No Movement in Reverse:
Though not a common problem to see with these transmissions it is one that can occur. There are not many components in the reverse system which rules out a lot of variables. The problems found that can cause reverse problems are - Poor sealing lip seal on the reverse apply servo, Worn reverse boost valve and sleeve, Partially blown channel plate gasket, overall low line pressure condition. These transmissions from the factory use a short design lip seal on the reverse servo. The aftermarket seal and gasket kits as well as Transgo include a long design lip seal which aids in some reverse problems, especially temperature related.