No truetrac / 3.42 combo! What now? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Pkh66 · 11-17-2011, 01:00 AM

Truetrac does not offer in a 3.42 carrier. 3.73 up is all.

Hesitant of 3.73's due to 80% highway driving

Hesitant of a posi as the locker in it is broke now

468, th400 and 29x20x15 mickeys.

What to do?
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**70cst** · 11-17-2011, 02:11 AM

ttt

**special-K** · 11-17-2011, 07:36 AM

www.auburngear.com

Your old posi probably broke from improper maintenance. But,the Auburn is a stouter design I think.

cdowns · 11-17-2011, 07:51 AM

how old is the posi you have now that is broken?? if its a 40year old piece? i'd think it gave great service over that span

Pkh66 · 11-17-2011, 07:54 AM

Quote:

Originally Posted by cdowns

how old is the posi you have now that is broken?? if its a 40year old piece? i'd think it gave great service over that span

No idea but it is not a posi. It is a locker. It has little pins on springs and one of the pins snapped. It's been broke since I've owned the truck. Locked up solid as the piece is stuck in there.
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**special-K** · 11-17-2011, 08:50 AM

This is for a 12-bolt 30 spine? I found a listing for 3.73-down carrier:
http://www.currieenterprises.com/ces...E.aspx?id=3337

Pkh66 · 11-17-2011, 08:59 AM

Yes and correct but thats for a car
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68Stepbed · 11-17-2011, 09:11 AM

What you have now sounds like a Gov-lock. They are famous for breaking because they use centrifugal weights to engage, or lock.

I would run an Eaton LSD. They're very durable and rebuildable. The Auburn LSD's are great units, but they're not rebuildable
http://www.ringpinion.com/b2c/Produc...and=Eaton_Posi

Pkh66 · 11-17-2011, 11:14 PM

Ttt
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chevytruckluver · 11-18-2011, 12:47 AM

Quote:

Originally Posted by 68Stepbed

What you have now sounds like a Gov-lock. They are famous for breaking because they use centrifugal weights to engage, or lock.

I would run an Eaton LSD. They're very durable and rebuildable. The Auburn LSD's are great units, but they're not rebuildable
http://www.ringpinion.com/b2c/Produc...and=Eaton_Posi

Agree...very much so

Pkh66 · 11-18-2011, 07:24 AM

I'm wondering if 3.73's will be too much but I am leaning that way to get the true trac.

Oh yea, the busted LSD is a powertrax. One of the pins is jammed in there.
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Pkh66 · 11-18-2011, 07:49 AM

So which of the following gears do I get? 3 or 4 series carrier with a truetrac?

http://www.summitracing.com/parts/RMG-4902801/

http://www.summitracing.com/parts/RMG-4900721/
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hjewell2 · 11-18-2011, 08:10 AM

Give DTS a call they will get you you need plus more and at a fair price.
browse through the web site. they even carry the x-tra thick gears for different series carriers to fit each other. example 3.08 gear fit series 4 carrier.

www.drivetrainspecialists.com

68Stepbed · 11-18-2011, 09:10 AM

I had a 3.73 gear with 28" and 29" tires. It was ok, but trying to drive 70mph on the interstate wasn't alot of fun. I finally switched to a 3.07 this spring. I lost some bottom end, but it's great to be able to drive in the fast lane with other traffic. I personally wouldn't go 3.73's if you do alot of highway driving. Unless, of course, you don't mind staying at 60 in the slow lane the whole time.

**Already Gone** · 11-18-2011, 11:07 AM

Quote:

Originally Posted by hjewell2

Give DTS a call they will get you you need plus more and at a fair price.
browse through the web site. they even carry the x-tra thick gears for different series carriers to fit each other. example 3.08 gear fit series 4 carrier.

www.drivetrainspecialists.com

I agree, I called DTS a while ago asking for a quote on a 12 bolt with Tru-Trac and 3:42's and the saddles ready to bolt in. They quoted me 2600.00 & shipping with 30/31 ( I can't remember which) spline axles.

http://www.drivetrainspecialists.com/index.html

Pkh66 · 11-18-2011, 07:11 PM

Quote:

Originally Posted by 68Stepbed

I had a 3.73 gear with 28" and 29" tires. It was ok, but trying to drive 70mph on the interstate wasn't alot of fun. I finally switched to a 3.07 this spring. I lost some bottom end, but it's great to be able to drive in the fast lane with other traffic. I personally wouldn't go 3.73's if you do alot of highway driving. Unless, of course, you don't mind staying at 60 in the slow lane the whole time.

Wondering what type of rpm's you were seeing. I've rsn the numbers and I am using a calculator stating 3500 at 80. Doesn't seem to bad As I'm probably not even getting positive lock up at 80 now with 3.08's and a 3k stall. Tires measure 28.5"
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Pkh66 · 11-18-2011, 07:11 PM

The 468 seems pretty built as I don't shift til 6k.
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usmcchevy · 11-18-2011, 11:45 PM

Quote:

Originally Posted by Pkh66

Oh yea, the busted LSD is a powertrax. One of the pins is jammed in there.
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Powertrax is far from the strongest locker out there. Most cases a different area of a 12 bolt will give up before a Eaton posi will..

Pkh66 · 11-19-2011, 08:28 AM

Went with truetrac and 373's. Should keep those 15" wide mickeys going.
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Husker · 11-19-2011, 09:31 PM

If you go a little taller on your tires it will drop ratio a bit. when you need new tires of course. I am running 373's in my Jeep with 33's does good on highway. Went with 373's in My 70 GMC4x4 with 33's also.
Ron
Ron

Pkh66 · 11-19-2011, 10:03 PM

Yep. I'm a 2 wheeler though on bags. Tow vehicle has 35"s though. Thanks for the input. Other set of wheels has 31".
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SB'72 · 04-19-2012, 09:45 AM

Quote:

Originally Posted by Pkh66

Went with truetrac and 373's. Should keep those 15" wide mickeys going.
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In the process of doing a little research, and came across your thread. I was interested in how you like your decision on the 3.73 gears/Tru Trac?

Thanks.

Pkh66 · 04-19-2012, 11:04 PM

Like it. I have a three speed so it runs over 3k at 75 bbc.
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SB'72 · 04-20-2012, 10:26 AM

I probably will go with that as well, my tires are 28.5" tall, and will probably be just over 3K @ 70-75.

Thanks

11-17-2011, 01:00 AM	#1
Pkh66 Registered User Join Date: Apr 2011 Location: Dallas Posts: 94	No truetrac / 3.42 combo! What now? Truetrac does not offer in a 3.42 carrier. 3.73 up is all. Hesitant of 3.73's due to 80% highway driving Hesitant of a posi as the locker in it is broke now 468, th400 and 29x20x15 mickeys. What to do? Posted via Mobile Device

11-17-2011, 02:11 AM	#2
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,377	Re: No truetrac / 3.42 combo! What now? ttt __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

11-17-2011, 07:36 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: No truetrac / 3.42 combo! What now? www.auburngear.com Your old posi probably broke from improper maintenance. But,the Auburn is a stouter design I think. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

11-17-2011, 07:51 AM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: No truetrac / 3.42 combo! What now? how old is the posi you have now that is broken?? if its a 40year old piece? i'd think it gave great service over that span __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

11-17-2011, 08:50 AM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: No truetrac / 3.42 combo! What now? This is for a 12-bolt 30 spine? I found a listing for 3.73-down carrier: http://www.currieenterprises.com/ces...E.aspx?id=3337 __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

11-17-2011, 08:59 AM	#7
Pkh66 Registered User Join Date: Apr 2011 Location: Dallas Posts: 94	Re: No truetrac / 3.42 combo! What now? Yes and correct but thats for a car Posted via Mobile Device

11-17-2011, 09:11 AM	#8
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: No truetrac / 3.42 combo! What now? What you have now sounds like a Gov-lock. They are famous for breaking because they use centrifugal weights to engage, or lock. I would run an Eaton LSD. They're very durable and rebuildable. The Auburn LSD's are great units, but they're not rebuildable http://www.ringpinion.com/b2c/Produc...and=Eaton_Posi __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

11-17-2011, 11:14 PM	#9
Pkh66 Registered User Join Date: Apr 2011 Location: Dallas Posts: 94	Re: No truetrac / 3.42 combo! What now? Ttt Posted via Mobile Device

11-18-2011, 07:24 AM	#11
Pkh66 Registered User Join Date: Apr 2011 Location: Dallas Posts: 94	Re: No truetrac / 3.42 combo! What now? I'm wondering if 3.73's will be too much but I am leaning that way to get the true trac. Oh yea, the busted LSD is a powertrax. One of the pins is jammed in there. Posted via Mobile Device

11-18-2011, 07:49 AM	#12
Pkh66 Registered User Join Date: Apr 2011 Location: Dallas Posts: 94	Re: No truetrac / 3.42 combo! What now? So which of the following gears do I get? 3 or 4 series carrier with a truetrac? http://www.summitracing.com/parts/RMG-4902801/ http://www.summitracing.com/parts/RMG-4900721/ Posted via Mobile Device

11-18-2011, 08:10 AM	#13
hjewell2 Registered User Join Date: May 2011 Location: mich Posts: 656	Re: No truetrac / 3.42 combo! What now? Give DTS a call they will get you you need plus more and at a fair price. browse through the web site. they even carry the x-tra thick gears for different series carriers to fit each other. example 3.08 gear fit series 4 carrier. www.drivetrainspecialists.com

11-18-2011, 09:10 AM	#14
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: No truetrac / 3.42 combo! What now? I had a 3.73 gear with 28" and 29" tires. It was ok, but trying to drive 70mph on the interstate wasn't alot of fun. I finally switched to a 3.07 this spring. I lost some bottom end, but it's great to be able to drive in the fast lane with other traffic. I personally wouldn't go 3.73's if you do alot of highway driving. Unless, of course, you don't mind staying at 60 in the slow lane the whole time. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

11-18-2011, 07:11 PM	#17
Pkh66 Registered User Join Date: Apr 2011 Location: Dallas Posts: 94	Re: No truetrac / 3.42 combo! What now? The 468 seems pretty built as I don't shift til 6k. Posted via Mobile Device

11-19-2011, 08:28 AM	#19
Pkh66 Registered User Join Date: Apr 2011 Location: Dallas Posts: 94	Re: No truetrac / 3.42 combo! What now? Went with truetrac and 373's. Should keep those 15" wide mickeys going. Posted via Mobile Device

11-19-2011, 09:31 PM	#20
Husker Registered User Join Date: Dec 1999 Location: Mid NE USA Posts: 2,222	Re: No truetrac / 3.42 combo! What now? If you go a little taller on your tires it will drop ratio a bit. when you need new tires of course. I am running 373's in my Jeep with 33's does good on highway. Went with 373's in My 70 GMC4x4 with 33's also. Ron Ron __________________ Member #111 68 C-10 Daily Driver 70 4x4 Project 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson



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11-19-2011, 10:03 PM	#21
Pkh66 Registered User Join Date: Apr 2011 Location: Dallas Posts: 94	Re: No truetrac / 3.42 combo! What now? Yep. I'm a 2 wheeler though on bags. Tow vehicle has 35"s though. Thanks for the input. Other set of wheels has 31". Posted via Mobile Device

04-19-2012, 11:04 PM	#23
Pkh66 Registered User Join Date: Apr 2011 Location: Dallas Posts: 94	Re: No truetrac / 3.42 combo! What now? Like it. I have a three speed so it runs over 3k at 75 bbc. Posted via Mobile Device

04-20-2012, 10:26 AM	#24
SB'72 Registered User Join Date: Apr 2008 Location: Plano, TX Posts: 49	Re: No truetrac / 3.42 combo! What now? I probably will go with that as well, my tires are 28.5" tall, and will probably be just over 3K @ 70-75. Thanks

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