Speedo Gear Question? - JeepForum.com

 
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post #1 of 8 Old 08-08-2010, 11:40 AM Thread Starter
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.


2003 WJ Overland (Brilliant Black Crystal Pearl Coat) 76k & Counting
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post #2 of 8 Old 08-08-2010, 11:51 AM
narnwv
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There isn't a speedo gear in the WJs.
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post #3 of 8 Old 08-08-2010, 12:03 PM
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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post #4 of 8 Old 08-08-2010, 01:14 PM Thread Starter
WJOverland
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this is for my 98 ZJ though. the WJ is staying at stock UpCountry Height

2003 WJ Overland (Brilliant Black Crystal Pearl Coat) 76k & Counting
1998 ZJ 5.9L Limited (Dark Slate Grey) 79k & Counting
I want a CJ-8 Scrambler.
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post #5 of 8 Old 08-08-2010, 03:13 PM
ratmonkey
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you'll be off by something like 10%, not enough to change imo.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #6 of 8 Old 08-08-2010, 08:13 PM
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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post #7 of 8 Old 08-08-2010, 08:14 PM
Yardman Harry
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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...

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
White
~Junked~
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post #8 of 8 Old 08-08-2010, 11:44 PM Thread Starter
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.

2003 WJ Overland (Brilliant Black Crystal Pearl Coat) 76k & Counting
1998 ZJ 5.9L Limited (Dark Slate Grey) 79k & Counting
I want a CJ-8 Scrambler.
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