I am restoring an old dodge truck and I got the back window out and I have all new seals for it but I can not get it back in, what is the best way to get the window back in?

 

Sometimes soap, window cleaner or some light grease will help it in.

 

If your talking about the rubber gasket type get very soapy water.lubricate the gasket well,get some kite string,put it in the channel of the gasket.Then put the gasket on the window and find a helper.Have your helper hold the glass in place using moderate pressure.then you pull the string out slowly(from inside the truck) working the gasket into place.Just take your time it works well,Ive used this method on a 1957 Belair I owned.

 

try taking the seal putting it in hot water and letting it soak for about 30 min . thats what done on a ford windshield.GOOD LUCK