Posted this over on the 70 side and have gotten zero traction, I figured since the A442 transmission was used in diesel 80s, I might try and see if anyone over here has any experience with what I'm seeing because I'm out of ideas. I recently imported an HZJ74 with the A442F automatic transmission. After importing, I drove it across a couple states, put approximately 1k miles over about 2 months and everything was working great. It's a super clean gem with only 84K miles on the clock and in terrific condition. As I proceeded through doing a baseline and replacing all fluids as I typically do, I ended up getting around to doing a drain and fill on the transmission. Immediately afterward, the transmission was no longer fully operational. When put into drive, you only have access to 3rd gear (possibly 4th, it's hard to tell). If 2nd is selected, there is no change. If L is selected, it will go into first with no issue. It will also go into reverse with no issue. Shifting back into D, you are then again limited to 3rd gear only. From a stop, if you start out in L and then shift to 2 or D it will bypass 2nd and immediately go into the 3rd. Overdrive is also lost. 2nd start also has no effect.
Again, prior to the drain and fill, the transmission worked great and was driving around with zero issues. Smooth sequencing through all the gears, no slippage, no flaring, no shuddering. I'm at a bit of a loss here on why it's not going through the gears, why it will let you do 1st if manually selected, or why it seems to want to stay in the upper gear. Pulling the pan, the magnets are clean and not a spec of glitter.
Things that I have tried.
Replaced solenoids and transmission filter with brand new OEM
Pin to pin continuity check
Transmission speed sensor replaced
ECT computer swapped
All grounds have been checked and cleaned
None of these have changed the symptoms at all.
Has anyone had this experience or know of someone that has? If so, what ended up fixing the problem? My next shot in the dark will be to replace the valve body, but again I'm just guessing at this point.
Again, prior to the drain and fill, the transmission worked great and was driving around with zero issues. Smooth sequencing through all the gears, no slippage, no flaring, no shuddering. I'm at a bit of a loss here on why it's not going through the gears, why it will let you do 1st if manually selected, or why it seems to want to stay in the upper gear. Pulling the pan, the magnets are clean and not a spec of glitter.
Things that I have tried.
Replaced solenoids and transmission filter with brand new OEM
Pin to pin continuity check
Transmission speed sensor replaced
ECT computer swapped
All grounds have been checked and cleaned
None of these have changed the symptoms at all.
Has anyone had this experience or know of someone that has? If so, what ended up fixing the problem? My next shot in the dark will be to replace the valve body, but again I'm just guessing at this point.