Good morning,
I would start by changing the fluid and filter in the transmission. If the filter is clogged, it will not shift.
Beyond that, it could be the governor in the transmission which controls the shifting.
https://www.2carpros.com/articles/automatic-transmission-problems
Roy
The governor assembly can be removed for reconditioning or replacement without removing the transfer gear cover, transfer gear and governor support. To remove governor, drain transmission fluid and remove transmission oil pan. Remove valve body, unbolt governor from governor support, then remove governor.
When cleaning or assembling the governor assembly, ensure governor valves move freely in governor body bores.
1. Remove rear cover attaching bolts and rear cover.
2. Using transfer shaft gear tool No. L-4434 or equivalent, remove transfer shaft gear retaining nut, Fig. 3.
3. Using transfer shaft gear puller tool No. L-4407 or equivalent, remove transfer shaft gear and shim, Fig. 4.
4. Remove governor support retainer, then remove low-reverse band anchor pin.
5. Remove governor assembly.
6. Remove transfer shaft retainer snap ring, then using transfer shaft and bearing retainer removal tool No.L-4512 or equivalent and a suitable puller, remove transfer shaft and retainer assembly.
7. Remove transfer shaft retainer from shaft.
8. Using a screwdriver, remove oil seal from transfer shaft retainer.
9. Using suitable tool, tap oil seal into shaft retainer.
10. Reverse procedure to install. Torque transfer shaft gear retaining nut to 200 lb-ft.
Images (Click to enlarge)
Apr 24, 2019 at 3:54 AM
