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Old 07-04-2013, 11:29 AM
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6 speed swap

I have a 94 F-250 4x4 with a 7.3 powerstroke and the factory 5 speed trans. At some point in the future I plan to go through the engine and freshen it up a bit (325,000 miles but no major problems, just would like the peace of mind to know its all in good shape) and I would like to swap in a 6 speed. What I am wanting to know is what kind of issues am I going to have putting a ZF6 (?) newer model 6 speed in place of the 5? just looking at the two it would seem pretty straight forward, but wanted to ask prior too. Thanks

Kelly

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Old 07-07-2013, 12:20 PM
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Anyone ever done this swap? I know it can be done, I was just wondering if there was anything I needed to be prepared for?

Kelly
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Old 07-08-2013, 07:35 AM
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Can't help you, but I've gotta ask why? The reason for more gears is to keep an engine in it's powerband. The "peakier" an engine, the greater number of gears are needed. With a diesel, the powerband is so flat you could prolly get by with a 2 speed. Just curious...

Russ
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Old 07-08-2013, 09:19 PM
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Quote:
Originally Posted by S10xGN View Post
Can't help you, but I've gotta ask why? The reason for more gears is to keep an engine in it's powerband. The "peakier" an engine, the greater number of gears are needed. With a diesel, the powerband is so flat you could prolly get by with a 2 speed. Just curious...

Russ

Mainly my reason for the swap is the low first gear. The truck is geared 3.55 which I love for highway driving(22 mpg +/-), but it is a little hard on the clutch taking off with a load. With as many miles as it has, I figured instead of going through a rebuild on the 5 speed, I would swap in a lower mileage 6 speed with the low first gear, other than the low gear to get moving when loaded, the other gears are pretty much the same. I had a F-350 with the 6 speed and got spoiled by the low gear.

Kelly
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Old 07-09-2013, 05:17 AM
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Why not swap out that set of 3.55 gears for a 4.10 or 4.30, both of which are standard ratios for what I believe is probably the 10.25" differential(some are 10.5"). That 7.3 will seldom get into that second overdrive as it will be way below the power curve. My guess is that you will gain more useability with that higher numerical differential while losing little, if any fuel mileage - and that's a lot easier change then a transmission.
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Old 07-09-2013, 07:56 AM
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I don't think you guys are familiar with the transmission I am referring to. I think it is a ZF6, it's the transmission that ford used in the 99 up 7.3 and 6.0. It is basically a regular 5 speed like I have with a low first gear. I am happy with the gear set in the truck even though it is a bit high, the truck does great on the road, just would like to have a little lower first gear for taking off. Plus, I'd have to swap both gear sets because it is a 4x4 and I'd lose around 5 MPG on the road. I had a 97 exact same truck with 4.11 gears and it would barely get 17 MPG empty, I'm getting around 22 MPG empty. The heavy duty 5 speed that ford used in the 450's had a low first gear, but no overdrive, mine has a regular first gear and an over drive, the 6 speed I want is basically my transmission with a low first gear, no double overdrive like the T56 or other car transmissions. Thanks

Kelly
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Old 07-09-2013, 08:11 AM
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Ok guys I looked up the specs and just found out that a 6 speed first gear is 5.79 and my first gear is a 5.72, so I guess it wouldn't make any difference other than spacing the gears a little better to keep it in its power range, which isn't really a problem now. I guess it seemed so much lower in the F-350 because it was geared 4:10. Guess I'll consider other avenues, possibly a gear change as suggested, I just hate to give up the MPG because this truck isn't towing over 8-9,000 lbs on a regular basis, just every once in a while. Oh well back to the old drawing board..... Thanks for the input guys


ZF5 specs ZF 5 Speed Transmission Specs

ZF6 Specs ZF 6 Speed ZF S6-650 Specs


Kelly
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Old 07-09-2013, 09:08 AM
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Go retro, find an old 2-speed rear axle! Oops, never mind - high gear is 5.83 and low is 8.11. Maybe opt for a Gear Vendors OD with a 4.56 axle?

Russ
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