New Gears are hot
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Freshman User
Joined: Mar 2003
Posts: 39
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New Gears are hot
I recently installed new ring and pinion (355) and a Loctrac unit from Randy's Ring and pinion.I was wondering about 2 things.
1) Everything seems to work fine,no noises or anything,but my rear diff gets so hot you cant touch it.It says in the book to drive it about 15 miles and let it cool.I did that.I have a little over 200 miles on it now.When I drive it ,it gets really hot.IS this normal for a new gear set and bearings.I went by the book when I put it together.
2) I have 33" tires but the speedometer was calibrated with my old gears (308).So how much should my speedometer be off now?
1) Everything seems to work fine,no noises or anything,but my rear diff gets so hot you cant touch it.It says in the book to drive it about 15 miles and let it cool.I did that.I have a little over 200 miles on it now.When I drive it ,it gets really hot.IS this normal for a new gear set and bearings.I went by the book when I put it together.
2) I have 33" tires but the speedometer was calibrated with my old gears (308).So how much should my speedometer be off now?
Posting Guru
Joined: Jul 2002
Posts: 2,205
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From: Vancouver WA
New Gears are hot
Your speedo shouldn't be off. The speedo gets it's signal from a sensor on the rear axle AFTER the ring and pinion. The only thing that will affect the calibration of the speedo is changing to a different tire height.
Senior User
Joined: Feb 2000
Posts: 482
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From: Connecticut
New Gears are hot
A few years ago I installed 4:10's an ARB and new bearings in my 8.8. I noticed the same high heat, hot enough to get burned if you held your hand on the case long enough. I asked someone knowledgeable with gear installation and I seem to recall 160-180 degrees C was an acceptable oil temp. I think I called the gear manufacturer (US Gear) and got the info. No problems yet with about 40,000 miles on them.
Mark
Mark
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