What rear end is my 72 likely to have?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dubie · 05-06-2002, 11:16 AM

It is a factory 250 inline, 3 speed manual setup. Just curious as to what type of rear end came in truck with this powertrain set up. Thanks

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72 C/10 LWB 2wd
250 inline 6, 3 speed column shift. Soon to have a total facelift.

Bill72BB · 05-06-2002, 11:30 AM

72 C10 6 -cylinder ,3 speed manual
stock 3.73 ,Optional 3.07 or 4.11

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72 3/4ton Custom Camper BB,400 Dynamax Cermax headers , air,ps,pb,leafsprings
tilt,3.54 . 82 chevy silverado sb ,ps,pb pw,pd,air 350/350 Flowmaster 40.
Torrance Calif.

" If I knew I was going to live this long I would have taken better care of myself "

gmc-rob · 05-06-2002, 12:29 PM

How do you know what rear end a truck has? I just bought a 1971 GMC 2500 serria grande camper special with heavy coils springs and a th400. The rear end looks huge and the guy said it has a posi?? Thank you , ROB

bigvinnie · 05-06-2002, 12:48 PM

best way to verify posi is to get both rear tires off the ground, then spin one of the tires... if the other tire spins the same direction you have a posi.

While you're off the ground, make a chalk mark on one of the rear tires and spin it thru one complete revolution while watching how many times the driveshaft turns... if it's just a little more than 3 revs, it's a 3.07... a little less than 4, it's a 3.73... a little more than 4, it's a 4.11... good luck.

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'72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA
http://www.ixpres.com/vlusardi/chevtrk.htm

ViperRed67 · 05-06-2002, 01:11 PM

I had a 71 3/4 and it had a Dana 60 in the rear. This can be checked by looking at the casting mark on the lower right side next to the diff cover. It should just have a 60 there. Could also be a Eaton type, these have a drop out center section from the front. In half tons, I have seen both the 12 bolt and dana 44 rears.

*Fast68Chevy* · 05-06-2002, 01:59 PM

coil is most likely eaton axle in a 3/4 ton

look for axle No Spin G86 on glovebox door, if its there thne its ane eaton 5200lbs drop out center axle, be careful with axle keep eye closely on fluid level they are known for puking out fluid and chewing al bearings and no parts are available for them anymore, last used in 1972 since 1947

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Randy- Lincoln, IL
randy@ccaonline.com 2177353230
*many GM parts bought, traded, or sold -am parting out: '81 Cutlass Supreme Brougham

current fleet: -71 C-10 350/CH465/3.07- basketcase, #1
-90 Cavalier 2.2L sky blue, driver, was free
-84 Z28 5.0L/700R4/3.73 daily driver
-84 Firebird/SE 2.8L/T-5/3.73/engine bad, project #2
-82 purple Trans Am, project #3
*Paint is overrated*
© RSS Enterprises 2000

ViperRed67 · 05-06-2002, 02:14 PM

For what its worth "Randys ring and pinion" is now making all new ring gear sets for the eaton axle. Even down to 3:73 ratio

*Fast68Chevy* · 05-06-2002, 02:17 PM

i meant stock replacement type parts, whats the addy to the page that lists the eaton 10 bolt gears ?

------------------
Randy- Lincoln, IL
randy@ccaonline.com 2177353230
*many GM parts bought, traded, or sold -am parting out: '81 Cutlass Supreme Brougham

current fleet: -71 C-10 350/CH465/3.07- basketcase, #1
-90 Cavalier 2.2L sky blue, driver, was free
-84 Z28 5.0L/700R4/3.73 daily driver
-84 Firebird/SE 2.8L/T-5/3.73/engine bad, project #2
-82 purple Trans Am, project #3
*Paint is overrated*
© RSS Enterprises 2000

05-06-2002, 12:48 PM	#4
bigvinnie Registered User Join Date: Aug 2001 Location: escondido, ca 92026 Posts: 1,222	best way to verify posi is to get both rear tires off the ground, then spin one of the tires... if the other tire spins the same direction you have a posi. While you're off the ground, make a chalk mark on one of the rear tires and spin it thru one complete revolution while watching how many times the driveshaft turns... if it's just a little more than 3 revs, it's a 3.07... a little less than 4, it's a 3.73... a little more than 4, it's a 4.11... good luck. ------------------ '72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA http://www.ixpres.com/vlusardi/chevtrk.htm __________________ '72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA 72 Stepside Project

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05-06-2002, 11:16 AM	#1
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	What rear end is my 72 likely to have?? It is a factory 250 inline, 3 speed manual setup. Just curious as to what type of rear end came in truck with this powertrain set up. Thanks ------------------ 72 C/10 LWB 2wd 250 inline 6, 3 speed column shift. Soon to have a total facelift. __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

05-06-2002, 11:30 AM	#2
Bill72BB Thats the Hillbilly way Join Date: Jul 2001 Location: Torrance,Ca Posts: 5,979	72 C10 6 -cylinder ,3 speed manual stock 3.73 ,Optional 3.07 or 4.11 ------------------ 72 3/4ton Custom Camper BB,400 Dynamax Cermax headers , air,ps,pb,leafsprings tilt,3.54 . 82 chevy silverado sb ,ps,pb pw,pd,air 350/350 Flowmaster 40. Torrance Calif. " If I knew I was going to live this long I would have taken better care of myself " __________________ BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen ,

05-06-2002, 12:29 PM	#3
gmc-rob Registered User Join Date: Apr 2002 Location: Saskatoon,SK Canada Posts: 41	How do you know what rear end a truck has? I just bought a 1971 GMC 2500 serria grande camper special with heavy coils springs and a th400. The rear end looks huge and the guy said it has a posi?? Thank you , ROB

05-06-2002, 01:11 PM	#5
ViperRed67 Registered User Join Date: Apr 2002 Location: Holley, Oregon Posts: 32	I had a 71 3/4 and it had a Dana 60 in the rear. This can be checked by looking at the casting mark on the lower right side next to the diff cover. It should just have a 60 there. Could also be a Eaton type, these have a drop out center section from the front. In half tons, I have seen both the 12 bolt and dana 44 rears.

05-06-2002, 01:59 PM	#6
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	coil is most likely eaton axle in a 3/4 ton look for axle No Spin G86 on glovebox door, if its there thne its ane eaton 5200lbs drop out center axle, be careful with axle keep eye closely on fluid level they are known for puking out fluid and chewing al bearings and no parts are available for them anymore, last used in 1972 since 1947 ------------------ Randy- Lincoln, IL randy@ccaonline.com 2177353230 many GM parts bought, traded, or sold -am parting out: '81 Cutlass Supreme Brougham current fleet: -71 C-10 350/CH465/3.07- basketcase, #1 -90 Cavalier 2.2L sky blue, driver, was free -84 Z28 5.0L/700R4/3.73 daily driver -84 Firebird/SE 2.8L/T-5/3.73/engine bad, project #2 -82 purple Trans Am, project #3 Paint is overrated* © RSS Enterprises 2000

05-06-2002, 02:14 PM	#7
ViperRed67 Registered User Join Date: Apr 2002 Location: Holley, Oregon Posts: 32	For what its worth "Randys ring and pinion" is now making all new ring gear sets for the eaton axle. Even down to 3:73 ratio

05-06-2002, 02:17 PM	#8
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	i meant stock replacement type parts, whats the addy to the page that lists the eaton 10 bolt gears ? ------------------ Randy- Lincoln, IL randy@ccaonline.com 2177353230 many GM parts bought, traded, or sold -am parting out: '81 Cutlass Supreme Brougham current fleet: -71 C-10 350/CH465/3.07- basketcase, #1 -90 Cavalier 2.2L sky blue, driver, was free -84 Z28 5.0L/700R4/3.73 daily driver -84 Firebird/SE 2.8L/T-5/3.73/engine bad, project #2 -82 purple Trans Am, project #3 Paint is overrated* © RSS Enterprises 2000



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