main seal question

[Cowboy]

i just replaced the rear main seal on my 74 J4000. I still have it my jeep apart. Should i replace the front seal also? Will there be problems with the seal leaking since the crankshaft was loosened?

[Bombadier]

as long as you've got it apart, replace every seal you can. they shouldn't leak as long as you tighten it all back down good again.