5 speed to 6 speed - Ford Powerstroke Diesel Forum

 
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post #1 of 10 Old 03-08-2013, 05:05 PM Thread Starter
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Arrow 5 speed to 6 speed

5 speed is getting ready to come apart in my truck thinking about changing to a 6 speed if I can find one is there any major changing I'll have to do to make it work and will my t-case change over and bolt to it
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post #2 of 10 Old 03-08-2013, 05:25 PM
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Doubt the t case would, obs uses a bw, sd has an np, your gonna have to modify the trans hump, and a trans cross member too

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post #3 of 10 Old 03-08-2013, 09:21 PM Thread Starter
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Alright thinks for the help I checked the ratios and not much difference in them other than a lower first gear
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post #4 of 10 Old 03-08-2013, 11:45 PM
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The transfer case in the super duty had a different input for auto and manual trucks. The OBS used the same input on auto and manual that was used on the SD autos.

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post #5 of 10 Old 03-09-2013, 01:37 PM
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owning both it's not worth it. zf6 also has a trans cooler and you will need different driveshafts i believe

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post #6 of 10 Old 03-09-2013, 02:30 PM
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Shorten rear shaft, lengthen front shaft, ''massage'' the trans tunnel, add a trans cooler and lines, make a custom trans cross member, swap T-case.... if u already have a 5 speed, just rebuild it, or replace it with a 5 speed

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post #7 of 10 Old 03-09-2013, 09:32 PM Thread Starter
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Yea truck is already a 5 speed just doin a little think since overdrive is same ratio it really ain't worth it I got 4.10 so I was wanting lil higher overdrive and lower first put after I checked them I and saw them the same I purdy much changed my mind. Thanks for the help guys now I know I just gonna rebulid my zf5
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post #8 of 10 Old 03-10-2013, 03:52 AM
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I thought the ZF6 had a higher 6th gear too... but not much. Ive seen so much contradicting info on the gear ratio of the zf6 its crazy

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post #9 of 10 Old 03-11-2013, 05:52 PM Thread Starter
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From what I saw on one page overdrive is got same ratio on both but that was just one I saw chart
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post #10 of 10 Old 03-12-2013, 12:25 AM
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It's pretty close, something like .77 on the ZF5 and .72 on the ZF6. IIRC, the ZF6 also requires a pump and a cooler.
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