The Stovebolt Site Forums The Shop Area Engine Shop Eaton 4.10 swap

I finally found a 4.10 Eaton from a 1970 3/4 ton C20 and want to do the pumpkin swap for my 4.56 but am having a hard time finding actual tech articles or threads on how to do the switch. I am defineltly not a rear end/axle expert. Any advice would be appreciated.
Thanks
Todd

It's a bolt in job, no special tools or knowledge. Unbolt your axles and slide them out a few inches, unbolt the 4.56 pumpkin and remove it. Bolt the 4.10 unit in it's place with a new gasket. Then slide your axles in and bolt them up.

Good find. Those are rare. Unbolt the axle flanges & pull them out a little. Remove the rear cover. Remove the drive shaft. Remove the nut's off the studs holding the pumkin in. Put some old boxes under it & shove it out to fall on the boxes. Disregard if you are working on a lift. Clean all gasket surfaces. The gasket for the pumkin mount is real thin paper. The one for the cover is thick cork. New gaskets are available for the axle flanges or you can use RTV. Mount the replacement on a jack & reasemble it all. Those dudes are really heavy. Fill it to the plug level with 85-140 gear lube. It takes about 6 pint's.

Thanks gentlemen. Can I find gaskets at the local NAPA? Also, I am leaking oil from the drivers side axle flange, do you suggest removing the axle and replacing all the seal or do I just need a new axle flange gasket? Once I get the axle out and the hub off is it hard to replace the seals? Any special tools needed?
Thanks again
Todd

You should replace the axle seals for sure. The pumpkin is quite heavy so it can be tricky to get lined up. The thin paper gasket can distort really easily so be careful with it. I would suggest getting new metal axle flange gaskets. FLAPS should have all the gaskets. Here is an article on the subject:
Pumpkin Swap

Here's some info.
http://www.oldgmctrucks.com/page0276.html