Wut Kind Of gears Does my 71 have - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71Longbed · 08-30-2004, 11:12 AM

I wanted to know which kind of rear end gears i have my vins is as follows
CE141Z618948 and i think my model number is CE1C934 can some one help or poit me to good site

1971LT1SWBPOSI373 · 08-30-2004, 02:35 PM

The VIN means nothing in this instance. Crawl under your truck and there should be a metal tag on the right side of your differential housing cover provided somebody hasn't removel it and thrown it away. Clean it off and read the gear ratio. Otherwise you can jack it up and spin the rear wheel 1 revolution and count the number of turns the yoke makes. Or you can remove the differential cover and count the ring teeth and the pinion teeth. divide pinion by ring gear = gear ratio. That should get you squared away.

Longhorn Man · 08-30-2004, 03:08 PM

From your Vin, we can tell that it is a 71 1/2 ton with a V-8...let us know what engine and tranny it has, and if there is anything listed in the glove box, and we can tell you what it is supposed to have in it. If you know your RPM's at 60 MPH, we can use that info too.

However, popping off the diff cover and count the teeth on the drive gear, and then divide that by the number of teeth on the driven gear (or vise-versa...I always get those two confused) and that'll be your gear ratio. You'll be looking for a number something like 3.07 , 3.73, 4.10...ect. (those are the offered gears in a 1/2 ton in 71)
I say it is a good idea becouse you'll be draining the gear oil, which was probably neer chainged...33 year old oil doesn't do much good.

71Longbed · 08-30-2004, 03:20 PM

My 71 cheyenne came with lots of options as i have been able to tell in the glove box it had this number under modle i dont know if that is correct or not Ce1c934 the truck has this list in the glove box of options
bucket seats
Front stabalizer
hydro brake booster
turbo hydromatic
chrome hub caps
custom sports truck
olive bucket vinyl trim
tinted glass
belt molding
heavy rear spring
350 v8
power steering
amp oil temp gauge
white and medium olive those are the listed options it has disk brakes also

Longhorn Man · 08-30-2004, 03:55 PM

IF it is original and the rear or just the gear set has never been removed for another gear ration...then you should have a 3.07. This should put your RPM's at 60MPH in the neighborhood of 2500 or so. The pic shows mine with the 3.07 gears, and I have 28 inch tall tires, which can sped things up or slow them down.

08-30-2004, 11:12 AM	#1
71Longbed Not Mine But A beauty Join Date: Aug 2004 Location: Southern CaL Posts: 368	Wut Kind Of gears Does my 71 have I wanted to know which kind of rear end gears i have my vins is as follows CE141Z618948 and i think my model number is CE1C934 can some one help or poit me to good site

08-30-2004, 02:35 PM	#2
1971LT1SWBPOSI373 Registered User Join Date: Mar 2002 Location: Springfield, VA Posts: 460	re The VIN means nothing in this instance. Crawl under your truck and there should be a metal tag on the right side of your differential housing cover provided somebody hasn't removel it and thrown it away. Clean it off and read the gear ratio. Otherwise you can jack it up and spin the rear wheel 1 revolution and count the number of turns the yoke makes. Or you can remove the differential cover and count the ring teeth and the pinion teeth. divide pinion by ring gear = gear ratio. That should get you squared away. __________________ 1971 Shortbed 350/350 w/ Posi-traction 3:73's 1996 Chevy Silverado TJ in Springfield, Virginia Likes old Chevy trucks Drinks Miller MGD

08-30-2004, 03:55 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	IF it is original and the rear or just the gear set has never been removed for another gear ration...then you should have a 3.07. This should put your RPM's at 60MPH in the neighborhood of 2500 or so. The pic shows mine with the 3.07 gears, and I have 28 inch tall tires, which can sped things up or slow them down. Attached Images

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08-30-2004, 03:08 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	From your Vin, we can tell that it is a 71 1/2 ton with a V-8...let us know what engine and tranny it has, and if there is anything listed in the glove box, and we can tell you what it is supposed to have in it. If you know your RPM's at 60 MPH, we can use that info too. However, popping off the diff cover and count the teeth on the drive gear, and then divide that by the number of teeth on the driven gear (or vise-versa...I always get those two confused) and that'll be your gear ratio. You'll be looking for a number something like 3.07 , 3.73, 4.10...ect. (those are the offered gears in a 1/2 ton in 71) I say it is a good idea becouse you'll be draining the gear oil, which was probably neer chainged...33 year old oil doesn't do much good.

08-30-2004, 03:20 PM	#4
71Longbed Not Mine But A beauty Join Date: Aug 2004 Location: Southern CaL Posts: 368	My 71 cheyenne came with lots of options as i have been able to tell in the glove box it had this number under modle i dont know if that is correct or not Ce1c934 the truck has this list in the glove box of options bucket seats Front stabalizer hydro brake booster turbo hydromatic chrome hub caps custom sports truck olive bucket vinyl trim tinted glass belt molding heavy rear spring 350 v8 power steering amp oil temp gauge white and medium olive those are the listed options it has disk brakes also



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