5-Speed to 4-Speed
#1
5-Speed to 4-Speed
I am getting ready to change the tranny in my 1988 300-6 from 5 speed manual to a 4 speed manual. My 5 speed lost reverse and I purchased a 1992 truck that had a blown head gasket but good transmission. Has anyone in this forum done this, and do you know of any potential problems, or shortcuts?
Any advice would be very helpful.
Any advice would be very helpful.
#3
#5
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#7
The 5 speed has an integral bell. 4 speed has a separate bell.
A 4 speed in '92?
Either a granny low, with 2-3-4 something like a 3 speed, with 4th direct. Gaps between gears will be wider, and no OD. So how did your 5 speed do in 4th? Because that is your new high gear.
If by chance it is the OD 4 speed, it is geared something like a 3 speed in 1-2-3, with a huge gap 2nd to 3rd, which you won't like much at first, but will grow to hate, and 4th is OD, similar to your 5 gear.
IMO, you should find another Mazda box, or a ZF.
Otherwise, you need to find a juice clutch set up bell, and face possible trans mount and ds issues.
The problem with your current trans might be as simple as shift forks. Top cover comes off to reveal these.
More gears, more better. As for what is a "better" trans, the granny iron case 4 speeds are stronger. The OD's are weaker.
Check the pics here. '92 should be Mazda or ZF 5 speed. Beats me:
http://www.motivegear.com/tech_info/...nny_guide.html
A 4 speed in '92?
Either a granny low, with 2-3-4 something like a 3 speed, with 4th direct. Gaps between gears will be wider, and no OD. So how did your 5 speed do in 4th? Because that is your new high gear.
If by chance it is the OD 4 speed, it is geared something like a 3 speed in 1-2-3, with a huge gap 2nd to 3rd, which you won't like much at first, but will grow to hate, and 4th is OD, similar to your 5 gear.
IMO, you should find another Mazda box, or a ZF.
Otherwise, you need to find a juice clutch set up bell, and face possible trans mount and ds issues.
The problem with your current trans might be as simple as shift forks. Top cover comes off to reveal these.
More gears, more better. As for what is a "better" trans, the granny iron case 4 speeds are stronger. The OD's are weaker.
Check the pics here. '92 should be Mazda or ZF 5 speed. Beats me:
http://www.motivegear.com/tech_info/...nny_guide.html
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#9
Yeah-the T18 four speed was an option for 1992 F150s . Per the dealer brochure and the Ford Service Manual. The fourth gear was direct and the first gear was a granny.
The C6 tranny was also available in the F150s in 92-per the Service Manual. But the 92 brochure doesnt show this.
If the shift tower of the M5R2 is removed-the forks come out with the shift tower. The shift tower can be removed from transmission without removing the transmission from the truck. Just remove the transmission floor plate around the shift lever from inside the cab. The floor covering has to be removed to access the transmission floor plate. Then remove the shift tower with the shifter and forks in it as an assembly.
The first gear in the M5R2 5 speed is 3.90:1. Overdrive is .80:1
The T18 first gear is something like 6.40:1. The T18 is a real truck transmission-as long as the truck isnt driven at high speeds, long distance in high gear (1:1). Henry realized this and wouldnt equip a T18 truck with any axle ratio lower than 3.55. No stock equipped 1992 T18 F150s with 4.10 gears in the axle.
The T18 is an improvement of the old T98A truck transmission of the fifties and early sixties.
The C6 tranny was also available in the F150s in 92-per the Service Manual. But the 92 brochure doesnt show this.
If the shift tower of the M5R2 is removed-the forks come out with the shift tower. The shift tower can be removed from transmission without removing the transmission from the truck. Just remove the transmission floor plate around the shift lever from inside the cab. The floor covering has to be removed to access the transmission floor plate. Then remove the shift tower with the shifter and forks in it as an assembly.
The first gear in the M5R2 5 speed is 3.90:1. Overdrive is .80:1
The T18 first gear is something like 6.40:1. The T18 is a real truck transmission-as long as the truck isnt driven at high speeds, long distance in high gear (1:1). Henry realized this and wouldnt equip a T18 truck with any axle ratio lower than 3.55. No stock equipped 1992 T18 F150s with 4.10 gears in the axle.
The T18 is an improvement of the old T98A truck transmission of the fifties and early sixties.
#10
#12
Too funny! And too true, too. Been there, done that--and will a 2.47 (Or was it a 2.41? It was the highest rear I'd ever even heard of, in any vehicle--ever) rear axle ratio, too!
#13
Gaps between gears will be wider, and no OD. So how did your 5 speed do in 4th? Because that is your new high gear.
If by chance it is the OD 4 speed, it is geared something like a 3 speed in 1-2-3, with a huge gap 2nd to 3rd, which you won't like much at first, but will grow to hate, and 4th is OD, similar to your 5 gear.
IMO, you should find another Mazda box, or a ZF.
I'd fix the Mazda, if I could, or get another one. They drive really well, IMO.
#14
Gaps between gears will be wider, and no OD. So how did your 5 speed do in 4th? Because that is your new high gear.
If by chance it is the OD 4 speed, it is geared something like a 3 speed in 1-2-3, with a huge gap 2nd to 3rd, which you won't like much at first, but will grow to hate, and 4th is OD, similar to your 5 gear.
IMO, you should find another Mazda box, or a ZF.
I'd fix the Mazda, if I could, or have it fixed, or get another one. They drive really well, IMO.
Good luck.
#15