In this thread: One of our ihon customers, Jesse b. Has ordered up a 'built' tf 727. Part of that package included a request for the installation of a transgo tf-2 shift reprogramming kit. In Jesse' thread you will see an entire 727 valve body disassembled down to the last part. That is necessary in order to verify that the core valve body is surgically clean and has no issues whatsover. If I'm installing a tf-2 kit into a functional valve body that is not contaminated, it's not necessary to tear it down that far for installing the system. This valve body core is a 'full throttle kickdown' version which is by far the most common unit used in all ihc apps through the eop of of the '76 stuff.
You can install a shift kit in an 07. You would just need to have the PCM reprogrammed at a shop that specializes in performance mods. I'm pretty sure that's the case. Because the PCM controls solenoids that operate valves to shift into different gears. Transgo may have a kit with a reprogrammer but it' probably not cheap.
General Motors
Though it's entirely possible that someone has modded an earlier valve body using a 'partial throttle kickdown' module. Some '77 and later sii use the partial throttle kickdown system, I have no preference for one over the other. In the last several months, transgo has completely revamped this kit as compared to what they have supplied since 1975 or so. This kit is not designed for 'ease of installation' and I'd highly recommend that it be installed only by a slushbox tranny pro that is experienced with the 727 box. The instructions have been majorly re-worked (but not for the better!), you must have a complete service reference also in order to tear into the valve body, the instructions will definitely leave ya hanging!!! Some of the mods that were done with the earlier versions of this kit are no longer performed, instead.other changes have been incorporated in order to make this kit applicable to all versions of the 904/727 three speed unit (with or without a lockup converter which ihc never incorporated in any truck tranny).
Ihc also never used the 904 version of a torqueflite. Idea here is to give you an overview of what is involved in the installation of a tf-2 kit. There a few additional parts that must be installed in the transmission itself.in order to do that you must have the tooling needed to r&r the low/reverse servo and be very familiar with the process of doing so to prevent damaging any seal rings or rubber lip seals. There is much more attention to detail involved in upgrading the valve body than is covered in this short how-to.the instructions do not go into that detail so I'm not going to either! This is not a step-by-step/in exact order kinda deal.each kit install will be somewhat different depending upon how far the assembly was torn down. But if anyone is interested in attempting to do one of these upgrades on their own, I'm willing to work with ya as always! This first pic shows the separator plate marked for attention.
There are many versions of this plate over the years!!! And you must make a positive id regarding which plate you are working with in order to perform the correct mods. The steps here involve drilling out various holes using the appropriate drill bit size that is supplied in the kit. Regarding this valve body upgrade, Jesse has requested the the 'shift command' feature be activated. This mod allows the transmission to be manually downshifted into any gear.at any speed!!!!! In other words.at 60mph you can stick into manual 1st and expect some dire consequences!
There is an advantage or two to this feature in an offroad sitch if the driver is aware of the feature. And I do use this feature on my own rig when pulling the trailer onna backcountry/super-hilly logging road with a rock surface. It's saved my ass more than once onna downhill! So the 12 governor valve gets a major grind job. It's best to cut this valve down inna lathe, but it can be done by hand grinding and is very time-consuming.
I grind these down by chucking inna drill motor and spinning, while using a grinding stone in a dremel. The actual dimensions for cutting this valve down are not super-critical. Now we're gonna actually start the re-assembly of the valve body. You must pay close attention to the instructions which pertain to the exact valve body being upgraded.
There are several variations/combinations of check balls to be installed here, including eliminating one or two if specified. After all the cutting/grinding/fitting of the sub-components has been completed, all parts are cleaned meticulously once again just before re-assembly. There can be no debris or contamination on any part or down inside any channel. The moving parts are an extremely close tolerance fit in their respective bores and even microscopic particulate will prevent this unit from functioning properly.
The prv retainer has been juggled into position here and the mounting screws tightened. Once that's done, the pressure regulator adjustment screw is set according to a spec provide in the instructions.
That setting will vary depending upon the end use of the transmission/vehicle that this kit is installed in. This one has been set for jesses' described vehicle use, the only reason to ever change it is for drag strip use only in a full blown launch with a full race transmission.not hardly a Scout II's forte'.
Distributors
In this thread: One of our ihon customers, Jesse b. Has ordered up a 'built' tf 727. Part of that package included a request for the installation of a transgo tf-2 shift reprogramming kit.
In Jesse' thread you will see an entire 727 valve body disassembled down to the last part. That is necessary in order to verify that the core valve body is surgically clean and has no issues whatsover. If I'm installing a tf-2 kit into a functional valve body that is not contaminated, it's not necessary to tear it down that far for installing the system. This valve body core is a 'full throttle kickdown' version which is by far the most common unit used in all ihc apps through the eop of of the '76 stuff. Though it's entirely possible that someone has modded an earlier valve body using a 'partial throttle kickdown' module. Some '77 and later sii use the partial throttle kickdown system, I have no preference for one over the other. In the last several months, transgo has completely revamped this kit as compared to what they have supplied since 1975 or so.
This kit is not designed for 'ease of installation' and I'd highly recommend that it be installed only by a slushbox tranny pro that is experienced with the 727 box. The instructions have been majorly re-worked (but not for the better!), you must have a complete service reference also in order to tear into the valve body, the instructions will definitely leave ya hanging!!! Some of the mods that were done with the earlier versions of this kit are no longer performed, instead.other changes have been incorporated in order to make this kit applicable to all versions of the 904/727 three speed unit (with or without a lockup converter which ihc never incorporated in any truck tranny). Ihc also never used the 904 version of a torqueflite. Idea here is to give you an overview of what is involved in the installation of a tf-2 kit.
There a few additional parts that must be installed in the transmission itself.in order to do that you must have the tooling needed to r&r the low/reverse servo and be very familiar with the process of doing so to prevent damaging any seal rings or rubber lip seals. There is much more attention to detail involved in upgrading the valve body than is covered in this short how-to.the instructions do not go into that detail so I'm not going to either! This is not a step-by-step/in exact order kinda deal.each kit install will be somewhat different depending upon how far the assembly was torn down.
But if anyone is interested in attempting to do one of these upgrades on their own, I'm willing to work with ya as always! This first pic shows the separator plate marked for attention. There are many versions of this plate over the years!!! And you must make a positive id regarding which plate you are working with in order to perform the correct mods.
The steps here involve drilling out various holes using the appropriate drill bit size that is supplied in the kit. Regarding this valve body upgrade, Jesse has requested the the 'shift command' feature be activated. This mod allows the transmission to be manually downshifted into any gear.at any speed!!!!! In other words.at 60mph you can stick into manual 1st and expect some dire consequences! There is an advantage or two to this feature in an offroad sitch if the driver is aware of the feature.
And I do use this feature on my own rig when pulling the trailer onna backcountry/super-hilly logging road with a rock surface. It's saved my ass more than once onna downhill!
Contact
So the 12 governor valve gets a major grind job. It's best to cut this valve down inna lathe, but it can be done by hand grinding and is very time-consuming. I grind these down by chucking inna drill motor and spinning, while using a grinding stone in a dremel. The actual dimensions for cutting this valve down are not super-critical. Now we're gonna actually start the re-assembly of the valve body.
You must pay close attention to the instructions which pertain to the exact valve body being upgraded. There are several variations/combinations of check balls to be installed here, including eliminating one or two if specified. After all the cutting/grinding/fitting of the sub-components has been completed, all parts are cleaned meticulously once again just before re-assembly. There can be no debris or contamination on any part or down inside any channel. The moving parts are an extremely close tolerance fit in their respective bores and even microscopic particulate will prevent this unit from functioning properly. The prv retainer has been juggled into position here and the mounting screws tightened.
Once that's done, the pressure regulator adjustment screw is set according to a spec provide in the instructions. That setting will vary depending upon the end use of the transmission/vehicle that this kit is installed in. This one has been set for jesses' described vehicle use, the only reason to ever change it is for drag strip use only in a full blown launch with a full race transmission.not hardly a Scout II's forte'.