Rear end gears, how to tell what they are? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

86swb · 09-22-2005, 08:39 AM

Is there anyway to tell what the gears are in the diff? Really do not want to pull the back off and if I did still do not know how to tell. Would just like to know what I have back there.

454HO · 09-22-2005, 11:26 AM

Go to Jiffy-Lube and get your rear gear oil changed. Count the teeth on both the ring and pinion while they have the cover off. Any other way and you are just guessing. Plus, it probably needs to have the oil changed anyway if you don't know when it was last done.

86swb · 09-22-2005, 12:02 PM

Quote:

Originally Posted by 454HO

Go to Jiffy-Lube and get your rear gear oil changed. Count the teeth on both the ring and pinion while they have the cover off. Any other way and you are just guessing. Plus, it probably needs to have the oil changed anyway if you don't know when it was last done.

Well, you are right there. I do not know when was the last time the oil in the rear gears were changed. When you know how many geeth there are how do you tell if it is a 3:73 or what? Someone told me a while back that you could turn the drive shalf to see how many times the wheel turns compared to how many times the drife shalf turns.

Captkaos · 09-22-2005, 01:14 PM

If the ring gear is exposed and it is a GM gear the number will be stamped like 41/11. Take the first number divided by the second.

djracer · 09-23-2005, 11:25 PM

count the rotations on the driveshaft versus 1 full turn of the tire. gm gears only come in certain ratios so its not hard to figure out!

86swb · 09-23-2005, 11:32 PM

Still would not know what the gears are. 1 full turn of the tire and say 3 turns of the driveshaft would tell you what? 3 to 1=??

djracer · 09-24-2005, 12:03 AM

its not going to be exactly 3 turns! a little less than 3 and a half would be a 3.42 a little more than 3 and a 3/4 would be a 3.73!

You follow me.

86swb · 09-24-2005, 12:12 AM

OK, now I got you. Thanks

09-22-2005, 08:39 AM	#1
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	Rear end gears, how to tell what they are? Is there anyway to tell what the gears are in the diff? Really do not want to pull the back off and if I did still do not know how to tell. Would just like to know what I have back there. __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

09-22-2005, 11:26 AM	#2
454HO Registered User Join Date: Apr 2005 Location: Austin, TX Posts: 1,223	Go to Jiffy-Lube and get your rear gear oil changed. Count the teeth on both the ring and pinion while they have the cover off. Any other way and you are just guessing. Plus, it probably needs to have the oil changed anyway if you don't know when it was last done. __________________ - Greg

09-22-2005, 01:14 PM	#4
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	If the ring gear is exposed and it is a GM gear the number will be stamped like 41/11. Take the first number divided by the second. __________________ 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

09-23-2005, 11:25 PM	#5
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,894	count the rotations on the driveshaft versus 1 full turn of the tire. gm gears only come in certain ratios so its not hard to figure out! __________________ Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!

09-23-2005, 11:32 PM	#6
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	Still would not know what the gears are. 1 full turn of the tire and say 3 turns of the driveshaft would tell you what? 3 to 1=?? __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

09-24-2005, 12:03 AM	#7
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,894	its not going to be exactly 3 turns! a little less than 3 and a half would be a 3.42 a little more than 3 and a 3/4 would be a 3.73! You follow me. __________________ Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!

09-24-2005, 12:12 AM	#8
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	OK, now I got you. Thanks __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS



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