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Unread 08-08-2010, 12:40 PM   #1
WJOverland
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Speedo Gear Question?

What will i need to switch to after going to either of these two tire sizes

265/75R16
and
265/70R16

Transmission is a 46RE and the axles have stck 3.73 gearing.

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Unread 08-08-2010, 12:51 PM   #2
narnwv
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There isn't a speedo gear in the WJs.
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Unread 08-08-2010, 01:03 PM   #3
tsconver
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it is controlled off the abs tone rings, so any gearing changes will not impact the speedo.

I find that 31" tires are just a little too big and the speedo reads about 1 mph too low and 29.5 tires are a little too small and read about 2 mph too fast

A dealer with a DRBIII scan tool can tweak the speed a little but not much
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Unread 08-08-2010, 02:14 PM   #4
WJOverland
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this is for my 98 ZJ though. the WJ is staying at stock UpCountry Height
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Unread 08-08-2010, 04:13 PM   #5
ratmonkey
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you'll be off by something like 10%, not enough to change imo.
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Unread 08-08-2010, 09:13 PM   #6
Yardman Harry
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You will need 31 tooth for 31s and 32 tooth for 32s.

Speedometer Re-Gearing


when i went to 265/70/16 i was reading about 7 mph under actual speed.
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Unread 08-08-2010, 09:14 PM   #7
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Quote:
Originally Posted by ratmonkey View Post
you'll be off by something like 10%, not enough to change imo.
agreed since those things are close to 80 bucks now...
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1996 Jeep Grand Cherokee. V8 - 5.2 litre 242 SelecTrac. SURCO Safari Roof Rack
Hunter Green


1997 Jeep Wrangler Sahara Ed. I6 - 4.0 litre, 4" SL, D44 rear, 4:56 Gears, AA SYE with double cardon custom rear Drive Shaft, IRO Adj CAs, Kevins Rear Adj TB with JOHNNY JOINT end

1999 Mazda Miata MX5 - Jet Black

1990 Jeep Cherokee Sport I6 - 4.0 litre
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Unread 08-09-2010, 12:44 AM   #8
WJOverland
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the ZJ is being put together with quite a high standard for mechanical and interior quality, and fit and finish therefore, I want the speedo to be as accurate as possible.


Thanks for the link yardman, much appreciated.
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1998 ZJ 5.9L Limited (Dark Slate Grey) 79k & Counting
I want a CJ-8 Scrambler.
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