c6 to 5spd
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From: New London, Mo
c6 to 5spd
i have an 87 f250 with a 6.9 it has a c6 in it now and i wana put a 5spd in it what are some problems i would run into i know i would have to put a different steering colum would the 4wd shifter be in the same spot? thanks justin
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Joined: Nov 2003
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From: Nutter Fort, WV
There are two different diesel ZF 5 transmissions, the S42 and the S47.
Which one you get will determine the work that needs done.
You will need,
pedal set out of a manual equipped truck
a clutch master and slave cylinder as well as the line between them.
A shifter boot
And a hole in the tunnel for the shifter to go through.
You will probably have to relocate the cross member
And you may have to have the driveshaft made shorter.
If the truck you get the ZF 5 out of is a 4x4 and the same wheelbase as your truck, get the driveshaft with the transmission.
You can drive the pin out of the shift lever for the automatic, remove the lever and still use the same steering column.
The 4 wheel drive shifter should be exactly where it is now.
Which one you get will determine the work that needs done.
You will need,
pedal set out of a manual equipped truck
a clutch master and slave cylinder as well as the line between them.
A shifter boot
And a hole in the tunnel for the shifter to go through.
You will probably have to relocate the cross member
And you may have to have the driveshaft made shorter.
If the truck you get the ZF 5 out of is a 4x4 and the same wheelbase as your truck, get the driveshaft with the transmission.
You can drive the pin out of the shift lever for the automatic, remove the lever and still use the same steering column.
The 4 wheel drive shifter should be exactly where it is now.
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Posting Guru
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From: New London, Mo
i think im out of luck finding one the same wheel base its an ext cab and ive never seen a factory 5spd in one would i have everything if i found a wrecked complete donor truck?
Post Fiend
Joined: Oct 2007
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From: Faibanks Ak.
I scrapped a 91 ext cab with a zf5sp so they made them don't know how popular they were.you will hahe to use duall mass flywheel (yuk) or a luk replacement.
take the whole pedal assembly out of donor pu not sure what years work install new bushings.get all hydrolic parts from donor. the six speeds were later model dont know if bellhousings are same I am sure somebody here knows as that would be sweet.
take the whole pedal assembly out of donor pu not sure what years work install new bushings.get all hydrolic parts from donor. the six speeds were later model dont know if bellhousings are same I am sure somebody here knows as that would be sweet.
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From: Nutter Fort, WV
The six speed will bolt up to an IDI block.
The problem with them is there is no provision for a speedometer on either the transmission or the transfer case.
The ZF 6 has a larger output shaft, so you have to swap transfer cases if you have a 4x4.
By 99 when the ZF 6 was used, all speedometers were driven electrically from the rear axle housing.
On a pre 92 truck, using a ZF 6 requires changing the rear axle and a dash rework to have a speedometer.
92 and after that have the electronic speedo driven off the rear axle would be much easier to swap a ZF 6 in.
The problem with them is there is no provision for a speedometer on either the transmission or the transfer case.
The ZF 6 has a larger output shaft, so you have to swap transfer cases if you have a 4x4.
By 99 when the ZF 6 was used, all speedometers were driven electrically from the rear axle housing.
On a pre 92 truck, using a ZF 6 requires changing the rear axle and a dash rework to have a speedometer.
92 and after that have the electronic speedo driven off the rear axle would be much easier to swap a ZF 6 in.
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Post Fiend
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From: Faibanks Ak.
dave I have a friend that invented and markets a thing called a gearmaster it's purpose is to teach people to drive big trucks for older noncomputerized trucks he mounts a sensor on the driveshaft unit mounts on dash approx. 1 in high 6 in long progammed for gear ratio and tire size speedometer gives exact roadspeed.
I have watched this thing worh it is amazing would be an easy speedometer fix for 6sp conversion.
I have watched this thing worh it is amazing would be an easy speedometer fix for 6sp conversion.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
The six speed is a much tougher tranny than a five speed is.
Stronger case for the first thing.
Bigger gears and shafts inside as well.
Lower first gear ratio wise, higher overdrive ratio also.
The ZF 6 has an oil pump where most of the ZF 5 lubrication is splash.
Also the input shaft is much larger, so you need to change clutches.
1.375" input shaft if I remember right.
Do be aware, the last time I priced one locally, they were going between 2500 and 3000 dollars at salvage yards.
And you do have to swap transfer cases to a 283 if you have 4x4, the output shaft is much larger.
Starmilt, where can I find info on that device?
I did a web search with nothing close to what you are describing coming back.
Stronger case for the first thing.
Bigger gears and shafts inside as well.
Lower first gear ratio wise, higher overdrive ratio also.
The ZF 6 has an oil pump where most of the ZF 5 lubrication is splash.
Also the input shaft is much larger, so you need to change clutches.
1.375" input shaft if I remember right.
Do be aware, the last time I priced one locally, they were going between 2500 and 3000 dollars at salvage yards.
And you do have to swap transfer cases to a 283 if you have 4x4, the output shaft is much larger.
Starmilt, where can I find info on that device?
I did a web search with nothing close to what you are describing coming back.
Last edited by Dave Sponaugle; Oct 22, 2007 at 09:35 PM.
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
dave the website is www gearmaster.com If you want to talk to the guy that invented it I can get his number or email for you he also trucks all 49 states I'msure he would install 1 when the area this thing is amazing within 30 minutes anybody I mean anybody can **** a truck without grinding gears.