57 GMC, frame swap, 4wd, 454 big block, 4 speed

[Old57]

Originally Posted by Purcell69

Great work! That big block will love the overdrive and with the torque it makes, you really won't notice a reduction in power, just lower RPM at highway speed.

-Joe

Thanks! Yes, it has plenty of torque and definitely has no problem at cruising at 70. I'm hoping to get the axle shims changed today to see if that fixes the driveline vibration on the highway.

[Purcell69]

Originally Posted by Old57

Thanks! Yes, it has plenty of torque and definitely has no problem at cruising at 70. I'm hoping to get the axle shims changed today to see if that fixes the driveline vibration on the highway.

Here's hoping! I think you are right about the vibration at speed. Getting the pinion/driveline angles right should fix it.

My new radiator arrived yesterday. I'm switching to all aluminum with a built in trans cooler rather than monkey around anymore with the Cummins trans cooler. Also, FedEx delivered some new rear tires today, so at least all four will be the same size now. I just need a nice day off to install some goodies.

I didn't give it any thought, since I'm sitting on a stock suspension, but I probably need to double check mine, since I moved the engine back 3".

-Joe

[Old57]

Originally Posted by Purcell69

Here's hoping! I think you are right about the vibration at speed. Getting the pinion/driveline angles right should fix it.

My new radiator arrived yesterday. I'm switching to all aluminum with a built in trans cooler rather than monkey around anymore with the Cummins trans cooler. Also, FedEx delivered some new rear tires today, so at least all four will be the same size now. I just need a nice day off to install some goodies.

I didn't give it any thought, since I'm sitting on a stock suspension, but I probably need to double check mine, since I moved the engine back 3".

-Joe

I just saw your new parts on your thread, looking good. I got the pinion angle adjusted on mine, but I haven't had it back out to see if it fixed the vibration yet... between ice, snow, rain, and salt on the roads, it's keeping my truck shut up in the shop.

[Purcell69]

Originally Posted by Old57

I just saw your new parts on your thread, looking good. I got the pinion angle adjusted on mine, but I haven't had it back out to see if it fixed the vibration yet... between ice, snow, rain, and salt on the roads, it's keeping my truck shut up in the shop.

I don’t blame you for waiting. I wouldn’t want my truck out in the salt and ice either. Aside from any potential rust issues down the road, there is always that “other driver” that has no business diving in winter weather.

Best to wait it out to enjoy the fruit of your labor.

-Joe