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Old 03-19-2008, 10:46 AM
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6spd swap

my buddy has a 97 350 w/ a 5spd stage two inj., and a ts chip. he found a 6spd out of a super duty and would like to switch it with his. has anyone done this will it bolt up, do we have to modify alot of stuff, any help would be great thanks in advance
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Old 03-19-2008, 11:08 AM
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Old 03-19-2008, 11:43 AM
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It should bolt up to the engine, no problem. A new cross member will probably have to be made. The shifter will probably work. The hydraulic clutch system should work also, but I haven't looked at the 6spd too closely. The slave cylinder may be a little different. You may or may not be able to use your clutch, depending on the clutch splines, and if you have to use a SD clutch, you may have to use a SD flywheel also. I have never got past the thinking part on this.

My question is, why does he want to swap? If it's for "better mileage" or "higher gear" don't do it. Even though it is a 6spd, it does not have an "extra" over drive gear like some people think. The over drive ratios are almost identical.

If the ZF5 in the truck is bad, and he wants to replace it with the ZF6 then it would probably be worth the time, if he got a good deal on the 6.

I just don't want someone to do this and find out the ratios are close. If I ever run across a deal on a 6spd, I plan on doing the swap, because my 5spd is grinding.
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Old 03-19-2008, 07:56 PM
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The 6er also uses a tranny cooler, you'd need the lines and cooler, or fab up you own. As pipelayerjdh has said, the only primary gearing difference is the extra "granny gear" and the 6 speed is designed to handle a little more torque than the 5 speed.
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Old 03-19-2008, 08:35 PM
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The granny gear is nice when you have a really heavy load, but other than that it will hardly ever get used.
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Old 03-20-2008, 07:37 AM
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ya and my buddy said his synro in 2nd are starting to go and he wants a six b/c it shifts faster and smoother?
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