trans options
Thread Starter
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Cross-Country
Joined: Jul 2018
Posts: 59
Likes: 0
From: Olympia, WA
trans options
Hey all, need a little help.
I am looking to "upgrade" the transmission, it was just rebuilt but i am not happy with the work and it isn't right, shifts up points are close to prior rebuild, it doesn't seem to down shift well. I am just tired of taking it back they don't seem to fix my concerns.
Anyways back to the question what can i stick behind my 400? I tried to use the search but can't seem to get specifics.
Thanks all.
I am looking to "upgrade" the transmission, it was just rebuilt but i am not happy with the work and it isn't right, shifts up points are close to prior rebuild, it doesn't seem to down shift well. I am just tired of taking it back they don't seem to fix my concerns.
Anyways back to the question what can i stick behind my 400? I tried to use the search but can't seem to get specifics.
Thanks all.
More Turbo
Joined: Jun 2020
Posts: 648
Likes: 394
From: Montana
C6(automatic), NP435(manual), T18(manual), T19(manual), ZF5 (manual, with some mods)... It sounds like you have an automatic so if that is the case, obviously you would need to figure out a clutch pedal etc. to make a manual work. I don't know enough about what automatics were available to know if there are others that would fit.
Also, here's another thread about a similar subject:
https://www.ford-trucks.com/forums/4...-400-351m.html
Also, here's another thread about a similar subject:
https://www.ford-trucks.com/forums/4...-400-351m.html
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
Would be nice to know what transmission you have to start with.
What work was done to the transmission?
If it was a stock rebuild I cant see the shift RPM being raised.
Shift kits that I have installed did not raise the shift RPM it just firms up the shifts.
Depending on the kit and the level used it will be a nice firm shift or could be "bark the tires & break U joints" firm!
Like above I am guessing a C6 trans and it would use a vacuum modulator.
I think they can be adjusted to change shift points a little but you should Google that to make sure before making changes to it.
I also want to say it may have a governor and this would also control shift RPM. Again Google that to make sure before making changes to it.
I have a non-Ford car now with a shift kit installed, it uses a rod from the carb to the trans to tell it how much load is on it.
I have the rod adjusted so it will shift at normal RPM.
The kit will shift at normal RPM and with a little more firmness with normal street driving but if you give it more throttle the shift RPM does go up some and dose the firmness.
Foot to the floor the shift RPM is pretty high and the firmness is "tire barking" and I have a locker in the rear.
Dave ----
What work was done to the transmission?
If it was a stock rebuild I cant see the shift RPM being raised.
Shift kits that I have installed did not raise the shift RPM it just firms up the shifts.
Depending on the kit and the level used it will be a nice firm shift or could be "bark the tires & break U joints" firm!
Like above I am guessing a C6 trans and it would use a vacuum modulator.
I think they can be adjusted to change shift points a little but you should Google that to make sure before making changes to it.
I also want to say it may have a governor and this would also control shift RPM. Again Google that to make sure before making changes to it.
I have a non-Ford car now with a shift kit installed, it uses a rod from the carb to the trans to tell it how much load is on it.
I have the rod adjusted so it will shift at normal RPM.
The kit will shift at normal RPM and with a little more firmness with normal street driving but if you give it more throttle the shift RPM does go up some and dose the firmness.
Foot to the floor the shift RPM is pretty high and the firmness is "tire barking" and I have a locker in the rear.
Dave ----
Lead Driver
Joined: Oct 2018
Posts: 7,877
Likes: 2,365
The C6 was a great transmission and there's no reason to switch unless you're looking for a manual or an overdrive.
I'd go to another shop , one run by a guy with a reputation for building performance transmissions. there are still a lot of them out there and these guys know how to make things do what you want them to, they don't just follow the training they got on how to replace parts.
I'd go to another shop , one run by a guy with a reputation for building performance transmissions. there are still a lot of them out there and these guys know how to make things do what you want them to, they don't just follow the training they got on how to replace parts.
Thread Starter
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Cross-Country
Joined: Jul 2018
Posts: 59
Likes: 0
From: Olympia, WA
Thanks all, sorry yes it is a c6 3 speed auto. Full rebuild. I was hoping to drop in a 4 speed maybe 5 counting OD.
The truck sounds like the trans is vibrating against the underside when in drive. It only seems to do that when its hot and i come to a complete stop.
The 4 wheel doesn't shift smoothly anymore either. If there is the slights of pressure on the trans i have to rock the stick to get in and out of 4 wheel.
I feel like the alignment is off now. I am just grasping at a guess but not sure.
The truck sounds like the trans is vibrating against the underside when in drive. It only seems to do that when its hot and i come to a complete stop.
The 4 wheel doesn't shift smoothly anymore either. If there is the slights of pressure on the trans i have to rock the stick to get in and out of 4 wheel.
I feel like the alignment is off now. I am just grasping at a guess but not sure.
Lead Driver
Joined: Oct 2018
Posts: 7,877
Likes: 2,365
The rough shifting might be how they set it up or most likely it's because they put a shift kit in it. I hate them and I always make sure to tell them not to install one. I'm not drag racing.
The vibration could be many things. I'd look for anything the messed with bumping somewhere.
try shifting the transfer case with the trans in neutral as you're rolling a little. . if you're just sitting in neutral autos can have a little drag that causes problems
You should be able to put a 4OD behind your 400 since 460's had them. I'm sure someone here knows. I doubt it's cheap or easy.
The vibration could be many things. I'd look for anything the messed with bumping somewhere.
try shifting the transfer case with the trans in neutral as you're rolling a little. . if you're just sitting in neutral autos can have a little drag that causes problems
You should be able to put a 4OD behind your 400 since 460's had them. I'm sure someone here knows. I doubt it's cheap or easy.
Thread Starter
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Cross-Country
Joined: Jul 2018
Posts: 59
Likes: 0
From: Olympia, WA
The rough shifting might be how they set it up or most likely it's because they put a shift kit in it. I hate them and I always make sure to tell them not to install one. I'm not drag racing.
The vibration could be many things. I'd look for anything the messed with bumping somewhere.
try shifting the transfer case with the trans in neutral as you're rolling a little. . if you're just sitting in neutral autos can have a little drag that causes problems
You should be able to put a 4OD behind your 400 since 460's had them. I'm sure someone here knows. I doubt it's cheap or easy.
The vibration could be many things. I'd look for anything the messed with bumping somewhere.
try shifting the transfer case with the trans in neutral as you're rolling a little. . if you're just sitting in neutral autos can have a little drag that causes problems
You should be able to put a 4OD behind your 400 since 460's had them. I'm sure someone here knows. I doubt it's cheap or easy.
The truck shifts smoothly but the downshifts are not there. At 30ish mph im in 3rd gear even with 1.5t of wood in a trailer. to be honest im pretty soft with the loud pedal.
The 4x4 that doesn't shift like butter anymore. Before the rebuild it was butter. Sitting at a 45deg hill i could shift in and out of 4x4 hi lo.
If i am on level ground and in neutral i can shift ok but not smooth, still feels like i am shifting a tractor.
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Lead Driver
Joined: Oct 2018
Posts: 7,877
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If you had noticeable downshifts before something was modified. maybe it's just shifting correctly now. 727's, TH400's , C6's none of them had downshifts like the new transmissions do unless you manually pulled them down.
If you want to change your upshift points some of that is in the modulator. if yours isn't adjustable you can put an adjustable one on cheap and easy and set them.
Also be sure your kickdown linkage is working correctly. it will cause stack shifting and all kinds of problems. I'd think your shop would have taken care of all this but it might be worth double checking.
as far as your transfer case goes nothing in the transmission can effect that unless it's dragging in neutral . put your transmission in neutral and rev the engine up and see if you want to move at all. if you do go to your shop and if you don't it's in your transfer shift mechanism not the transmission.
If you want to change your upshift points some of that is in the modulator. if yours isn't adjustable you can put an adjustable one on cheap and easy and set them.
Also be sure your kickdown linkage is working correctly. it will cause stack shifting and all kinds of problems. I'd think your shop would have taken care of all this but it might be worth double checking.
as far as your transfer case goes nothing in the transmission can effect that unless it's dragging in neutral . put your transmission in neutral and rev the engine up and see if you want to move at all. if you do go to your shop and if you don't it's in your transfer shift mechanism not the transmission.
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Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
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From: Northwest
Transmission:
Manual
One that American parts (new / used) can be procured for.
Settle on the one that meets your needs and then get a spare unit to hold in reserve.
Get a service manual for that transmission.
Go with your gut feeling..... Opinions are a dime a dozen.
You have to make it work. When you are broke down on the side of the road.... No one is coming to help you.
Hobo
Manual
One that American parts (new / used) can be procured for.
Settle on the one that meets your needs and then get a spare unit to hold in reserve.
Get a service manual for that transmission.
Go with your gut feeling..... Opinions are a dime a dozen.
You have to make it work. When you are broke down on the side of the road.... No one is coming to help you.
Hobo
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william_ace
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