"I have a 1999/2000 model ram 1500 4x4 with 5.5 in factory lift and I need to know if it would have come from the factory with 265/75r 16s or if i should go with the 225/75r 16s which is stated on the door. Because I believe that the 265/75r 16 spare is original.
No & why? The lift with oversized tires are better. Don't worry about the spare. The 265's are only a little bit wider than stock 225's. (35 mm) I would go bigger with that lift like 275X55XR17 off road tires. (BFG all terrain) 18's, 19's, or 20's. Sport trucks & 4X4's now use 20" wheels! Check Discount Tire Co. & or online they're good with plus size tires & custom wheels.
Yes I understand but with a tire that has a larger circumference it changes the gear ratio which in turn put more strain on the transmission. The reason Im concerned is because I have heard that some of the dodge transmissions were light duty and weak.
A 75R is a 75R, & a 16 is a 16, (the same circumference or tire higth) you're confused. A 265 to a 225 is just a little bit wider. Measure the overall tire higths. A 60 series would be not as tall, & increase the gear ratio. Makes sence? Smaller tires spin faster.
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