Rear end interchange - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Truckhead · 01-26-2004, 06:06 PM

I would like to put a more streetable gear in my 70 C10, something about 3.10.

I don't know that much about the Chevy interchanges, but was wondering what would go in easy.

I have a 6 bolt, but could switch to a 5 bolt if this would help the possibilities.

My Ford 9 inch experience, being so easy to just install a different pumpkin. has spoied me some. Might it be easier to put in a different gear to the existing stock rear? My only problem is getting someone to do it right; I hear it can be a problem. Is this so?

walker · 01-26-2004, 08:54 PM

Used rears are going for about $100. Just swap one out, there seems to be plenty in your part of town. New set of gears and bearings run about $250 for the whole shebang, if you install it. Builing a ford 9" is going to be substantially more. Figure $150 for the rear, $250 for the bearing etc., another few hundred to get all the perches and stuff welded on.

lukecp · 01-26-2004, 09:15 PM

A 67-70 coil rear will bolt right in and retain the 6-lug pattern. No modifications neccessary. 3.07 was available in these trucks, and was great for crusing the highways. I have 3.07 gears in my truck and pull 3000 rpms at 75mph, and about 2300 at 60mph with 28" tires.

Look for a 3.07 rear in a original 350 or big-block truck with an auto tranny. Pop off the cover, and look at the ring gear. The number of teeth should be stamped on the ring gear, and 43 14 is 3.07.

I have had bad luck with junkyard rears.....but i think i got one with half a million miles on it or someting. Check for metal particles in the fluid (proably setteled at the bottom), and excess play anywhere.

$150 or less is a fair price for a 3.07 non-posi rear.

Blue Beard · 01-26-2004, 10:28 PM

I have a 70 but can't find any numbers on the housing to tell me what gears I have.....

lukecp · 01-26-2004, 10:47 PM

Quote:

Originally posted by Blue Beard
I have a 70 but can't find any numbers on the housing to tell me what gears I have.....

Pop the cover and the numbers are stamped on the ring gear

67dragtruck · 01-27-2004, 12:37 AM

Anybody happen to remember the width of the stock rear for the coil spring trucks, from drum to drum. I ditched mine a long time ago and am considering some new iterations of my truck and just wanting to do some math.

Thanks,

Tom

Blue Beard · 01-27-2004, 12:39 AM

Which 5 lug rearends interchange?

01-26-2004, 06:06 PM	#1
Truckhead 18436572 Join Date: Aug 2003 Location: Waynesboro, Va. Posts: 488	Rear end interchange I would like to put a more streetable gear in my 70 C10, something about 3.10. I don't know that much about the Chevy interchanges, but was wondering what would go in easy. I have a 6 bolt, but could switch to a 5 bolt if this would help the possibilities. My Ford 9 inch experience, being so easy to just install a different pumpkin. has spoied me some. Might it be easier to put in a different gear to the existing stock rear? My only problem is getting someone to do it right; I hear it can be a problem. Is this so?

01-26-2004, 08:54 PM	#2
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	Used rears are going for about $100. Just swap one out, there seems to be plenty in your part of town. New set of gears and bearings run about $250 for the whole shebang, if you install it. Builing a ford 9" is going to be substantially more. Figure $150 for the rear, $250 for the bearing etc., another few hundred to get all the perches and stuff welded on. __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold Last edited by walker; 01-26-2004 at 08:57 PM.

01-26-2004, 09:15 PM	#3
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	A 67-70 coil rear will bolt right in and retain the 6-lug pattern. No modifications neccessary. 3.07 was available in these trucks, and was great for crusing the highways. I have 3.07 gears in my truck and pull 3000 rpms at 75mph, and about 2300 at 60mph with 28" tires. Look for a 3.07 rear in a original 350 or big-block truck with an auto tranny. Pop off the cover, and look at the ring gear. The number of teeth should be stamped on the ring gear, and 43 14 is 3.07. I have had bad luck with junkyard rears.....but i think i got one with half a million miles on it or someting. Check for metal particles in the fluid (proably setteled at the bottom), and excess play anywhere. $150 or less is a fair price for a 3.07 non-posi rear. __________________ '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

01-26-2004, 10:28 PM	#4
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	I have a 70 but can't find any numbers on the housing to tell me what gears I have..... __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

01-27-2004, 12:37 AM	#6
67dragtruck Registered User Join Date: May 2001 Location: Bethlehem, GA, USA Posts: 389	rears Anybody happen to remember the width of the stock rear for the coil spring trucks, from drum to drum. I ditched mine a long time ago and am considering some new iterations of my truck and just wanting to do some math. Thanks, Tom

01-27-2004, 12:39 AM	#7
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	Which 5 lug rearends interchange? __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo



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