'98 Amigo 4 cyl tire upgrade effect on gears

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'98 Amigo 4 cyl tire upgrade effect on gears

Postby Bmal53 » Sat Jan 16, 2016 11:16 am

I just picked up a bone stock '98 Amigo. It's a 5spd manual with the 4 cyl engine. I'm looking to go a little bigger on the tires and was wondering if I run 265/ 75 r16s on the stock rim would I have to change anything with the gearing? What would happen if I left everything else stock? Would anything get damaged? How much would the speedo be affected? How would it alter the performance? Thanks for any info
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Re: '98 Amigo 4 cyl tire upgrade effect on gears

Postby itsmehb » Sun Jan 17, 2016 9:05 am

You should move this question to a more suitable location. Like maybe, general questions or tire and wheels. Remember when you increase tire size you change the effective rear ratio. Larger tires mean higher rear ratio. I don't mean higher in number, It's actually lower in number but higher in ratio. Example, a 4.56 ratio is higher in number than say a 4.10, but the 4.10 is the higher ratio of the two. There's a lot of confusion about this.
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Re: '98 Amigo 4 cyl tire upgrade effect on gears

Postby Hack » Sun Jan 17, 2016 10:49 am

The 2.2l is underpowered for your nearly 2 ton truck. Going to a larger tire will make it a real dog. You won't like it!

That said, you would be adding about 3" or 10% to the diameter of the tire. So your speedo will read about 10% too slow, eg. You will be driving 66 mph when the speedo reads 60. Regearing will correct both problems. I do not know what gearing you have but if you are serious moving to a larger tire, you should start looking for the rare 4.78 gears for a Dana 44. They with will put the speedo spot on and restore most of the lost power if you have 4.30s and give you a bit more power with the speedo reading a bit high (4%) if you have 4.10s.
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RIP: 1999 2WD Amigo, Auto, 3.2L -- Engine blown and body damaged by Daughter #2. Parted out. Sent to crusher.
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Re: '98 Amigo 4 cyl tire upgrade effect on gears

Postby paulevans76 » Sun Jan 17, 2016 1:13 pm

Bmal53, you might already have the 4.77's since you've got the 2.2l 4x4. I think those are the models with that gear package. Your options plate might have the code to let you know for sure. If so, there's nothing deeper available anymore. Since you've got a manual, it's not as bad dealing with the larger tires, unless you do a hefty amount of highway driving. You'd not use 5th gear quite as much and you'll find yourself downshifting on hills more often.
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Re: '98 Amigo 4 cyl tire upgrade effect on gears

Postby Bmal53 » Tue Jan 19, 2016 10:49 pm

Thank you guys for all the helpful info.
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