zf5-zf6 swap - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 11-05-2012, 05:22 PM Thread Starter
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zf5-zf6 swap

how hard would this swap be? Really need a 6th gear lol.

1997 F250,5spd,4x4

Looking for TS6 and 3" DP
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post #2 of 19 Old 11-05-2012, 06:53 PM
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Well, first off overdrive gear in both is about the same ratio just the ZF6 has a much lower first gear. I have driven several ZF6 speed trucks and unless you are towing heavy in the hills first gear is rarely used. If you still want to swap you need a different clutch disc, your transfer case will not fit so then when you use the superduty transfer case your driveshafts won't fit, will need the trans cooler and lines and I believe a different clutch slave cylinder.

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97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
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post #3 of 19 Old 11-06-2012, 04:20 PM Thread Starter
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Soo.. realistically. Not worth it...? Just so high of rpms at 70 and at 3lbs of boost.

1997 F250,5spd,4x4

Looking for TS6 and 3" DP
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post #4 of 19 Old 11-06-2012, 04:25 PM
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Realistically, no because overdrive ratio will not change. What gear ratio and size tire are you running? What rpm's are you turning at 70?

Jack
97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
1.0 housing w/ wwII, 203* t-stat, diy 6637, 4" exhaust
Diy intercooled, 6.0 fan, Diy 140v Idm, Isspro Ev gauges
On board air, E-fuel, 6" lift on 35's
322000 miles
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post #5 of 19 Old 11-07-2012, 07:31 AM
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subbed for info...70 with 4.10's is not fun IMO

1996 F250 XL 7.3 PSD ZF5 Red SCLB ...79k miles and show room stock

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post #6 of 19 Old 11-07-2012, 07:43 AM
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the zf6 has a slightly lower OD and not as far of a gap between the 3-4 shift.. let me see if i can find numbers

EDIT.....let me try to find numbers from ZF and not off a forum, but here they are

The ratios for the ZF6 are as follows:
Low gear 5.79
1st gear 3.30
2nd gear 2.10
3rd gear 1.31
4th gear 1.00
overdrive 0.72

The S5-42 IDI trans
1st Gear: 4.14
2nd Gear: 2.37
3rd Gear: 1.42
4th Gear: 1.00
5th Gear: 0.77

The S5-47 95-97 trans is
1st Gear: 5.08
2nd Gear: 2.60
3rd Gear: 1.53
4th Gear: 1.00
5th Gear: 0.77

And the wide ratio version of both is:
1st Gear: 5.72
2nd Gear: 2.94
3rd Gear: 1.61
4th Gear: 1.00
5th Gear: 0.76


edit... conflicting info
1st = 5.79, 2nd = 3.31, 3rd = 2.10, 4th = 1.31, 5th = 1.00, 6th = 0.76 Reverse = 5.23

FRANK THE TANK
DIY INTAKE - HYDRA CHIP - MARTY'S E-FUEL - 250/200s
05 AXLE SWAP 3.73 - 2.5" PURE PERF. LIFT COILS - FOX SHOCKS
BTS TRANS - TYMAR DOWN PIPE - 4" EXHAUST
Waiting To Be Installed... gtx4294r, studs, springs, HPOP?
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You are so smart Frank, I dont care what Terry says.

Last edited by ol_Blue97; 11-07-2012 at 07:55 AM.
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post #7 of 19 Old 11-07-2012, 01:42 PM
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i have both and i agree low is pretty much useless. and you will need a different trans cross member.

i also have 4.10s and have no issues, then again i almost never hit 70

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #8 of 19 Old 11-07-2012, 04:36 PM
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Not to steal the thread but how about changing the diffs to 3.73? I drove a 5 speed the other day with 4.10 and at 70 i was at 2500 rpm. My 2x4 with 3.55 sits at 2300rpm at 85. I was thinking about doing a gear swap had I bought the truck. And what would you be looking at rpm wise with 3.73s? at 70?

Clint

96 F-250 4x4 ECLB

Current mods: DIY 6637, CCV mod, gauges, 3" DP to 4" exhaust, 6 pos chip, E-fuel, D60 swap with PMF 2.25" RSK
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post #9 of 19 Old 11-07-2012, 04:53 PM
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I wonder how a zf6 would be with 3.55s and 35s or similar... that low to first shift is difficult on the 6 speed tho..

FRANK THE TANK
DIY INTAKE - HYDRA CHIP - MARTY'S E-FUEL - 250/200s
05 AXLE SWAP 3.73 - 2.5" PURE PERF. LIFT COILS - FOX SHOCKS
BTS TRANS - TYMAR DOWN PIPE - 4" EXHAUST
Waiting To Be Installed... gtx4294r, studs, springs, HPOP?
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You are so smart Frank, I dont care what Terry says.
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post #10 of 19 Old 11-07-2012, 05:17 PM
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Quote:
Originally Posted by judgesblind View Post
Not to steal the thread but how about changing the diffs to 3.73? I drove a 5 speed the other day with 4.10 and at 70 i was at 2500 rpm. My 2x4 with 3.55 sits at 2300rpm at 85. I was thinking about doing a gear swap had I bought the truck. And what would you be looking at rpm wise with 3.73s? at 70?
there is a formula out there to give you this, i used to know it but have forgotten it.

and frank that shift is not easy

and pulling hills with 3.73 weight in at 20K+ lbs is not fun either the phrase no balls comes to mind. i really wish that dump truck had 4.10s

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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