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Old 03-25-2015, 06:27 PM   #7726
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I just reposted my 1 star review on amain. Will be interesting to see how long it lasts before being deleted.
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Old 03-25-2015, 06:31 PM   #7727
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I just reposted my 1 star review on amain. Will be interesting to see how long it lasts before being deleted.
I agree with you! as once you get your part then you can change your review if you like.
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Old 03-25-2015, 06:35 PM   #7728
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I just reposted my 1 star review on amain. Will be interesting to see how long it lasts before being deleted.
pretty shady on amain's part
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Old 03-25-2015, 06:41 PM   #7729
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I just reposted my 1 star review on amain. Will be interesting to see how long it lasts before being deleted.
I agree that i will posted 1 star review till not get my replacement parts. I call RCamerica and they said didn't get any replacement.
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Old 03-25-2015, 08:39 PM   #7730
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Recently upgraded my xb4 '14 to the steel pinion and bevel gears and am having some issues with the front dif. It's making a grinding sort of noise only noticeable when under load on the ground. I've checked that everything is tightend and appears to be correct but the noise persists. Any help or advice would be appreciated.
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Old 03-26-2015, 12:39 AM   #7731
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You broke the axle or the bone?
Thanks very much Norse, this car has done nearly 5 seasons on carpet....about 3 weeks ago I snapped both rear bones....put the proper Xray ones in and now just snapped one front bone and the other side isn't far behind. Ill give those Spec R double jointed as I use them in my touring car and there are heaps of benefits.
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Old 03-26-2015, 02:53 AM   #7732
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does any one who is running the center diff after like 4min of 5min race it starts to feel soft? running 8-100-8 in diffs in 13.5 class.haven't refilled diffs since i put together about 8 race nights.
Thank you. I thought it was me. I'm guessing it's heating up and thinning out a little. I went to 200k and same thing. I read bentkas post and he said the lowest they run is 500k. The lower oils don't allow you to push it As hard as we want. I just put the 500 In last night so after this weekend I'll get back atcha with results . I don't think it has anything to do with rebuilding the diff . There designed to be good for along time.
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Old 03-26-2015, 05:56 AM   #7733
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Recently upgraded my xb4 '14 to the steel pinion and bevel gears and am having some issues with the front dif. It's making a grinding sort of noise only noticeable when under load on the ground. I've checked that everything is tightend and appears to be correct but the noise persists. Any help or advice would be appreciated.
You might want to replace the bulkhead and the diff case as well, perhaps the diff isn't seated firmly enough and it moves around. When I switched to the steel gears in my 14 I had a problem with the rear diff leaking, tried lots of stuff but eventually just replaced the diff case itself and the problem went away.
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Old 03-26-2015, 08:26 AM   #7734
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Recently upgraded my xb4 '14 to the steel pinion and bevel gears and am having some issues with the front dif. It's making a grinding sort of noise only noticeable when under load on the ground. I've checked that everything is tightend and appears to be correct but the noise persists. Any help or advice would be appreciated.
Grinding under load is a good indication that the front pinion gear is chipped or has broken teeth.
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Old 03-26-2015, 08:58 AM   #7735
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Im running a 2015 Xb4. I currently have a 8.5t in it and want to go to a 6.5t is there a chart anywhere for what size pinion I should use. I have been racing associated stuff since the summer and am used to having the sheets in the book that show the size you should start with and go from.
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Old 03-26-2015, 09:09 AM   #7736
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I would drop 2-3 teeth
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Old 03-26-2015, 09:20 AM   #7737
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Thanks very much Norse, this car has done nearly 5 seasons on carpet....about 3 weeks ago I snapped both rear bones....put the proper Xray ones in and now just snapped one front bone and the other side isn't far behind. Ill give those Spec R double jointed as I use them in my touring car and there are heaps of benefits.

No problem Daniel
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Old 03-26-2015, 09:31 AM   #7738
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Im running a 2015 Xb4. I currently have a 8.5t in it and want to go to a 6.5t is there a chart anywhere for what size pinion I should use. I have been racing associated stuff since the summer and am used to having the sheets in the book that show the size you should start with and go from.
Stock spur is the same on xb4 and b44.3 81t i'm running 19t pinion on the b44 with a 6.5 so going start out with the same on the xb4.
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Old 03-26-2015, 09:36 AM   #7739
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It's always tricky to recommend gearing because no one knows your track but you. Start with the stock 81T spur and run either an 18 or 19 tooth with your 6.5 and keep an eye on your temps. If you run a really small, tight track, you could try the 84T spur and maybe a 20 or at max a 21 tooth pinion. Watch your temps.
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Old 03-26-2015, 09:43 AM   #7740
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Originally Posted by jmackani View Post
Grinding under load is a good indication that the front pinion gear is chipped or has broken teeth.
Gears are all good.

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You might want to replace the bulkhead and the diff case as well, perhaps the diff isn't seated firmly enough and it moves around. When I switched to the steel gears in my 14 I had a problem with the rear diff leaking, tried lots of stuff but eventually just replaced the diff case itself and the problem went away.
This is what I'm thinking. I've tried shimming and everything else short of replacing the dog bone and it still does it so this is my next course of action. Thanks.
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