Chevy Transmission Problems Solved
this Article is only about Classic Chevrolet Vehicles
The transmission is of the selective type, having three speeds forward and one reverse. It is composed of a countershaft on which are keyed three gears and a main or splined shaft, on which two gears slide, which by a lengthwise movement can be made to engage the gears on the countershaft.
The most frequent source of annoyance is in having the gears jump out of engagement. This is usually produced by one or more of the following causes:
Gears not meshed deep enough, causing the load to be carried on a part of the teeth only. In making the gear shifts always be sure, before engaging the clutch, that the gear-shift lever has been moved as far forward cr backward as it will go without straining. If this is not done the edges of the teeth will become beveled, and in time it will be impossible to keep the gears engaged.
Worn gear shift rods or weak plunger springs.The gear-shift forks are attached to two sliding shafts.There are three notches to each shaft, which are so spaced as to correspond with the different gear-shift positions. In time the edges of these notches become worn so that the plungers do not secure a proper “grip.” Also the plunger springs weaken. By removing the floor boards and watching the action of these shafts and noting the “play” between the gear-shift lever and the rods a fair idea of the trouble may be gained.
Observation will also show the location of the plungers, which can be removed by unscrewing.
Bent gear-shift forks.
The shifting forks may be bent, not allowing the gear to come fully in mesh with the companion gear. To determine this, place the shifting lever in the position of the speed desired, then remove the cap screws which hold the transmission cover in place and raise the cover. You can then readily determine from the position of the sliding gear, its relation to the companion gear.
Loose or worn sliding gears.
Occasionally the sliding gears will become loose on the spline shaft, allowing the gears to canter or cock on the shaft.
This condition is brought about by excessive wear produced by lack of proper lubrication, and is best detected by having the gears jump out of mesh when passing over rough spots, or when coasting. Replacement of the gears or shaft is the only remedy.
If transmission becomes noisy or grinds when the motor is running idle with the clutch engaged, it may be due to the transmission being out of alignment with the motor. The main drive shaft bearing being worn or broken or idle gear bushing may be worn.
Replacing Worn Parts
Normal wear will in time require the renewal of bearings and bushings.
Chevy Transmission Problems Solved Article Source – This article courtesy should goes to : Chevrolet Repair Guide of 1923 by Chevrolet Motor Company.