rearend ID please!!!!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

teeitup · 12-12-2003, 05:33 PM

Blazerman usually helps me on this but I'm home so I thought I'd ask the board
These are a Eaton 3/4 rearends 32 teeth, they are not a open rear, what are they for sure, or where can I look for #'s to find out? Thanks for the help Randy

teeitup · 12-12-2003, 05:34 PM

hi

1969 GMC · 12-12-2003, 05:43 PM

look like detroit lockers...perhaps

the pic I am attaching is of a detroit locker in a ho52.

teeitup · 12-12-2003, 09:48 PM

they look alot alike.

**MJN** · 12-12-2003, 09:57 PM

Those Eatons did come with detroits in them, if they are factory then they're detroits. Nice find!

teeitup · 12-12-2003, 10:02 PM

How do I determine ratio? Thanks Randy

Baradium · 12-12-2003, 11:53 PM

Rotate the gears, there should be a set of numbers stamped in the ring gear, divide the numbers and they will give you the ratio.

You can also count the teeth on both the ring and pinion gears and divide them out. With them out of the truck those two are probobly the only realistic ways to do it easily.

teeitup · 12-13-2003, 12:38 AM

No numbers stamped on ring gear, and you can't see the pinion. Another locker I had was the same with no numbers on it. Thanks Randy

breeh · 12-13-2003, 12:45 AM

4:10 is the most common ratio. They could also be 4:56 or 3:54.

lukecp · 12-13-2003, 12:47 AM

See how many turns of the pinon it takes to rotate the ring gear around once. Would proably be easier than counting teeth when the 3rd member is out of the rear like that

**Classic Heartbeat** · 12-13-2003, 12:49 AM

Randy, You should be able to see a series of stamped letters and numbers near the top of those slugs. It will be on the R/H side between the cooling fins. If you give me those numbers I will be able to identify them for you. I can tell you the gear ratio and weather or not they are lockers. WES www.ClassicHeartbeat.com

BLAZERMAN · 12-13-2003, 12:52 AM

Randy, are you sure they only have 32 teeth? I cant think of any ring gear with that few of teeth. Try this, mark a tooth on the ring gear with chalk and index it at the top of the case, mark a spot on the yoke and index it with a mark on the case, make 1 full revoulotion with the ring gear and count the number of times the yoke turns. Like 3-3/4 turns=3.73 4-1/2=4.56 just match it to the closest available gear ratio.

teeitup · 12-13-2003, 01:10 AM

Thanks guys, I'll try tomorrow when I get back from KC, if it doesn't snow too much. Yes Rob, I counted them twice and two of the one leggers had 32 teeth.
Thanks guys Randy

1969 GMC · 12-13-2003, 05:38 PM

Quote:

Originally posted by breeh
4:10 is the most common ratio. They could also be 4:56 or 3:54.

The 3.54 ratio wasn't available in the HO axles. If it is 3/4 ton or 1 ton, then its either 4.10 or 4.56...if that is out of a 1 ton dually, then it is 5.14.

69k5 · 12-13-2003, 11:55 PM

on those eaton third members look at the but end of the pinion and look at the last 2 two digit numbers and divide them. divide those and thats it. they wont be on the ring gear. you are gonna need a flshlight to look up in there and a rag will help for all the crap. if it has 3 (?? places that have like a 1" round rod") its a detroit ( no spin). if it has four then its open. also if you look inside the little observation hole in the 2nd pic. that one is smooth so its a no spin. if you see teeth then they are open. i also sent a pm to make sure yopu got it i know your busy.

69k5

12-12-2003, 05:33 PM	#1
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	rearend ID please!!!!!! Blazerman usually helps me on this but I'm home so I thought I'd ask the board These are a Eaton 3/4 rearends 32 teeth, they are not a open rear, what are they for sure, or where can I look for #'s to find out? Thanks for the help Randy __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

12-12-2003, 05:34 PM	#2
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	hi __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

12-12-2003, 05:43 PM	#3
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	look like detroit lockers...perhaps the pic I am attaching is of a detroit locker in a ho52. Attached Images __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

12-12-2003, 09:48 PM	#4
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	they look alot alike. __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

12-12-2003, 10:02 PM	#6
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	How do I determine ratio? Thanks Randy __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

12-12-2003, 09:57 PM	#5
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,051	Those Eatons did come with detroits in them, if they are factory then they're detroits. Nice find!

12-12-2003, 11:53 PM	#7
Baradium Binder Rep Join Date: Jan 2001 Location: Salcha, AK Posts: 1,506	Rotate the gears, there should be a set of numbers stamped in the ring gear, divide the numbers and they will give you the ratio. You can also count the teeth on both the ring and pinion gears and divide them out. With them out of the truck those two are probobly the only realistic ways to do it easily.

12-13-2003, 12:38 AM	#8
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	No numbers stamped on ring gear, and you can't see the pinion. Another locker I had was the same with no numbers on it. Thanks Randy __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

12-13-2003, 12:45 AM	#9
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	4:10 is the most common ratio. They could also be 4:56 or 3:54. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

12-13-2003, 12:47 AM	#10
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	See how many turns of the pinon it takes to rotate the ring gear around once. Would proably be easier than counting teeth when the 3rd member is out of the rear like that __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

12-13-2003, 12:49 AM	#11
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Randy, You should be able to see a series of stamped letters and numbers near the top of those slugs. It will be on the R/H side between the cooling fins. If you give me those numbers I will be able to identify them for you. I can tell you the gear ratio and weather or not they are lockers. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

12-13-2003, 12:52 AM	#12
BLAZERMAN Currently Blazerless Join Date: Apr 2000 Location: St. Joseph Mo. Posts: 4,828	Randy, are you sure they only have 32 teeth? I cant think of any ring gear with that few of teeth. Try this, mark a tooth on the ring gear with chalk and index it at the top of the case, mark a spot on the yoke and index it with a mark on the case, make 1 full revoulotion with the ring gear and count the number of times the yoke turns. Like 3-3/4 turns=3.73 4-1/2=4.56 just match it to the closest available gear ratio. __________________ 1972 C/30 133" W.B. C&C 1970 GMC 3500 157" W.B. single wheel C&C

12-13-2003, 01:10 AM	#13
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	Thanks guys, I'll try tomorrow when I get back from KC, if it doesn't snow too much. Yes Rob, I counted them twice and two of the one leggers had 32 teeth. Thanks guys Randy __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

12-13-2003, 11:55 PM	#15
69k5 Registered User Join Date: Nov 2003 Location: Monroe, La 71202 Posts: 317	on those eaton third members look at the but end of the pinion and look at the last 2 two digit numbers and divide them. divide those and thats it. they wont be on the ring gear. you are gonna need a flshlight to look up in there and a rag will help for all the crap. if it has 3 (?? places that have like a 1" round rod") its a detroit ( no spin). if it has four then its open. also if you look inside the little observation hole in the 2nd pic. that one is smooth so its a no spin. if you see teeth then they are open. i also sent a pm to make sure yopu got it i know your busy. 69k5

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.