transmission service
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New User
Joined: May 2004
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transmission service
I have an early 99 F250 super duty 4x4 with 108k on it. I have had the trans. flushed twice before without removing the pan. I am taking it wed. to have the trans. serviced. After reading the threads here I think the trans. is the weakest part of this truck. I would like to have the pan pulled this time to change the filter and also thinking about putting an auxilliary cooler on it to cut down on the heat. I think I have the 4r100 trans. Can I switch to synthetic fluid this time or stay with regular? I enjoy this forum and thank you for your responses.
Posting Guru
Joined: Jul 2003
Posts: 2,210
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You do have a 4R100. You can switch to synthetic as long as you get a MERCON synthetic. Don't use a fluid that says MERCON V, or meets both MERCON and MERCON V. Your owner's manual says that you could have serious transmission damage if you use MERCON V. I use Mobil 1 synthetic ATF. It is MERCON rated, but not MERCON V.
Posting Guru
Joined: Mar 2003
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I have to wonder were the Weak 4R100 tranny BS comes from!! I have 190,200 miles on mine and I have never had a single problem with it!! I didn't change the Fluid until 141,000 miles and only checked it 4 times durring that period!! I did switch to Mobil 1 Syn. at that time and I haven't checked it sense!!
Postmaster
Joined: Nov 2003
Posts: 3,595
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From: Utah County, UT
Get a bigger heavier trailer, then get stupid and try pulling that block over mountanious hills at 75+mph, that'll probably start some of the "week 4r100 tranny BS"
It all boils down to how each individual drives.
It all boils down to how each individual drives.
Posting Guru
Joined: Mar 2003
Posts: 1,521
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Over the last 6,500 miles I've put over 2,000 on mobey pulling my 8x18x9'6" high 10,000# trailer!! Mobey knows it's back there!! Don't have any mountains to deal with but I do drive like hell!! Still never had a single problem!!
