Just checked my axle ratio... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

goldwing2000 · 01-26-2005, 09:27 PM

Bought my Blazer back in November but just got it on the road earlier this month. I thought it had the 3.42 axles under it like my '80 K-10 but wasn't positive. It felt seriously under-powered compared to the pick-up but I figured it was just because of the 2" bigger tires.

Boy, was I wrong.

Was at the tire shop today getting new wheels put on, so I took the opportunity to do some axle spinning and check the ratio.

Yep, you guessed it. I'm stuck with the suck-ass GU2 2.73 axles. I'm turning like 1700 rpm on the freeway, according to the ratio charts. It's pretty sad when I'm thinking about swapping in my K-10 3.42s to gain some more power!

Oh well... I guess those will have to tide me over till I find a good D44/14FF 4.10 setup.

Hoods69BadBowTie · 01-27-2005, 01:29 AM

Damn, that suxs. I hope you can get some new axles in soon.
-Later

goldwing2000 · 01-28-2005, 03:45 PM

I'll swap in the 3.42s I have under my truck for now. That will help until I can find a 3/4 or 1-ton setup.

72 CustomCamper · 01-28-2005, 04:48 PM

My neighbor bought an 81 short bed 4x4 on 33's thinking it would tow his new 30' travel trailer with no problems. After the first trip to the mountains he said it didn't have the oomph he wanted. We pulled the covers and found the beloved 2:73's. He decided to go with 4:10's. Made a world of difference but now we don't know how far off the speedo is...

Chuck

GMC AMI · 01-28-2005, 07:00 PM

They have different color speedo gears that go in the auto trannys where the speedo cable screws on. One little bolt and put the proper gear in and screw back together and you should be back to accu. speed.

72 CustomCamper · 01-28-2005, 11:11 PM

Quote:

Originally Posted by Mike Files

They have different color speedo gears that go in the auto trannys where the speedo cable screws on. One little bolt and put the proper gear in and screw back together and you should be back to accu. speed.

He doesn't want to spend the money for that. I gave him the gear reduction unit of the 4 spd I kept from the dualy I trashed out. That helped some but the spedo cable broke and he hasn't driven the truck since replacing it...

Chuck

goldwing2000 · 02-01-2005, 02:19 PM

The different color gears can only help you so much before youhave to go to a reduction unit. I know mine is WAY off right now, so I did some research to find out just how much. Found this web site:

http://www.speedometershop.com/ratio.html

That's about as accurate as you can get!

Gyva · 02-01-2005, 09:52 PM

ring and pinions $125.00 any gear you want lol..... well almost lol...

goldwing2000 · 02-02-2005, 11:00 AM

Quote:

Originally Posted by Gyva

ring and pinions $125.00 any gear you want lol..... well almost lol...

Plus install kits.
Plus hours of labor.
Plus I'm stuck with 1/2-ton running gear.

That's my last resort. I'm looking for an M1008 for now.

01-26-2005, 09:27 PM	#1
goldwing2000 Registered User Join Date: Nov 2004 Location: SE Michigan Posts: 73	Just checked my axle ratio... Bought my Blazer back in November but just got it on the road earlier this month. I thought it had the 3.42 axles under it like my '80 K-10 but wasn't positive. It felt seriously under-powered compared to the pick-up but I figured it was just because of the 2" bigger tires. Boy, was I wrong. Was at the tire shop today getting new wheels put on, so I took the opportunity to do some axle spinning and check the ratio. Yep, you guessed it. I'm stuck with the suck-ass GU2 2.73 axles. I'm turning like 1700 rpm on the freeway, according to the ratio charts. It's pretty sad when I'm thinking about swapping in my K-10 3.42s to gain some more power! Oh well... I guess those will have to tide me over till I find a good D44/14FF 4.10 setup. __________________ ~Kane USMC NRA GWRRA AMA Remember: Except for Slavery, Fascism, Nazism, Totalitarianism and Theocracies, WAR HAS NEVER SOLVED ANYTHING!

01-27-2005, 01:29 AM	#2
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Damn, that suxs. I hope you can get some new axles in soon. -Later __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

01-28-2005, 03:45 PM	#3
goldwing2000 Registered User Join Date: Nov 2004 Location: SE Michigan Posts: 73	I'll swap in the 3.42s I have under my truck for now. That will help until I can find a 3/4 or 1-ton setup. __________________ ~Kane USMC NRA GWRRA AMA Remember: Except for Slavery, Fascism, Nazism, Totalitarianism and Theocracies, WAR HAS NEVER SOLVED ANYTHING!

01-28-2005, 04:48 PM	#4
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,368	My neighbor bought an 81 short bed 4x4 on 33's thinking it would tow his new 30' travel trailer with no problems. After the first trip to the mountains he said it didn't have the oomph he wanted. We pulled the covers and found the beloved 2:73's. He decided to go with 4:10's. Made a world of difference but now we don't know how far off the speedo is... Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

01-28-2005, 07:00 PM	#5
GMC AMI Registered User Join Date: Apr 2004 Location: The Other Maine! Posts: 2,236	They have different color speedo gears that go in the auto trannys where the speedo cable screws on. One little bolt and put the proper gear in and screw back together and you should be back to accu. speed. __________________ 1968 Chevy 4x4 307 4 speed

02-01-2005, 02:19 PM	#7
goldwing2000 Registered User Join Date: Nov 2004 Location: SE Michigan Posts: 73	The different color gears can only help you so much before youhave to go to a reduction unit. I know mine is WAY off right now, so I did some research to find out just how much. Found this web site: http://www.speedometershop.com/ratio.html That's about as accurate as you can get! __________________ ~Kane USMC NRA GWRRA AMA Remember: Except for Slavery, Fascism, Nazism, Totalitarianism and Theocracies, WAR HAS NEVER SOLVED ANYTHING!

02-01-2005, 09:52 PM	#8
Gyva Registered User Join Date: Jan 2005 Location: Mountain Home Idaho Posts: 544	ring and pinions $125.00 any gear you want lol..... well almost lol...

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