would this fit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

greg0380 · 01-03-2005, 05:31 PM

Like my sig says, I've got a 85 1/2 ton 2WD. The rear gear ratio is 2.73 and I want to change it for a 3.23. I located a complete rear with the 3.23 but its out of a 3/4 ton 4WD and maybe a 6 lug wheel (i haven't seen it yet). would this whole thing fit in my truck??

Jonboy · 01-03-2005, 05:54 PM

The axle will bolt up, but it will have 8 lug wheels.

**Captkaos** · 01-04-2005, 07:00 PM

The yoke for the driveshaft will be different too.

piecesparts · 01-04-2005, 07:05 PM

Those items (yoke and axles) can be changed to fit your truck. I put a 12 bolt posi 3/4 ton axle under a truck and we changed the axles to five bolt and the yoke to align with my 1/2 ton. All parts were in the local salvage yard, but the new stuff is available at a reasonable price. If I was going to make a change I would go for a little deeper ratio, at least a 3.42 and possibly a 3.73 to get some low end torgue. I like to be able to pull hard and get a good launch in acceleration.

**Captkaos** · 01-04-2005, 08:20 PM

I believe he is looking for a bolt in application though. BTW, 3/4T trucks never used a 12bolt, they were 14bolts.

01-03-2005, 05:31 PM	#1
greg0380 Registered User Join Date: Dec 2003 Location: CT Posts: 454	would this fit Like my sig says, I've got a 85 1/2 ton 2WD. The rear gear ratio is 2.73 and I want to change it for a 3.23. I located a complete rear with the 3.23 but its out of a 3/4 ton 4WD and maybe a 6 lug wheel (i haven't seen it yet). would this whole thing fit in my truck?? __________________ 1985 GMC Sierra 1500, 1/2 ton, 2WD, LWB, TBI 305 5 speed, 3.42 rear 2007 GMC Sierra 1500, xtended cab, 4X4, flexfuel 5.3L 1999 BMW 528i

01-03-2005, 05:54 PM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	The axle will bolt up, but it will have 8 lug wheels. __________________ 1974 Jimmy- 5.3/4L80e/NP241

01-04-2005, 07:00 PM	#3
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	The yoke for the driveshaft will be different too. __________________ 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

01-04-2005, 08:20 PM	#5
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	I believe he is looking for a bolt in application though. BTW, 3/4T trucks never used a 12bolt, they were 14bolts. __________________ 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

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01-04-2005, 07:05 PM	#4
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Those items (yoke and axles) can be changed to fit your truck. I put a 12 bolt posi 3/4 ton axle under a truck and we changed the axles to five bolt and the yoke to align with my 1/2 ton. All parts were in the local salvage yard, but the new stuff is available at a reasonable price. If I was going to make a change I would go for a little deeper ratio, at least a 3.42 and possibly a 3.73 to get some low end torgue. I like to be able to pull hard and get a good launch in acceleration.



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