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Re: 1991 CHEVROLET SILVERADO 2500HD 7.4 Litre 4x4 tow...
You can pull the boat no problem. as putting in a 6.2 for the 454 you will need to change wire harness inside and out..im the brake booster...... the gear ratio in the rear ends ..fuel pump ..im guessing you have a truck you will be using for parts.. if you are doing for fuel mileage you will be disappointed you will only gain a couple of mpg .. hopes this helps
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This is just a personal opinion after working on GM trucks for 27 years, but I wouldn't tow anything bigger than a 6 foot trailer with a small lawn mower with a 1/2 ton v-6. They are just not built for it.
the gvwr is the calculated weight the the truck can carry in the cab and the bed combined, it is not the towing capacity, the towing capacity can be found in your owners manual. I hope this helps you, good luck !
The kind of fluid needed is called GLS this is not something you can get at some grease and go. To my knowledge this particular fluid is still a dealer only item. DO NOT put ATF in your transfer case. I don't remember the capacity but the dealership would have this information.
is it a gas or a diesel? its commen for the gas motor to get really crappy millage try with the tow button off and the shifting should improve, but the gas try changing the air filter to a k&N or something better like it