Manual Transmission question
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Freshman User
Joined: Jan 2007
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Manual Transmission question
I have a 1989 f-250 7.5l 4x4 with a five speed manual transmission. I would like to convert this trans to 4x2 and put the engine and transmission in my 1953 f-100. My question is it even possible to take the transfer case off and put a 4x2 tailhousing on the trans and what about gear ratios because i really wouldn't need granny gear anymore. Any info would be greatly appreciated. Also what Exact trans do I have and do the same 4x2 transmissions have different gear ratios. I wrecked the f250 and bought it back from the insurance company for the motor and drivetrain because it was unharmed. Again thanks in advance for any info.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Your truck has a ZF five speed, which has the same gear ratios for both the 4x4 and 4x2 versions. I'm not sure if there's a way to eliminate granny gear, though, but with the 7.5, it might allow you to run a pretty tall rear gear in your 53 to help with fuel mileage on the highway.
The F450's from that year used a 4x4 transmission, even on the 4x2 trucks, so getting it to work on a 4x2 truck is easier than trying the other way around. You can install a parking brake assembly from an F450 on to the back of a 4x4 ZF, which will make it work in a 4x2 application without having to change output shaft and tail housing.
The F450's from that year used a 4x4 transmission, even on the 4x2 trucks, so getting it to work on a 4x2 truck is easier than trying the other way around. You can install a parking brake assembly from an F450 on to the back of a 4x4 ZF, which will make it work in a 4x2 application without having to change output shaft and tail housing.
Post Fiend
Joined: Oct 2003
Posts: 6,214
Likes: 13
From: New Jersey
The only way to eliminate the granny gear is to install numerically lower rear axle gearsets, making 1st gear more useful. Of course this doesn't change the large jump between 1st and 2nd so that might become annoying.
Most everyone just doesn't use 1st gear unless towing, starting on a steep hill, or sitting in NJ traffic where idling at 2mph is appropriate while you sip coffee.
Most everyone just doesn't use 1st gear unless towing, starting on a steep hill, or sitting in NJ traffic where idling at 2mph is appropriate while you sip coffee.
