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Old 02-18-2019, 05:09 AM   #1
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Default Trucks with factory 31" tires

I am new to D21s, and am looking to buy one. I noticed that some trucks have 31" tires from factory and some have 235s. Do the factory 31" equipped trucks have any suspension or gearing differences, or is it just like a 235 equipped truck?
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Old 02-18-2019, 11:22 AM   #2
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forgot to mention, I am just looking at 4x4s
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Old 02-18-2019, 02:45 PM   #3
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Most 4x4 trucks were specced with 31s. I think it's easier to find an early one with 235s. The early 235 trucks may have a different axle ratio than the ones with 31s. Generally you'll find 4.3:1 and 4.6:1 axles. Both were available with the manual. Auto trucks, I believe, were the 4.6:1. Suspension should be the same.



My truck had 235s and I went to 31s. I have a 4.1:1 axle ratio. The change made my speedo dead on.
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Old 02-18-2019, 02:58 PM   #4
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I've got a '96 4x4
4.6:1 axle ratio with factory 235/75/r15 tires

I've got a spare set of Chevy rims that I am planning to put a new set of 31's on.
But that will make my speedometer read 65 MPH when I am really doing 69.5 MPH.
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Old 02-18-2019, 03:42 PM   #5
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My 86.5 5spd had 31s factory, 4.1:1 ratio. If you're looking for specific options looking up the VIN is the best idea. A lot of these trucks seem to have random options. Mine has just about everything you could get on the 86.5 but still has open diffs for instance.
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Old 02-19-2019, 07:20 PM   #6
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Thanks for the replies, I wound up pulling the trigger on an 88 SE 4x4 with the power options and 31s
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Old 02-19-2019, 08:48 PM   #7
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Pics or it didn't happen!
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Old 02-19-2019, 09:22 PM   #8
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Quote:
Originally Posted by Deerhurst View Post
Pics or it didn't happen!
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Old 02-19-2019, 11:51 PM   #9
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I pick it up on Friday, I will take pics!
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Old 02-21-2019, 05:18 PM   #10
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Last edited by normmus; 02-21-2019 at 05:25 PM.
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