Transmission
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New User
Joined: Nov 2005
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Transmission
I have an 85 f350 6.9 4spd 4.10s rollback. I have the trans out because the rear main seal was NG. I am looking for a 5spd because it is tough on the highwayand that's where I drive the most. Does anybody have one or have any sugestions. I'm' in north GA. Thanks.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
ZF 5 is the only option.
Warning, the toughest T 19 to ZF 5 swap I ever saw was in a roll back.
PTO drive for the hydraulics was the biggest challange.
The drive shaft length was the second challange.
There were two different ZF 5 transmissions behind the diesel.
The first model was the ZF 5 S 42 which is a lighter duty transmission. This is the one the roll back guy here was installing.
The second model was the ZF 5 S 47 which is a heavier duty transmission.
Three low gear options with both models, 4.14, 5.08 and 5.76.
Overdrive was either .76 or .77 in all three ratios.
Warning, the toughest T 19 to ZF 5 swap I ever saw was in a roll back.
PTO drive for the hydraulics was the biggest challange.
The drive shaft length was the second challange.
There were two different ZF 5 transmissions behind the diesel.
The first model was the ZF 5 S 42 which is a lighter duty transmission. This is the one the roll back guy here was installing.
The second model was the ZF 5 S 47 which is a heavier duty transmission.
Three low gear options with both models, 4.14, 5.08 and 5.76.
Overdrive was either .76 or .77 in all three ratios.
Thread Starter
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New User
Joined: Nov 2005
Posts: 5
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Transmission
Thank's. I know about the zf5 so I'm thinking that I'll change the rear end. I hate to loose that low end. With this dana I can only go to 3.54. Not much of of a diference. maybe higher tires. Any feedback would be great. Thanks. Brian.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
If you don't need lower gears as well as higher gears an overdrive unit is ideal.
You get almost the same cruising speed that a ZF would give, price is about the same as it would cost to install the ZF after you bought it and you would have 8 forward gears plus two reverse. Splitting the gears would great with a load on.
www.usgear.com
www.gearvendors.com
I would probably go with the gear vendors unit if I were getting one, it looks like a lot less work to install in a 4x4. Only have to cut one driveshaft.
I have a similar problem with my 4 speed, but I have 3.55 gears with 33" tires and need a lower first gear as well as the overdrive. I tow and haul heavy loads in the mountains.
Since mine is a 4x4 the cost of lower gears in the rear ends plus the cost of the overdrive unit would be to much.
I also looked into the six speed, but I would not have had a speedometer. By the time the six speed was used in Fords the speedo pickup was in the rear axle. The six speed transmission and transfer case do not have provisions for a speedometer drive. It is a much heavier built transmission than the 5 speed is, which was another concern about the ZF 5.
All the salvage yard around here have both the 5 and 6 speed gear boxes, I was quoted 2500 for a six speed with transfer case and 1200 for a five speed.
You get almost the same cruising speed that a ZF would give, price is about the same as it would cost to install the ZF after you bought it and you would have 8 forward gears plus two reverse. Splitting the gears would great with a load on.
www.usgear.com
www.gearvendors.com
I would probably go with the gear vendors unit if I were getting one, it looks like a lot less work to install in a 4x4. Only have to cut one driveshaft.
I have a similar problem with my 4 speed, but I have 3.55 gears with 33" tires and need a lower first gear as well as the overdrive. I tow and haul heavy loads in the mountains.
Since mine is a 4x4 the cost of lower gears in the rear ends plus the cost of the overdrive unit would be to much.
I also looked into the six speed, but I would not have had a speedometer. By the time the six speed was used in Fords the speedo pickup was in the rear axle. The six speed transmission and transfer case do not have provisions for a speedometer drive. It is a much heavier built transmission than the 5 speed is, which was another concern about the ZF 5.
All the salvage yard around here have both the 5 and 6 speed gear boxes, I was quoted 2500 for a six speed with transfer case and 1200 for a five speed.
Last edited by Dave Sponaugle; Nov 20, 2005 at 09:46 PM.
