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post #1 of (permalink) Old 07-23-2009, 10:04 AM Thread Starter
 
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Question 4banger with 33" tires

so if I put 33" tires on my 4cyl, the take off is going to suck. But I read that the gear box can be regeared to accommodate this. Does anyone know if this is true, and also how to find a good shop to do it in socal? What type of questions will I need to ask the mechanic to make sure he knows what he is doing?
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post #2 of (permalink) Old 07-23-2009, 10:41 AM
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Well, you can regear the differentials. If you want to see what that will feel like, get your 33" tires on ..and just forget 5th gear. That should just about simulate/duplicate/immitate 4.88 gears. You'll still have the same issues on getting it moving ..but I don't think that is as much of a challenge as breaking 60 on the highway.

Gary L. Allan, Sr.
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post #3 of (permalink) Old 07-23-2009, 11:22 AM
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33-inch tires are 10% taller than the 30s you probably have now, so it might be bearable, depending on the transmission and type of driving you do.

Re-gearing the differentials can get pricey by the time you buy two ring gears, two pinion gears, all the bearings and seals, which aren't absolutely necessary but probably a good idea, and pay the labor you'll be into some serious change - could be a couple grand. It might be cheaper to replace the back axle with a Ford Explorer 8.8 that already has the gearing you want. The 8.8 is a WHOLE bunch stronger.

BTW, it's been said that 31s will rub on a stock TJ, so 33s will require a lift or some serious fender trimming.

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post #4 of (permalink) Old 07-23-2009, 12:12 PM
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He'll surely require different back spacing on the wheels. I figure he's going with 12.50" cross section. He can get by with just adjusting the steering stops if he goes with 10.50. It will look like a pregnant roller skate without a lift.

He already has 4:10 gearing. He needs 4.88 to get back to stock. I wasn't aware that 8.8 Exlorer axles came in that ratio. I've seen 3.73 and 4:10. But you're right, if he could find one, it would probably be cheaper if this is a YJ. A TJ will require the welding kit for the brackets and buckets.

If he can still find any 33x9.50r15 BFG Mall Terrains, all he needs is a budget boost and steering stop adjustments.

Gary L. Allan, Sr.
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post #5 of (permalink) Old 07-23-2009, 12:32 PM
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I've read about there being some tall gears in the Explorers, but don't recall exactly what is available. They're all too new for me to pay much attention to.

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post #6 of (permalink) Old 07-24-2009, 07:21 AM
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I was running 29.50 stock tires when I bought my 1995 YJ. They were worn out, bald to say the least, springs were flat, hit the rubber bumpers every time I hit a bump in the road. I changed the springs to a 2.5 RE extreme lift, did a SYE kit, re-abgled my rear, new pads, welded them on, new shocks, then went with a 31 X 10.50 tire. It all but almost killed first gear but when it gets rolling I can do quite well on the road, its just the BIG hills that slow me down. If I want to go higher I have a 1990 YJ and it has the RE 4.5 extreme lift, 35's and a 5.0 engine, I just get into that and motor on down the pike. 33's are a bit to tall without re-gearing both rears.

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