Transmission problems OR Rear end problems

[bigpapad150]

How do you tell ???

When i get on the expressway I can't get over 55 miles an hour.

My truck starts drinking gas.

I think my transmission has O/D.( not working ???)

OR
Is it the rear end ??????

[dazedandconfused]

Give us specs on the truck. Engine, transmission, tire size and gear ratio if you know it along with rpm at certain speed.

[bmoeller]

Could be a fueling problem, or a fan clutch that is stuck on as well. Need more info. could be anything at this point.

[dazedandconfused]

His truck is a gas halfton i do believe.

[bmoeller]

If its a gasser, are the nuts for the carb tight? BTDT on an old Mazda B2000. Every time the screw came loose, no power!

[PToombs]

His truck is a gas halfton i do believe.

Well that explains it! If it had a Cummins it would go like hell!