Transmission compatability
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Joined: Oct 2006
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From: SE Texas
Originally Posted by rev2fast
Can I put a 4r100 in place of the 4r70w currently in my truck? 4.6l engine, 4wd.
Thanks.
Thanks.
JL
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Joined: Oct 2006
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From: SE Texas
Originally Posted by rev2fast
JL - Thanks for the info. Will the new PCM/EEC still run the 4.6 as a 4.6 or a 5.4 or will that make any difference?
Any particular reason that you're looking at swapping in a 4R100?
JL
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I've got 104K on mine now, and it shudders/slips in OD, and when towing in 1-2 shifts (out of OD). My thinking was the 4r100 was a stronger trans and with our mountains in Alaska and my 6000 lb trailer (wet), it would be a better tow trans over the stock one. (The 4.6 has approx 260 hp - intake, exhaust) But the big reason: I can get a used unit with 37K miles for $300.
Postmaster
Joined: Oct 2006
Posts: 4,171
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From: SE Texas
Originally Posted by rev2fast
I've got 104K on mine now, and it shudders/slips in OD, and when towing in 1-2 shifts (out of OD). My thinking was the 4r100 was a stronger trans and with our mountains in Alaska and my 6000 lb trailer (wet), it would be a better tow trans over the stock one. (The 4.6 has approx 260 hp - intake, exhaust) But the big reason: I can get a used unit with 37K miles for $300.
The 4R100 is a stronger trans,but be careful of it if it's a 2000-2001 model,there were some changes to a OWC at that time from the mechanical diode to a roller type. The mechanical diode type in the 4R100 has been very failure prone,and was the reason for a TSB to be issued to correct the problem. By the time you round up the trans for $300, get the EEC and harnesses that'll be needed, modify your driveshaft or the 4R100 driveshaft for fitament on the 8.8" in your F150, and buy the tuner or have the truck's EEC tuned for displacement...you could have bought a really strong 4R70W....possibly even cheaper than the 4R100 swap.
JL
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Good call... I'll check and verify that I don't have a fluid issue or something simple, and then a couple of trans shops to see if they can flash the EEC. I appreciate the great input! (She's actually a '00 Expedition.) Thanks..
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Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
Originally Posted by rev2fast
Good call... I'll check and verify that I don't have a fluid issue or something simple, and then a couple of trans shops to see if they can flash the EEC. I appreciate the great input! (She's actually a '00 Expedition.) Thanks..
JL
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