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.

1967k30 · 10-02-2008, 10:07 PM

Is it pulled yet? If so there are numbers on the side of the ring gear.

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.

brossow · 10-02-2008, 11:09 PM

Quote:

Originally Posted by 1967k30

Is it pulled yet? If so there are numbers on the side of the ring gear.

Where's the fun in that?

MrBeast · 10-03-2008, 07:54 AM

Quote:

Originally Posted by 1967k30

Is it pulled yet? If so there are numbers on the side of the ring gear.

It it still in the truck, I am still driving it, I will be pulling it in 2-3 weeks, I am going to dallas next week to get my 14B, and as soon as I can I will be installing it.

MrBeast · 10-03-2008, 07:57 AM

Quote:

Originally Posted by newbraunie

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

And to think, I don't even have a highschool diploma!

pumpkin · 10-03-2008, 09:47 AM

I think,,,,maybe the clutch has a little bit of slip, or the tires. I have seen a lot of eatons, and never seen 4.88's. I would bet they are 4.56, which seems to be the most common gears available in the eatons.

MrBeast · 10-03-2008, 09:52 AM

Quote:

Originally Posted by pumpkin

I think,,,,maybe the clutch has a little bit of slip, or the tires. I have seen a lot of eatons, and never seen 4.88's. I would bet they are 4.56, which seems to be the most common gears available in the eatons.

The Clutch is a brand new Center force Dual Friction. Less than 5000 miles on it. I am absolutely sure it is a 4.88

1967k30 · 10-03-2008, 01:06 PM

I too have been through a ton of Eatons and never seen 4.88's but I have heard about 4.88's. I always wanted one and that is why my hopes are up
H110's had 4.88's though.
This Eaton does have the removable rear cover right?

Quote:

Originally Posted by pumpkin

I think,,,,maybe the clutch has a little bit of slip, or the tires. I have seen a lot of eatons, and never seen 4.88's. I would bet they are 4.56, which seems to be the most common gears available in the eatons.

MrBeast · 10-03-2008, 01:59 PM

Quote:

Originally Posted by 1967k30

I too have been through a ton of Eatons and never seen 4.88's but I have heard about 4.88's. I always wanted one and that is why my hopes are up
H110's had 4.88's though.
This Eaton does have the removable rear cover right?

It is a HO72 with out a doubt, removable cover, drop out center section, OE for a 72 1 ton dually C/30, I have had 5 of these axles, I know good and well what they are. If I could find a set of 4.56'es or 4.11's for it id keep it.

Chris H · 10-03-2008, 02:15 PM

Quote:

Originally Posted by MrBeast

If I could find a set of 4.56'es or 4.11's for it id keep it.

I have a 4.56 center section with factory No-Spin if you are looking?
$400 plus shipping via DHL (140 pounds, 24x18x18 from 55944).

MrBeast · 10-03-2008, 02:25 PM

Quote:

Originally Posted by Chris H

I have a 4.56 center section with factory No-Spin if you are looking?
$400 plus shipping via DHL (140 pounds, 24x18x18 from 55944).

Can you get me a quote on shipping? 78460

Chris H · 10-03-2008, 02:37 PM

Quote:

Originally Posted by MrBeast

Can you get me a quote on shipping? 78460

Looks like about $90 via DHL... 4 day ground service from MN to TX.

I can take paypal, and can have it shipped out early next week.

MrBeast · 10-03-2008, 02:53 PM

Quote:

Originally Posted by Chris H

Looks like about $90 via DHL... 4 day ground service from MN to TX.

I can take paypal, and can have it shipped out early next week.

I just spent a whole bunch of money buying a dana 60, a 14 bolt and a seat for my truck, I wouldnt be able to pick it up for a month or so. If you still have it then, and I havent sold the axle I will take it off your hands.

1967k30 · 10-03-2008, 10:26 PM

Keep me posted when it gets pulled.

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.

10-02-2008, 10:07 PM	#7
1967k30 Senior Member Join Date: Sep 2005 Location: NE Posts: 363	Re: HO72 in Texas 4.88 Gears Is it pulled yet? If so there are numbers on the side of the ring gear. __________________ 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.

10-03-2008, 09:47 AM	#12
pumpkin Registered User Join Date: Apr 2006 Location: East Sooke B.C. Canada Posts: 543	Re: HO72 in Texas 4.88 Gears I think,,,,maybe the clutch has a little bit of slip, or the tires. I have seen a lot of eatons, and never seen 4.88's. I would bet they are 4.56, which seems to be the most common gears available in the eatons.

10-03-2008, 10:26 PM	#20
1967k30 Senior Member Join Date: Sep 2005 Location: NE Posts: 363	Re: HO72 in Texas 4.88 Gears Keep me posted when it gets pulled. __________________ 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.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.