Ring & Pinion Gear Problems
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Junior User
Joined: Apr 2005
Posts: 77
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From: NE Illinois
Ring & Pinion Gear Problems
1999 F-250SD, 5.4, Auto, 2WD, SC, SB: My local shop replaced the 3.73 rear with a new 4.10, including using the parts kit, so all is new. The problem is the new rear makes a low but audible whine which increases in level as speed goes up. At 55mph it is apparent and an irritant. The noise changes with gas or coasting. The mechanic has tried for two days to adjust (shims), he says it just shifts the noise around. He told me the rear adjustment was 18/10,000 and should be 12-15/10,000. He is ordering new ring and pinion today and will try to install tomorrow. Figures the gears are bad. I need the truck this weekend to haul.
Also, do you recommend synthetic gear oil or like my mechanic he likes 80-90w and what is a good break-in for the new rear, before hauling and after? The trailer is 7K and GCVW is 14K+.
Also, do you recommend synthetic gear oil or like my mechanic he likes 80-90w and what is a good break-in for the new rear, before hauling and after? The trailer is 7K and GCVW is 14K+.
New User
Joined: Feb 2005
Posts: 17
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Sometimes you get an R&P setup where there is no ideal shim setup, one more shim is too tight, one less too loose. Did your shop go over break in with you? Hauling right off the bat is considered a bad idea, the gears need to be wear hardened and shouldn't be subjected to the heat of heavy loads or long trips. No towing is recommended for 500 miles, at which time it is also a good idea to change the gear oil because the new gears and bearings will throw a lot of metal. Then, when towing, repeat the procedure for the first 60 miles, stop every 15-20 miles and let everything cool down.
I've also had gears be a little noisy on setup, but after some break in they got quiet.
I've also had gears be a little noisy on setup, but after some break in they got quiet.
Mountain Pass
Joined: Jan 2004
Posts: 210
Likes: 1
From: Ixonia, WI
Might want to check your pinion bearing. Mine started whining at around 90,000 and I drove it like that till about 105,000. My buddy (drivetrain mech) and I popped the driveshaft off and found there was alot of play in my pinion. Turns out I'm glad I checked it out when I did cause it was cashed bad. Metal shavings all over in the rearend, he ordered a bearing kit for the 10.5 Sterling, (Pinion, and carriers with seals) we put the kit in and found that my driveshaft wouldn't quite fit back in. Apparently the kit was for a F-350 and the only difference between the F-350 rears and the F-250's at least in 99 was the pinion bearing. The new bearing that came in the kit is about 1/4 taller if you set it down flat on a table next to the bearing that was in my F-250. I had to special order a bearing from Timkin, the carrier bearings and everything else fit right in. To my suprise, my ring and pinion gears looked perfect yet so it's been nice and quiet for 15,000 mi now. The pinion bearings going is kind of a common issue at least in the 3/4 ton's. good luck
Post Fiend
Joined: Dec 2002
Posts: 6,245
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From: IL, USA
I agree with Paul_Sr.
I know with the PG gears that I have, their break in procedure is drive 15-20 miles easy, without any shock loads, then park the vehicle and let the axle assembly completely cool. Drive gently for the next 200 miles without any heavy loads. If trailer towing is intended an additional 200-300 miles break-in is required without the trailer. To properly break-in a new gear set, a minimum of 500 miles of driving is essential before constant towing.
If the procedure is not followed, overheating and eventual gear and/or bearing failure may result.
I followed those instructions and then changed the gear oil out after about 550 miles on the new gears.
Also, the proper backlash setting should be etched into the side of the ring gear....and listed in the instructions.
Playing around with the shims may take some time since so many different thickness shims are included in the install kit....but I'd think it could be gotten into the range given for the specified backlash.
I wonder how the tooth contact patterns look....
What brand of gears are they?
I know with the PG gears that I have, their break in procedure is drive 15-20 miles easy, without any shock loads, then park the vehicle and let the axle assembly completely cool. Drive gently for the next 200 miles without any heavy loads. If trailer towing is intended an additional 200-300 miles break-in is required without the trailer. To properly break-in a new gear set, a minimum of 500 miles of driving is essential before constant towing.
If the procedure is not followed, overheating and eventual gear and/or bearing failure may result.
I followed those instructions and then changed the gear oil out after about 550 miles on the new gears.
Also, the proper backlash setting should be etched into the side of the ring gear....and listed in the instructions.
Playing around with the shims may take some time since so many different thickness shims are included in the install kit....but I'd think it could be gotten into the range given for the specified backlash.
I wonder how the tooth contact patterns look....
What brand of gears are they?
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