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Old 07-06-2012, 06:44 PM   #1
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Has to be my tranny? Right

Just bought this Jeep and got a deal because it needed a new tranny. When I back up it makes a clunk, clunk and keep doing it as long as I am moving. Doesn't matter if clutch is engaged or not. This is a 99 with the 4.0 and manual transmission. Just seems odd that it is only in reverse. All forward gears work perfect. Haven't got under Jeep yet but this should be a AX-15 right.

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Old 07-06-2012, 06:59 PM   #2
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Syncros ???

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Old 07-06-2012, 07:18 PM   #3
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I do not know much about transmissions but the reverse gear is not a synchronized gear. That is why it helps before you shift to the reverse gear shove it into 3rd so it can sync.
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Old 07-06-2012, 07:20 PM   #4
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Quote:
Originally Posted by ljjp10 View Post
Just bought this Jeep and got a deal because it needed a new tranny. When I back up it makes a clunk, clunk and keep doing it as long as I am moving. Doesn't matter if clutch is engaged or not. This is a 99 with the 4.0 and manual transmission. Just seems odd that it is only in reverse. All forward gears work perfect. Haven't got under Jeep yet but this should be a AX-15 right.

97-99 AX-15 behind the 4.0. Since reverse has its own interm shaft, an idler gear, and so on, it isn't odd to me to just have rev problems.

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Syncros ???
Reverse doesn't have syncro's. It has 2 gears to their own shaft and an Idler gear that falls between them when reverse is selected.
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Old 07-06-2012, 07:22 PM   #5
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And thats why im not a mechanic lol and im in the navy
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Old 07-06-2012, 07:56 PM   #6
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It doesn't matter wether I put in a forward gear then shift to reverse or not. Still makes its noise.

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