Trans swap question - Ford Powerstroke Diesel Forum
6.9L IDI Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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post #1 of 2 Old 02-14-2012, 12:14 PM Thread Starter Rookie
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Trans swap question

Hey guys I have an 85 f-350 dually with the 6.9 and c-6 3spd auto. I have a top speed of between 55-60mph at about 3000-3500. My question is, can I swap a newer trans from say a 7.3 into mine? I just need something that can get me up to highway speeds (70-75mph). I would like to keep the gearing the same, (4:10) I believe because I tow my 29ft fifth wheel and haul alot of heavy loads.

So bassicaly what trans models will "Bolt on" to my 6.9 IDI?

Thanks in advance.

F-350 Crew. 6.9 idi Dually "Fat Betty"
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post #2 of 2 Old 02-14-2012, 01:33 PM

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doesnt the 6.9 idi have the same bolt pattern for the 7.3 idi? if so you can use them all, zf5, i think a zf6 would even work, but the e40d from a powerstroke wont work, kause its run by the pcm, so 95+ no go on auto, good luck

2011 f150 ecoboost 4x4 323/452 on php dyno 11/16/13
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Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked

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Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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