ID this rear end, please? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevy_fatman · 05-09-2003, 02:36 PM

I just got me this week a '68 chevy 3/4 ton long stepbed, inline 6 with 3 on the tree, and this rear end is under it, I know is a 10 bolt but what ratio is the most likely to be?

Thank you for any help. Fatman.

chevy_fatman · 05-09-2003, 02:36 PM

here's a close up.

Rod · 05-09-2003, 02:46 PM

Thats the corporation diff / aka Eaton diff... in a 68 with a 6 cyl and a three speed I'd bet money on 457 ratio.

chevy_fatman · 05-09-2003, 03:11 PM

Thank for the quick reply Rod.

Quote:

Originally posted by Rod
I'd bet money on 457 ratio.

If so, how highway friendly is it?

Thanks. Fatman.

Rod · 05-09-2003, 03:26 PM

Its a pulling rear end.. not real highway friendly... 60 mph is pushing it... that 6cyl will be reving big time. But it is simple to put a set of 4.10 in... you can do it without even lifting the truck..., drain oil, pull the axles, disconnect drive shaft, take out the ten bolts at the forward part of rear of the diff...swap in the whole pumpkin from a 410 ratio...
reconnect drive shaft, slide axles back in, refill oil. Simple.

chevy_fatman · 05-09-2003, 03:35 PM

Cool man!, so much aknowledge, it dwarfs me, all this info is greatly appreciated. Paul.

Big69C20 Toy · 05-09-2003, 03:38 PM

yep. and FYI the only lower gear set i know of for those toys is a 3.90, so not much help there. If you're lucky it might have a locker unit (or posi i cant recall) in it. 4.57 would definately be my guess as well though. Good luck

Rod · 05-09-2003, 08:49 PM

You can buy 4.10 or 3.90 still today if you want.... they only want $995 for the complete pumpkin... or $460 for the gears alone.... go ahead and buy them if you wish... but you might wanna talk to somebody and get a second price.. I have a few sets of 4.10.
http://www.rearman.com/truck.htm

jostrans68 · 05-09-2003, 10:34 PM

Rod I got the gears for 225 at randys ring and pinion

Longhorn Man · 05-09-2003, 11:36 PM

Rod, any chance you micht wanna part with a 4.10 set up? I don't think my caddy motor will like the 4.56 in mine.

05-09-2003, 02:36 PM	#1
chevy_fatman Where's my beer? Join Date: Aug 2002 Location: I live in the state of denial.... Posts: 5,620	ID this rear end, please? I just got me this week a '68 chevy 3/4 ton long stepbed, inline 6 with 3 on the tree, and this rear end is under it, I know is a 10 bolt but what ratio is the most likely to be? Thank you for any help. Fatman. Attached Images __________________ Paul How do you make the invisible, visible?.........You take it away.

05-09-2003, 02:36 PM	#2
chevy_fatman Where's my beer? Join Date: Aug 2002 Location: I live in the state of denial.... Posts: 5,620	here's a close up. Attached Images __________________ Paul How do you make the invisible, visible?.........You take it away.

05-09-2003, 02:46 PM	#3
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Thats the corporation diff / aka Eaton diff... in a 68 with a 6 cyl and a three speed I'd bet money on 457 ratio. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

05-09-2003, 03:26 PM	#5
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Its a pulling rear end.. not real highway friendly... 60 mph is pushing it... that 6cyl will be reving big time. But it is simple to put a set of 4.10 in... you can do it without even lifting the truck..., drain oil, pull the axles, disconnect drive shaft, take out the ten bolts at the forward part of rear of the diff...swap in the whole pumpkin from a 410 ratio... reconnect drive shaft, slide axles back in, refill oil. Simple. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

05-09-2003, 03:35 PM	#6
chevy_fatman Where's my beer? Join Date: Aug 2002 Location: I live in the state of denial.... Posts: 5,620	Cool man!, so much aknowledge, it dwarfs me, all this info is greatly appreciated. Paul. __________________ Paul How do you make the invisible, visible?.........You take it away.

05-09-2003, 03:38 PM	#7
Big69C20 Toy Livin' it up. Join Date: Nov 2001 Location: Richland, MI Posts: 2,212	yep. and FYI the only lower gear set i know of for those toys is a 3.90, so not much help there. If you're lucky it might have a locker unit (or posi i cant recall) in it. 4.57 would definately be my guess as well though. Good luck __________________ -Greg; Sold the 69 C20. It's off to a better home with more love! Now onto the 86 CUCV M1009; K5 blazer with 6.2L diesel, corp 10 bolt axles, Detroit locker in the rear, trutrac front, 3.73 gears, 35" tires.

05-09-2003, 08:49 PM	#8
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	You can buy 4.10 or 3.90 still today if you want.... they only want $995 for the complete pumpkin... or $460 for the gears alone.... go ahead and buy them if you wish... but you might wanna talk to somebody and get a second price.. I have a few sets of 4.10. http://www.rearman.com/truck.htm __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

05-09-2003, 10:34 PM	#9
jostrans68 Jostrans68 Join Date: Mar 2001 Location: Bloomington indiana Posts: 1,182	Rod I got the gears for 225 at randys ring and pinion __________________ [CGTW Member former 67-72 now with a 96 silverado

05-09-2003, 11:36 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Rod, any chance you micht wanna part with a 4.10 set up? I don't think my caddy motor will like the 4.56 in mine.

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