tires on the back. I was told when it had 4.11s in it previously it would dead hook at the track, but not at all on the street.

**bigsnookmaster** · 10-22-2013, 09:32 PM

My Auburn Pro Series went south, so I replaced it with a Yukon Trac-Lock race posi. It works very well with no chatter whatsoever! I have a 9" with a Strange nodular center section. I had to do a considerable amount of clearancing in my carrier though. It was a much larger posi. Very nice unit though! .02

10-20-2013, 11:30 PM	#1
Bad70sbchevy Registered User Join Date: Aug 2009 Location: Newberry,FL Posts: 277	best street/strip 12 bolt diff Hey everybody! I'm thinking about finally ditching the open differential in my truck. I was just curious if anybody had any suggestions for a differential for a street/strip truck. I've been looking at the Detroit TrueTrac, but wasn't sure how well they "lock up" during a launch. Also been looking at Detroit Lockers and Auburn Limited Slips as well. I have the factory truck 12 bolt, TH400, 355sbc with guesstimated 425hp at the flywheel and I'll be going to either a 4.11 or 3.73 rear gear. Thanks in advance. __________________ 1970 Chevrolet C-10 w/355sbc 2010 Silverado Daily Driver 1971 Mercedes 280sl project car

10-21-2013, 09:45 AM	#2
ProStreet68SB The Engine Whisperer Join Date: Sep 2006 Location: Ohio Posts: 770	Re: best street/strip 12 bolt diff Eaton /thread __________________ -Automatics win races, 6-speeds impress high school kids -Save a tree, support your local dragstrip. -"Failure - The Secret To Success, the idea is that you can fail 100 times as long as you can succeed once" -Takeo Fukui columbuscarsandcoffee.net and on Facebook

10-21-2013, 08:43 PM	#3
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: best street/strip 12 bolt diff I have the Eaton in mine and am very happy with it so far. __________________ 82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph

10-21-2013, 10:09 PM	#4
BigDan3131 Registered User Join Date: Jun 2006 Location: Maple Valley, WA Posts: 1,913	Re: best street/strip 12 bolt diff There are a few other questions that need to be answered. First up is how often do you drive this truck? Is it a DD or weekend ride? Do you plan to add more power to it? Street tires or something like the ET Streets? If its anything other than street tires I suggest having Ford ends put on and stronger axles added then the Truetrac or Locker. If its your DD and no more power than what you have with street tires I love my Auburn Pro Series, it hasn't let me down yet. __________________ Custom Painter/Restoration Specialist 1965 GMC 3/4 Ton LB SOLD? 1964 Chevy El Camino in full restoration 1991 Chevy S10 288K+ miles 2nd Owner SOLD 2020 RAM 1500 Warlock

10-22-2013, 01:33 PM	#5
Bad70sbchevy Registered User Join Date: Aug 2009 Location: Newberry,FL Posts: 277	Re: best street/strip 12 bolt diff Thanks everybody for the replies. As of right now, its a weekend driver and occasionally drive it 1-2 times during the week. For now I'm going to "try" and leave her alone since I'm in college now, but after I get out I do plan on adding more power. Right now it has 275/60R15 street tires on the back. I was told when it had 4.11s in it previously it would dead hook at the track, but not at all on the street. __________________ 1970 Chevrolet C-10 w/355sbc 2010 Silverado Daily Driver 1971 Mercedes 280sl project car

10-22-2013, 09:32 PM	#6
bigsnookmaster Senior Member Join Date: Jan 2008 Location: St.Petersburg,Fl Posts: 1,268	Re: best street/strip 12 bolt diff My Auburn Pro Series went south, so I replaced it with a Yukon Trac-Lock race posi. It works very well with no chatter whatsoever! I have a 9" with a Strange nodular center section. I had to do a considerable amount of clearancing in my carrier though. It was a much larger posi. Very nice unit though! .02 __________________ greg http://community.webshots.com/user/68406Stepside

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