rear axle swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jr.chevy · 05-23-2002, 11:46 PM

I have a 72 3/4 with coils under the rear. The gears are 4.56 what are the other ratios the 3/4's come with. And what is the best way to tell what the ratio is while looking through the bone yards.

da-burb · 05-24-2002, 08:43 AM

You probably have the Corporate/Eaton axle under your truck. You need to find a Dana 60. The best all around gear you can get is in the Dana 60. It would be the 3.54 ratio. It was standard behind all big block 3/4 ton trucks. It was an option when behind any other engine. So if you see a C-20 badged with the 400 engine you would have a 99% chance of it being a Dana 60-3.54 gears.

Someone on the parts board had a rolling frame with Dana 60-3.54 for $100 last week. If I remember it was in the Mid-West.

------------------
1971 C-10 Suburban
1972 C-10 Suburban
1969 XL Galaxie Fastback
1968 Galaxie 500 Fastback
1974 SCOUT II

Montrose, Minnesota

*Fast68Chevy* · 05-24-2002, 12:01 PM

was not avaialble with anything except certain 400 trucks, couldnt get it with any other engine, and it wasnt an option anyways, it automatically came with certain 400 trucks whther you wanted it or not,

you can find a 4.10 3/4 ton axle, tey are common, look for V8 trucks with either 4 speed or auto tranny

4.56 is not the eaton axle ratio, 4.57 is,,

pretty sure that 3.54 dana only came with the 435cr tranny, which is very uncommon tranny to find, if not rare. i have yet to see one.

good luck
------------------
Randy- Lincoln, IL
randy@ccaonline.com 2177353230
parting out: '81 Cutlass Supreme, 84 SE Firebird T5 3.73, 90 corsica 3.1L, 71 C-10 project truck, 68 fenders, clean doors, repairable cab, 3.07 axle, 465 tranny, blazer tank, etc
*Paint is overrated* © RSS Enterprises 2000

[This message has been edited by Fast68Chevy (edited May 24, 2002).]

jr.chevy · 05-24-2002, 07:48 PM

Thanks I am going to look at a 71 chevy c 20 it has a four speed but not sure what the motor is because there aint no motor. From what the guy was saying there is no rust either only a few small dents. We will see.
once again thanks

05-23-2002, 11:46 PM	#1
jr.chevy Registered User Join Date: May 2002 Location: STURGIS SD Posts: 23	rear axle swap I have a 72 3/4 with coils under the rear. The gears are 4.56 what are the other ratios the 3/4's come with. And what is the best way to tell what the ratio is while looking through the bone yards. __________________ 48 Chevy 3600 67 Pontiac Catalina 72 Chevy C 20 78 Chevy C 10 4X4 97 Monte Carlo 99 Sportster

05-24-2002, 08:43 AM	#2
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	You probably have the Corporate/Eaton axle under your truck. You need to find a Dana 60. The best all around gear you can get is in the Dana 60. It would be the 3.54 ratio. It was standard behind all big block 3/4 ton trucks. It was an option when behind any other engine. So if you see a C-20 badged with the 400 engine you would have a 99% chance of it being a Dana 60-3.54 gears. Someone on the parts board had a rolling frame with Dana 60-3.54 for $100 last week. If I remember it was in the Mid-West. ------------------ 1971 C-10 Suburban 1972 C-10 Suburban 1969 XL Galaxie Fastback 1968 Galaxie 500 Fastback 1974 SCOUT II Montrose, Minnesota __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

05-24-2002, 07:48 PM	#4
jr.chevy Registered User Join Date: May 2002 Location: STURGIS SD Posts: 23	Thanks I am going to look at a 71 chevy c 20 it has a four speed but not sure what the motor is because there aint no motor. From what the guy was saying there is no rust either only a few small dents. We will see. once again thanks __________________ 48 Chevy 3600 67 Pontiac Catalina 72 Chevy C 20 78 Chevy C 10 4X4 97 Monte Carlo 99 Sportster

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05-24-2002, 12:01 PM	#3
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	was not avaialble with anything except certain 400 trucks, couldnt get it with any other engine, and it wasnt an option anyways, it automatically came with certain 400 trucks whther you wanted it or not, you can find a 4.10 3/4 ton axle, tey are common, look for V8 trucks with either 4 speed or auto tranny 4.56 is not the eaton axle ratio, 4.57 is,, pretty sure that 3.54 dana only came with the 435cr tranny, which is very uncommon tranny to find, if not rare. i have yet to see one. good luck ------------------ Randy- Lincoln, IL randy@ccaonline.com 2177353230 parting out: '81 Cutlass Supreme, 84 SE Firebird T5 3.73, 90 corsica 3.1L, 71 C-10 project truck, 68 fenders, clean doors, repairable cab, 3.07 axle, 465 tranny, blazer tank, etc Paint is overrated © RSS Enterprises 2000 [This message has been edited by Fast68Chevy (edited May 24, 2002).]



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