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post #1 of 8 Old 08-05-2006, 09:30 AM Thread Starter
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5 to 6 spd

Hey Guys.
Anybody out there know if there is a 6spd manual that will replace a 5 spd manual? Would the swap be difficult? Is the overdrive ratio better on a six speed? I have already swapped my 4.10's for 3'55's but I need to get some more MPG. Thanks

96 F250 7.3
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post #2 of 8 Old 08-05-2006, 04:52 PM
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I don't know how hared the swap would be since they are both ZF's I would think it wouldn't be too hard. On the 6spd's 5th and 6th are both overdrive and 6th is taller that 5th in a 5spd

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post #3 of 8 Old 08-05-2006, 06:44 PM
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if you ever figure out how to do that i would love to know i have a 97 f250 5 speed!!! when you changed your rear how many mpg's did yu get better? how much did it cost you fo the new rear?
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post #4 of 8 Old 08-05-2006, 07:06 PM
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have you given any thought to the gear vendors under/overdrive?? Might be more cost effective than buying a ZF6

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1994.5 F-350, PSD, 5spd, Crew cab, 2wd, DRW
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post #5 of 8 Old 08-05-2006, 08:30 PM Thread Starter
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Quote:
Originally Posted by scooby53
if you ever figure out how to do that i would love to know i have a 97 f250 5 speed!!! when you changed your rear how many mpg's did yu get better? how much did it cost you fo the new rear?
I went from approx. 12 to 16 mpg. It was worth the bucks! The gears were right around $200, it's the bearings that will really set you back.
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post #6 of 8 Old 08-05-2006, 08:33 PM Thread Starter
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Quote:
Originally Posted by fordnut85
have you given any thought to the gear vendors under/overdrive?? Might be more cost effective than buying a ZF6

I left out the fact that my truck is a 4x4. I wouldn't guess that an auxilary overdrive would work.
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post #7 of 8 Old 08-05-2006, 08:55 PM
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An auxillary overdrive unit would work, so long as you don't have the truck in 4 wheel drive with it engaged. The only problem is that the boxes become the weak link in the driveline, and if you tow a lot and/or do some spirited driving, you can expect to break it. As far as the tranny swap, anything is possible although I can forsee it being a big pain in the butt. I think the 6 speed is longer, so the tranny crossmember would have to be moved, and the driveshafts would have to be lengthened/shortened. I've thought about doing this swap in my truck, just haven't had the time or money to jump into it.

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post #8 of 8 Old 12-06-2006, 06:51 PM
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I had a 96 with the 5 speed, and now an early 99 with the 6 speed. The OD ratio on the 5 speed was .77:1. The OD ratio on the 6 speed is .72:1. Not much difference. The low gears are nearly the same as well. The only thing the 6 speed gives you is more choices.

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