I Want Posi Traction!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevyguy111786 · 10-08-2004, 11:06 PM

yeah that's about it, i want a posi. What's a good unit to get? Where can i get one....would rather buy a good used one due to cost, but either is fine. I have a 78 chevy 1/2 ton, originally a Big 10 but now it has a mild 350. don't know the gear ratio, but was told by PO is was 3:42. any idears?

ocbaud · 10-08-2004, 11:08 PM

i left two 20' marks the other night leaving my parking lot at work

i came back the next day and was like..." i left two marks???

"

haha

to bad that never happens usually

Chevyguy111786 · 10-08-2004, 11:14 PM

haha! i can leave two....when it's raining...DOH!...it's not real important, but somethin i'd like to have....but only for the right price type of deal.

81shavedtrk · 10-08-2004, 11:51 PM

12 bolt or 10 bolt?

86 Red_Bowtie · 10-09-2004, 11:25 AM

I have a Eaton posi with 3:73 gears in my truck and it ran about $400 for the unit.I like it beats having those one legged wonders.

Chevyguy111786 · 10-09-2004, 11:37 AM

12 bolt..forgot that part, i think anyway, guess i need to check gear ratios and bolt pattern...what's the easiest way to check gear ratio?

86-C10-V6 · 10-09-2004, 11:59 AM

the ratio is not that important, since you will take the ring gear from your existing differential and bolt it on the new posi differential.
For an all around posi unit, I think the Eaton posi is the best thing going. Doesn't create absolute lockup since it is clutch operated but is less noisy and has a proven reliability record. It's also rebuildable which is its advantage over the Auburn Gear differential.
My Auburn has held up well, but I don't have enough HP to really hurt it.
There is a lot of internet sites with info on Posi differentials. Just google it up and do some research.
If current differential is open, which it sounds like it is, something like the "lock-rite" is much easier and most likely cheaper to install.

boraxman · 10-09-2004, 04:36 PM

Get posi. It was the first thing I did to my truck. I went w/ Eaton kit that a regular seller had/has on Ebay, cost like 650 included posi, choice of gears(I did 3.42), bearings, seals, etc. All new.

I also had new axles installed as I was converting from 6 lug to 5. Total cost about $1250 with me pulling the rear out and putting it back. Love leaving 2 black stripes

STEPSIDE_84 · 10-10-2004, 07:14 PM

salvage yard in nh sells original gm posi(limited slip) for $125

used ones on ebay are usaully around 150+ship

SanitysBane · 10-10-2004, 11:47 PM

if i were you, forget a posi, they have clutches that ware out, plus you have to put in a special aditive in your rearend grease, i would go with a detroit locker for the fact that it doesn't ware out, and no special rearend grease is needed.

Justins76 · 10-16-2004, 04:01 AM

I did alot of research awhile back on posi's. Easton seemed to be the best since it is rebuildable unlike the Auburns.

10-08-2004, 11:06 PM	#1
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	I Want Posi Traction!!! yeah that's about it, i want a posi. What's a good unit to get? Where can i get one....would rather buy a good used one due to cost, but either is fine. I have a 78 chevy 1/2 ton, originally a Big 10 but now it has a mild 350. don't know the gear ratio, but was told by PO is was 3:42. any idears?

10-08-2004, 11:51 PM	#4
81shavedtrk Registered User Join Date: Jul 2004 Location: El Dorado, KS Posts: 94	12 bolt or 10 bolt? __________________ 11.98 @112mph Stock suspension and little tires.

10-09-2004, 11:25 AM	#5
86 Red_Bowtie Registered User Join Date: Nov 2003 Location: South Wichita,KS Posts: 698	I have a Eaton posi with 3:73 gears in my truck and it ran about $400 for the unit.I like it beats having those one legged wonders. __________________ Sean Midwest All Truck Nationals, Riverside, MO - 2008 - 2015

10-09-2004, 11:59 AM	#7
86-C10-V6 Shadetree Mechanic Join Date: Oct 2002 Location: Youngsville, NC Posts: 100	Unless you want to change the Ratio the ratio is not that important, since you will take the ring gear from your existing differential and bolt it on the new posi differential. For an all around posi unit, I think the Eaton posi is the best thing going. Doesn't create absolute lockup since it is clutch operated but is less noisy and has a proven reliability record. It's also rebuildable which is its advantage over the Auburn Gear differential. My Auburn has held up well, but I don't have enough HP to really hurt it. There is a lot of internet sites with info on Posi differentials. Just google it up and do some research. If current differential is open, which it sounds like it is, something like the "lock-rite" is much easier and most likely cheaper to install. __________________ Dave M. (Hacksaw) 86 C10 Scottsdale LWB, 4.3L, Edelbrock 1904, K&N, 700R4, 3.08 Auburn Performance 89 GMC S-15 Extended Cab 4x4, 4.3L, FI 98 K1500 Xcab, 5.7L, 3.43 Gov-Lok

10-09-2004, 04:36 PM	#8
boraxman Keepin an eye out Join Date: Feb 2003 Location: So.Cal Posts: 3,920	Get posi. It was the first thing I did to my truck. I went w/ Eaton kit that a regular seller had/has on Ebay, cost like 650 included posi, choice of gears(I did 3.42), bearings, seals, etc. All new. I also had new axles installed as I was converting from 6 lug to 5. Total cost about $1250 with me pulling the rear out and putting it back. Love leaving 2 black stripes __________________ 1970 Chevy C10 SWB 5.3 1996 Toyota Tacoma SR5 4x4 2007 Vespa GTS 250 Scooter ZIP 91351 Last edited by boraxman; 10-09-2004 at 05:52 PM.

10-08-2004, 11:08 PM	#2
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	i left two 20' marks the other night leaving my parking lot at work i came back the next day and was like..." i left two marks??? " haha to bad that never happens usually

10-08-2004, 11:14 PM	#3
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	haha! i can leave two....when it's raining...DOH!...it's not real important, but somethin i'd like to have....but only for the right price type of deal.

10-09-2004, 11:37 AM	#6
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	12 bolt..forgot that part, i think anyway, guess i need to check gear ratios and bolt pattern...what's the easiest way to check gear ratio?

10-10-2004, 07:14 PM	#9
STEPSIDE_84 Registered User Join Date: Dec 2003 Location: ROCHESTER, NH Posts: 29	salvage yard in nh sells original gm posi(limited slip) for $125 used ones on ebay are usaully around 150+ship

10-10-2004, 11:47 PM	#10
SanitysBane Registered User Join Date: May 2004 Location: Lubbock, Texas Posts: 2,121	if i were you, forget a posi, they have clutches that ware out, plus you have to put in a special aditive in your rearend grease, i would go with a detroit locker for the fact that it doesn't ware out, and no special rearend grease is needed. __________________ '96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer

10-16-2004, 04:01 AM	#11
Justins76 OutOfMyMind & I'llNeverKnowWhy Join Date: Apr 2004 Location: Another world, some other time Posts: 672	I did alot of research awhile back on posi's. Easton seemed to be the best since it is rebuildable unlike the Auburns. __________________ -Justin-Out of my mind and I'll never know why 1976 Chevrolet Silverado C10 350 4bbl / TH350 Big10 longbed 1986 Pontiac Firebird T-Top 5.0L TPI 700R4 WS6 1992 Pontiac Firebird T-Top 5.0L TBI 700R4 My cardomain page I don't like to save, it's more fun to spend!!

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