posi - The 1947 - Present Chevrolet & GMC Truck Message Board Network

low 84 · 02-10-2004, 12:33 PM

does a posi replace the carrier in the rear end or does it just attach to it.

NeCrOmAnCeR · 02-10-2004, 12:58 PM

Yes, a posi replaces the carrier. You're ring gear bolts to the posi unit just like it did to the carrier. All the other parts contained in the carrier are removed as well.

Mike

low 84 · 02-10-2004, 02:56 PM

so is there a 3 and 4 series posi? or just one posi and 3 and 4 series rings will both attach?

**Captkaos** · 02-10-2004, 05:00 PM

There are 3 and 4 series carriers regardless of type.

low 84 · 02-10-2004, 07:05 PM

ok, last question. if i buy a 4 series posi and 4 series R&P that is all i need to change my 12 bolt to 4 series if it was originaly 3 series open 3.07, correct? like there aren't any other parts that are different that i must change?

**Captkaos** · 02-10-2004, 07:28 PM

sure it is your last question..

Yes, when your order the gears and the differential (carrier) that will be all you need. They will(should) match your gears with the carrier.

The differential (carrier) is different due to the size of the pinion getting smaller/larger base on the gear change. A 4.10:1 ratio has a MUCH smaller pinion gear diameter than a 3.07:1 ratio, so the carrier flange that the ring gear bolts to is posistioned closer to the centerline of the pinion to make up this difference.

low 84 · 02-10-2004, 07:29 PM

02-10-2004, 12:33 PM	#1
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	posi does a posi replace the carrier in the rear end or does it just attach to it. __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

02-10-2004, 02:56 PM	#3
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	so is there a 3 and 4 series posi? or just one posi and 3 and 4 series rings will both attach? __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

02-10-2004, 05:00 PM	#4
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	There are 3 and 4 series carriers regardless of type. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

02-10-2004, 07:05 PM	#5
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	ok, last question. if i buy a 4 series posi and 4 series R&P that is all i need to change my 12 bolt to 4 series if it was originaly 3 series open 3.07, correct? like there aren't any other parts that are different that i must change? __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

02-10-2004, 07:28 PM	#6
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	sure it is your last question.. Yes, when your order the gears and the differential (carrier) that will be all you need. They will(should) match your gears with the carrier. The differential (carrier) is different due to the size of the pinion getting smaller/larger base on the gear change. A 4.10:1 ratio has a MUCH smaller pinion gear diameter than a 3.07:1 ratio, so the carrier flange that the ring gear bolts to is posistioned closer to the centerline of the pinion to make up this difference. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

02-10-2004, 12:58 PM	#2
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	Yes, a posi replaces the carrier. You're ring gear bolts to the posi unit just like it did to the carrier. All the other parts contained in the carrier are removed as well. Mike

02-10-2004, 07:29 PM	#7
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	__________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

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