Is an impeller available for the CRaftsman 257.796351 Blower

Most of the parts that use to be available for that model are no longer available, it is cheaper to buy new one.

Models parts no longer available
136.740360
136.748270
http://www.sears.com/craftsman-2-speed-blower-vac/p-07130376000P?sellerId=SEARS&prdNo=2&blockNo=2&blockType=G2

remove the vac attachment and there should be an attachment that goes on in place of the vac tub. Make sure the blower grate attachment "snaps" into place snugly. This deactivates the safety switch and guards your fingers from being cut up by the impeller baldes and allows the blower to start.

the auger and impeller are geared to work together. the auger does turn much slower then the impeller. You may not have a problem at all

auction ends in about 30 minutes, Hope this helped Tim:

http://cgi.ebay.com/25cc-craftsman-gas-leaf-blower-parts-model-358-794941-/150600458042?pt=LH_DefaultDomain_0&hash=item23107c9f3a

I am going to assume the belt is good if the impeller it running. You can check the belt by removing the plastic cover in the center of the snow blower.
With the unit safely turned off reach in and turn the blower by hand while putting a little resistance with your other hand on the impeller. Does the shaft from the impeller to the gear box turn?
Does the shaft that the augers are attached to turn? If the impeller shaft turns but the auger shaft doesn't, the gearbox in the front is bad and will have to be replaced.
I the auger shaft turns, check your shear pins again. Sometimes they will break but still stay stuck in the holes. Actually take one out and check it.
If it is a Craftsman you can get a manual from managemyhome.com and parts from searspartsdirect.com. You will need the model number of the snowblower. The number looks like 247.123456.
Any other questions please ask. Do't forget to rate this answer!

I know people buy this equipment to blow and vacuum. The main problem is if you vacuum up something that hits the impeller and breaks off one of the fins; you will have to take it somewhere to get the impeller replaced.
I would stick with it using it as a blower and get the rake out to get around the bushes.
Good Day.

I have not heard of one for that unit. Plus I would not use it for vacuuming any way. All you need is for an acorn or piece of wood to hit the impeller.
It would break a couple of fins off the impeller. This would make the blower vibrate like crazy and you will not want to hold on to it. Plus the cost of repairs would exceed the cost of a new one.
Good Day.

toro impellar is the same thing...even same part#(1009068)

does the impeller spin and not the augers.if so check sheer bolts.if neither impeller or auger spins check auger belt.