I believe I have about an 81 Montgomery ward garden tractor with rear end problems. The only tag with numbers is under the seat. It says it is the model and serial numbers but I can not come up with any information on it. The numbers are: mdl- 139 498 054 and ser- 81 2269 D129C. The 8 in the ser # is scratched in half, might be a 3 , 8 , or a B. there is no deck, has a 11 hp B&S, I believe the engine is original. The rear end is a gear drive H pattern with a hi lo along side the seat. The rear end has broke "spiders gears" in the differential. (Two small gears on a short shaft inside the ring that drives the two gears on the axle shafts. Any help or info would greatly be appreciated.