Changing gears
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Senior User
Joined: Jun 2003
Posts: 434
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From: Hawaii
Changing gears
I'd like to replace the 3.55 gears on my truck with 3.73 because of larger tires. Do I need to replace the front (4X4) also or can I get by with only changing the rear?
Post Fiend
Joined: Feb 2000
Posts: 11,496
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From: Kansas
Changing gears
Going from a 3.55 to a 3.73 will not provide a big difference. It was a couple of years ago or so that a similiar thread was developed. The upshot was that it takes a bigger swap in gears to get a change. Like a 3.55 to a 4.11. 3.31 to 3.73 would also be a good one. For that much expense, be sure that's what you want.
New User
Joined: May 2003
Posts: 17
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Changing gears
265/75 should be about 10.4" wide at their widest point. The sidewall should be 7.8 inches tall, resulting a total diameter on the rim of 31.6"
305/70 should be about 12" wide. The sidewall should be about 8.4 inches tall, resulting a total diameter on the rim of 32.8"
These are estimates based on the numbered sizes and will vary a little according to the manufacturers toloranes.
total circumferance on the 265/75 would be 99.22" while on the 305/70 it would be 102.99"
265/75 would rotate about 639 times per mile
305/70 would rotate about 615 times per mile
I would leave the 3.55 considering the substantial expense. I am not sure now the speedometer on these trucks is driven but it will probably read 4-5% slower than your actual speed after the tire change based on the calculations above.
305/70 should be about 12" wide. The sidewall should be about 8.4 inches tall, resulting a total diameter on the rim of 32.8"
These are estimates based on the numbered sizes and will vary a little according to the manufacturers toloranes.
total circumferance on the 265/75 would be 99.22" while on the 305/70 it would be 102.99"
265/75 would rotate about 639 times per mile
305/70 would rotate about 615 times per mile
I would leave the 3.55 considering the substantial expense. I am not sure now the speedometer on these trucks is driven but it will probably read 4-5% slower than your actual speed after the tire change based on the calculations above.
