I replaced the lower seal only on my 89 2wd which solved my slow leak. The seal from rock auto was not correct. I measured and ordered a generic oil seal from Amazon. 30x42x7mm. I was able to pop it out and replace it by simply dropping the pitman arm and having a go at it with some picks and chisels. Someone had put my seal in upside down which made getting it out a real pain in the ass.