Final Drive Unit: Big Red
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Final Drive Unit: Big Red
The 85-87 250 Bigreds don't have the hi/lo/rev lever. The problem is probably the u-joint in the enclosed driveshaft assembly. Check the rubber boot on the driveshaft assembly (where it connects to the transmission) for cracks or tears that would let mud and water get into the driveshaft, that is a common problem on the 85-87 models.
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Final Drive Unit: Big Red
If there is a problem with the driveshaft u-joint, the rubber boot could be torn up or worn out and letting mud and water in. This is something that needs to be checked on these old machines, mine has never been replaced but I know of a few that have worn out and caused problems in the driveshaft assembly. This might not be your problem, but it is something to check.
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