squealingtires
New Member
- Joined
- Nov 6, 2007
- Messages
- 56
- Reaction score
- 0
- Points
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- Age
- 41
- Vehicle Year
- 1993
- Engine Size
- 4.0L OHV
- Transmission
- Manual
Maybe I'm getting too far ahead of myself with my self diagnosis. So let me start from the beginning. I've got my '93 4.0L ranger transmission (M5OD-R1) sitting on my workbench. Recently an unknown problem developed which resulted in the 5th gear malfunctioning. When in the 5th gear position the transmission acts as if it is in neutral (clutch engaged, of course). There is no sound that is produced that is different from when the transmission is in neutral The onset to the problem was the transmission "hiccuping" going in an out of 5th gear (this caused the truck to jerk several times with engine RPM jumping and falling). I recall it only acting up in this way about 4 times before 5th completely stopped working. All other gears (1-4+R) all work flawlessly and quietly.
Dissassembly observations: I removed the transmission from the truck, drained the gear oil and removed the top cover. No broken metal was found in the gearbox and all of the main gears were looking fine with light wear and no missing teeth.
5th gear inspection: Dog teeth look fine on the layshaft (I cant see inside the collar with out removal so that is still unknown. Then I moved the 5th and Reverse collar to engage 5th gear and the output shaft turns with the input shaft. This is opposite of how it acted in the truck. Then I though it might be associated with a warn out shifter so I put the cover back on and the shifter and the tranny is operating correctly.
Further inspection: Removed the tailshaft housing (4x4 model0 and everything still look great. I removed one of the plastic covers inside the tailshaft housing and I found lots of little black plastic pieces about 1/16" thick. What could this be? Maybe a shim that got chewed up and caused the collar not to engage 5th gear. But then, why would the transmission work when out of the truck. I need some help. Thanks.
last question: To inspect the 5th/Reverse collar I need to dissasemble the back of the tranny. How do I get the 2 blasted gear nuts off the two shafts in the tail housing? Should I lock the transmission into 1st and 3rd gear and put a pipe wrench on it? Will this damage anything?
All and any help is appreciated
Dissassembly observations: I removed the transmission from the truck, drained the gear oil and removed the top cover. No broken metal was found in the gearbox and all of the main gears were looking fine with light wear and no missing teeth.
5th gear inspection: Dog teeth look fine on the layshaft (I cant see inside the collar with out removal so that is still unknown. Then I moved the 5th and Reverse collar to engage 5th gear and the output shaft turns with the input shaft. This is opposite of how it acted in the truck. Then I though it might be associated with a warn out shifter so I put the cover back on and the shifter and the tranny is operating correctly.
Further inspection: Removed the tailshaft housing (4x4 model0 and everything still look great. I removed one of the plastic covers inside the tailshaft housing and I found lots of little black plastic pieces about 1/16" thick. What could this be? Maybe a shim that got chewed up and caused the collar not to engage 5th gear. But then, why would the transmission work when out of the truck. I need some help. Thanks.
last question: To inspect the 5th/Reverse collar I need to dissasemble the back of the tranny. How do I get the 2 blasted gear nuts off the two shafts in the tail housing? Should I lock the transmission into 1st and 3rd gear and put a pipe wrench on it? Will this damage anything?
All and any help is appreciated