The Stovebolt Site Forums The Shop Area Engine Shop chevy in a GMC frame motor mounts

The 58 GMC I have has a 235 in it with a jury rig motor mount. I've got to replace the mount so maybe something better than a piece of flat steel bolted to the cross member. What have others done to accomplish this. Thanks
Larry

The 'old style' front mount is available, long strip of thick rubber and may have a steel core also. Or if your 235 has the side mount holes you may opt for bolting something to the side.

I've got the front clip pulled off now while I take care of some termites and I think I'll pull engine and replace a few gaskets while I'm at it. Some time in the past the 270 was removed and a plate was cut out with torch, didn't even clean the slag, a just 2 bolts through the cross member with the stock mount sitting on it. It sits low enough to see that the drive shaft isn't straight. I see that stock mount in the Bobs chevy truck catalogue think I'll order one an go from there.
Thanks
Larry

You could change the front crossmember to the chevy one. But if it were me, I would try to find a 270 or 302.

I agree. Finding a 270 or 302 would be ideal and replacing that cut crossmember is only work not science. Its a shame to have that little Chevy in a proud GMC.

Cross member isn't cut. They just cut a piece of flat steel and bolted it to the top of the cross member. Does the GMC in 58 have a different cross member than the Chevy. I remember looking at a beautiful 1956 GMC here in Richmond Va and his cross member didn't look anything like mine. Of course he had the axel on the front with somekind of extra coil sping arrangement on the ends of his front axel where the king pins were. As for a 270 or a 302 I think if I were to take out the 235, which runs like a clock just needs seals, I'd have to find me a small block, maybe an old 283, I loved those things back in the 70's.

Yeah I like the old 283s too. I'm not sure its the choice I'd make but its one I understand. I have one in a back corner and am thinking about putting it in something in the next year.

Does the GMC in 58 have a different cross member than the Chevy.

The 58-59 gmc has a different crossmember than both the 55-57 gmc trucks and the 55-59 chevy trucks. Swapping the crossmember with a chevy one will allow you to mount the chevy motor like a chevy.

As for your choice of a 283, not my cup of tea. I built a 59 pontiac 389 for my 59 gmc with 3 deuces. Since my truck was an original v8 truck it was a drop in deal. This weekend I fired up the 302 for my 1940 gmc for the first time ever. It ran perfectly with the 5 deuce manifold. Anybody can put a small block into any vehicle, in fact they do that everyday. The 270s and 302s are tough motors, and have a cool factor that is off the charts.

Well its a long ways to finish so I'll keep my eyes open for a little something different in the engine department but in the mean time the 235 will stay. I've got a lot of work to do to get this back to the street again. Thanks for all your input. Larry