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post #1 of (permalink) Old 11-15-2007, 12:38 PM Thread Starter
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Speedometer gears

Loking for some help here.
I have a 83 CJ7, 4.2L T5 tranny, Dana 300, running 33x12.50's 15"
Trying to get my speedometer closer to accurate. has anyone had any experence in iding the correct gear (tooth count) to adjust for this new tire size? OEM says they start at 24 and go to 45 teeth.

83 cj7, 258 .030 over, HEi dist, Howell TBI.
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post #2 of (permalink) Old 11-15-2007, 01:59 PM
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I have seen a chart on htis board showing the correct tooth count for calibration. Have you tried doing a search for speedometer gears?
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post #3 of (permalink) Old 11-15-2007, 02:29 PM Thread Starter
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yes i did, but did not see anything specific to a CJ7.

83 cj7, 258 .030 over, HEi dist, Howell TBI.
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post #4 of (permalink) Old 11-15-2007, 03:51 PM
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All I remember was for a TJ, but that was my interest. I don't know about a CJ. I'm sure someone will chime in.
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post #5 of (permalink) Old 11-15-2007, 03:53 PM
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Try this link. It's for a CJ Speedometer Gear Applet
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post #6 of (permalink) Old 11-15-2007, 04:19 PM
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My question for this topic... Do you change the input gear (speedo cable end) only, or do you need to remove the output shaft and put a new sleeve gear on the shaft for the speedo cable (2 gears needed, 1-shaft, 1-speedo cable)?
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post #7 of (permalink) Old 11-15-2007, 05:18 PM
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The gear is on the output shaft of the D300 xfer case.

Remove the cable, pull out the existing gear (remove the retaining bolt first)...count the # of teeth...then use the above info to determine what the new gear size needs to be.

But....before you do that.....

Are you running stock gears? If you are running those 33" tires with stock gears, you will burn up your clutch soon....it's about like starting out in 2nd gear. If you want to restore your jeep to normal performance...consider changing gears...then adjust your speedo...which by the way, will most likely be fine if you re-gear the axles.

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post #8 of (permalink) Old 11-15-2007, 06:52 PM
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You can buy a new speedo gear from any Chrysler Dealer for a few bucks, even for an old CJ. Use that calculator that Tom (upalittle) posted and go to the local dealer. It won't hurt much.

As for your clutch, what you talking about Dawg?


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post #9 of (permalink) Old 11-15-2007, 07:00 PM
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33" Tires? T5 Tranny? He most likely has stock gears...3.31 I believe.

It's not too bad to drive up to about 31" tires...but when you go to 33", it's about the same as trying to start off in 2nd gear with stock tires....you have to feather the clutch to get going....(talking from experience here). The tire size also changes the whole power band....I doubt he even uses 5th gear much...and I bet the jeep feels like it does not have as much power. Eventually you burn up the clutch.

Change that rear end to 4.10 gears and it will feel like a new jeep....

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84 CJ7, SOA, 5.7LTBI, 4L60E, 35"x12.5, 4.10 gears, F/Det, R/ARB, Full Roll Cage,
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post #10 of (permalink) Old 11-15-2007, 07:18 PM
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Quote:
Originally Posted by JeepDawg View Post
33" Tires? T5 Tranny? He most likely has stock gears...3.31 I believe.

It's not too bad to drive up to about 31" tires...but when you go to 33", it's about the same as trying to start off in 2nd gear with stock tires....you have to feather the clutch to get going....(talking from experience here). The tire size also changes the whole power band....I doubt he even uses 5th gear much...and I bet the jeep feels like it does not have as much power. Eventually you burn up the clutch.

Change that rear end to 4.10 gears and it will feel like a new jeep....
Sure it's much better to match the gears and tires (I've posted more replys..) but then I have first hand experience with 33" tires and a T5 with 3:31 gears. Not that big of a mismatch... til you get out on the highway.

Might just want to change both axles if you are going to change ratios.

Still a D30 front? Still AMC20 two piece axles? Might just go long before the clutch.

It's always something.


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