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I'll nevAr go single!
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994 Posts
Discussion Starter #1
Ok, speedo is off, want to correct it with a tire size change if possible.

1JZ with R-154 and 4.30 Diff. Trans thinks it has a 4.10 diff, Says G294 on the firewall plate, correct me if im wrong on that.

What could I change my tires to to help correct it? I'm getting new ones soon anyway so no would be the time.
 

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4,627 Posts
do you have the old tranny? Swap the damn plastic gears.

How are the FAL's working for you?
 

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I'll nevAr go single!
Joined
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994 Posts
Discussion Starter #5
225/50/16 factory size currently.

I dont have the old trans. And I read before that the gear thing mite not swap from a W58 into a R-154, thats why I bring up this question.

FAL's going 1 year strong with not a single issue (But only 2.5K miles in that time, I dont drive it much)
 

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1,480 Posts
Your speedometer should be reporting about 5% slower than actual? To get it reporting properly you need smaller tires. 4.878% smaller to be exact.

225/40/16 will get you close, the speedo will report 2% higher than actual.
235/40/16 will have the speedo reporting about 1% high.
215/45/16 will have you about as close as you're going to get.

And no, a R154 sending gear won't fit the W58... it's too small. However, you might try contacting the folks at MarlinCrawler, they may be able to find a compatible gear that would work.
 
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