Rear End Swap

[Minkota]

I have a 67 C10 Stepside that needs new rear end. i happen to have a 1970 Suburban rear end. they appear the same. would there be any reason they will not be direct swap?

also, what was factory gear ratio for a 70 suburban?

[demian5]

If both are coil spring trucks it should be a straight up swap.

There is no "factory" gear ratio. You will have to count rotations or pull the cover and look at the numbers on the ring gear (which you should be doing anyways to change fluid at least, if not, replace axle seals too).

I always recommend an adjustable track bar if you have the $$. Then you can center the diff.

[Minkota]

Originally Posted by demian5

If both are coil spring trucks it should be a straight up swap.

There is no "factory" gear ratio. You will have to count rotations or pull the cover and look at the numbers on the ring gear (which you should be doing anyways to change fluid at least, if not, replace axle seals too).

I with the 2 rear ends direct swap?

I always recommend an adjustable track bar if you have the $$. Then you can center the diff.

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[Minkota]

Will this be a direct swap?
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[gmc684x4]

I found most 1/2 ton trucks i have played with are 3.73 ratio
my 72 is 3.07 so best to open it up check the stamped numbers on the ring gear and change the axle seals as well
not to just save your brakes to save your swapped diff as well

[LockDoc]

Originally Posted by demian5

If both are coil spring trucks it should be a straight up swap.

There is no "factory" gear ratio. You will have to count rotations or pull the cover and look at the numbers on the ring gear (which you should be doing anyways to change fluid at least, if not, replace axle seals too).

I always recommend an adjustable track bar if you have the $$. Then you can center the diff.

There is a "standard" ratio from the factory depending on the engine/transmission combination, unless there is an option listed on the SPID on the inside of the glove box door.

LockDoc

[Minkota]

Originally Posted by LockDoc

There is a "standard" ratio from the factory depending on the engine/transmission combination, unless there is an option listed on the SPID on the inside of the glove box door.

LockDoc

The rear end came out of a 1970 Suburban with Automatic transmission, unfortunatly I do not have the SPID.

When I spin the yoke and count I get about 2.25 turns of the yoke to 1 turn of the wheel. That seems slightly higher than I was expecting.

Do you know what the highest options available for that year Suburban were?

[LockDoc]

Originally Posted by Minkota

The rear end came out of a 1970 Suburban with Automatic transmission, unfortunatly I do not have the SPID.

When I spin the yoke and count I get about 2.25 turns of the yoke to 1 turn of the wheel. That seems slightly higher than I was expecting.

Do you know what the highest options available for that year Suburban were?

Not off the top of my head I don't. My '69 Suburban had a 3.08 gear in it and I ended up changing it to a 3.73.

Look at this thread.

http://67-72chevytrucks.com/vboard/s...d.php?t=578793

Check out posts # 8 & 19 for the code locations. You only use the first two or three letters of the code number.

LockDoc