HO72 in Texas 4.88 Gears - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MrBeast · 10-02-2008, 11:27 AM

I have for sale a HO72 out of my 1 ton Dually, The axle is in perfect condition other than needing brakes, I am swapping in a 14 Bolt, Located in Corpus Christi, Tx.

lowriden58 · 10-02-2008, 12:28 PM

need to post a price

MrBeast · 10-02-2008, 01:21 PM

I would like to get 300.00 out of it, but im open to offers.

1967k30 · 10-02-2008, 02:19 PM

If you can confirm it has 4.88's I'd be interested. Never seen a 4.88. 4.10,4.56 and 5.14's are the norm.

MrBeast · 10-02-2008, 02:47 PM

Quote:

Originally Posted by 1967k30

If you can confirm it has 4.88's I'd be interested. Never seen a 4.88. 4.10,4.56 and 5.14's are the norm.

Using a Digital Tach to verify Engine RPM and a GPS my speed, with a 235/85R16 tire, running at 65 MPH with the 4.88 rear, .73 over drive on the NV4500, the truck turns about 2445 RPM, By the numbers a 235/85R16 is 31.73" tall, and will turn over 635.6165896 revolutions per mile, to travel at 65 mph this will require that the tire make 41315.07832 revolutions per hour. Divided by 60 minutes this is 688.5846387 rpm. Take that x. 4.88 x.73 and you get 2453 RPM at the engine. So I am fairly certian that it is a 4.88

Jtrux · 10-02-2008, 06:04 PM

Quote:

Originally Posted by MrBeast

Using a Digital Tach to verify Engine RPM and a GPS my speed, with a 235/85R16 tire, running at 65 MPH with the 4.88 rear, .73 over drive on the NV4500, the truck turns about 2445 RPM, By the numbers a 235/85R16 is 31.73" tall, and will turn over 635.6165896 revolutions per mile, to travel at 65 mph this will require that the tire make 41315.07832 revolutions per hour. Divided by 60 minutes this is 688.5846387 rpm. Take that x. 4.88 x.73 and you get 2453 RPM at the engine. So I am fairly certian that it is a 4.88

Hmmmmm, now i'm dizzy.

newbraunie · 10-02-2008, 11:04 PM

Quote:

Originally Posted by MrBeast

Using a Digital Tach to verify Engine RPM and a GPS my speed, with a 235/85R16 tire, running at 65 MPH with the 4.88 rear, .73 over drive on the NV4500, the truck turns about 2445 RPM, By the numbers a 235/85R16 is 31.73" tall, and will turn over 635.6165896 revolutions per mile, to travel at 65 mph this will require that the tire make 41315.07832 revolutions per hour. Divided by 60 minutes this is 688.5846387 rpm. Take that x. 4.88 x.73 and you get 2453 RPM at the engine. So I am fairly certian that it is a 4.88

Shaazzzam!! What a way to figure out gear ratio. I am impressed.

10-02-2008, 11:27 AM	#1
MrBeast high-Tech Red Neck Join Date: Feb 2008 Location: Livingston, MT/On my boat WA/BC/AK Posts: 2,294	HO72 in Texas 4.88 Gears I have for sale a HO72 out of my 1 ton Dually, The axle is in perfect condition other than needing brakes, I am swapping in a 14 Bolt, Located in Corpus Christi, Tx. __________________ "He used to be a pretty nice feller, now he's a welder!"

10-02-2008, 12:28 PM	#2
lowriden58 Registered User Join Date: Jan 2008 Location: Chesapeake Beach, MD Posts: 812	Re: HO72 in Texas 4.88 Gears need to post a price __________________ 71 cheyenne lwb 300rwhp best 1/4 time so far 12.8 @103 http://i195.photobucket.com/albums/z...en58/001-2.jpg

10-02-2008, 01:21 PM	#3
MrBeast high-Tech Red Neck Join Date: Feb 2008 Location: Livingston, MT/On my boat WA/BC/AK Posts: 2,294	Re: HO72 in Texas 4.88 Gears I would like to get 300.00 out of it, but im open to offers. __________________ "He used to be a pretty nice feller, now he's a welder!"

10-02-2008, 02:19 PM	#4
1967k30 Senior Member Join Date: Sep 2005 Location: NE Posts: 363	Re: HO72 in Texas 4.88 Gears If you can confirm it has 4.88's I'd be interested. Never seen a 4.88. 4.10,4.56 and 5.14's are the norm. __________________ 01 2500 Duramax,6spd,4x4,Not stock. Estimated 550rwhp/1100rwfp on fuel only. 03 3500 Duramax,6spd,4x4,Pac-Brake,not stock Estimated 500rwhp/1000rwfp fuel only 67 K10 in many pieces Little Brothers truck 67 K20 Cummins 12V/NV4500/205, D60/Eaton w/ Detroit,37" Xterrains,crossover steering, Future plans,Twins and lots of fuel.



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