Hey guys heres the scenario a buddy off mine rear end is needing some repair. His rear end was making nasty noises an clunks so he new something was wrong. After removing the rear cover he seen the damage. The pinion gear is stripped an bearing shot. This truck has a lift on it an is running 35s on it. He pulls pretty good loads with it quite a bit. Im thinking with 4.10 gears he has an trying to turn those big tires with a load its a bit much for the rear to take. My question is this what should he do next. I dont want his to happen to him again. Give me your input here guys. Any or all ideas welcome. Thanks a lot for the help guys in advance its really apreciated. As usual you guys are the greatest an If you need to ask any questions along the way please feel free to do so. Thanks again.

 

He needs to know something as soon as possible. He uses his truck to haul supplies so its laid up now. So any quick response would be greatly appreciated. Hopefully somebody will know something or refer to the proper forum for a response.

 

I didn't notice the year or F?. My vote would be a Dana 60 or(80) so, trans plant. All money aside. But since money tends to rule it sounds like a fresh set up and a consistent lube change is in order. I know a nice tight possi probably wouldn't help the pinion shredding but, figuring one into the rebuild would be sweet. Best wishes

 

2001 F 350. Not sure on the rear though.

 

Anybody else. Looks like i stumped Ford truck enthisiasts tonight. Who would know a ton about rear axles an such. Im open to anything. Getting desperate here.

 

Something is not sounding right here. Many of the guys on here have run 35" and bigger tires on these trucks without tearing up the rear gears (myself included).

Is it a dually or a single rear wheel truck?

Find out exactly how much lift, how big of tires, what engine, and how much he hauls and how often and we can recommend what gear ratio he should go with.

Trust me there are many guys here who won't be stumped on what to do, you've just got to provide enough information first.

 

SRW 6 inch lift 7.3 diesel 4.10 rears auto transmission. He needs a new ring gear an bearing. He pulls a pretty heavy gooseneck full off used iron around so hes pulling a heavy load most off the time. He had a leak on his pinion seal so he might have lost his oil. He didnt fill me in on that

 

If the leak was never fixed and oil never replaced that would lead to the failure. These axels can easily handel 35's and heavy towing so I don't think that was the primary cause of failure.

Your best bet would be to replace everything along with a new ring and pinion. Most of the time you can get a major rebuild kit that will include all the bearing, seals, shims, etc. If the wheel seals where leaking then you want to replace these too.

You probably want to stick to 4.10 unless you want to change out the front diff as well (if it's 4X4). The 35's with a diesel engine and 4.10 gears should be a good combo.

 

Yeah, don't get so impatient when there isn't enough info to begin with.

Personally reading this for the first time, I wasn't really sure what you wanted to know?

But I would second the suggestions here. Obviously you need a repair. Were you looking for recommendations on gear ratio? Are you trying to do it yourself? Do you need a shop? Curious as to the cause?

It takes a bit of skill and understanding to swap gears but it can be done. You will really need a press to get the bearings on and off the carrier and pinion, race drivers for the pinion bearing races in the housing, inch pound dial or deflecting torque wrench to set the preload, a dial indicator with a base to set the back lash and a big impact to crush the sleeve on the pinion. Among some other things.

I pretty much use Randy's Ring and Pinion for parts. Ask for "Blue". They have warehouses on both coasts, and get me parts fast and at a reasonable price. I have pretty good results with the yukon gears, but haven't installed a whole lot of new gear sets, mostly done diff swaps. Some others may chime in as to what gear sets work well. Some will say OE all the way. Definitely get a master install kit. It will have all new Timken bearings (from Randy's), pinion seal, crush sleeve, ring gear bolts, gear marking compound, shim kit, yoke nut and loctite.

 

Any idea on cost if he needs a new ring gear an bearings if its done at a shop or does it himself. Hes not rich so he would like to save as much money as possible. Thanks for the great info its much appreciated. I just hope he doesnt have this happen again

 

It's all part of maintenance and checking fluids.

Expect $500 to $700 to have it done, parts are probably in the $300 range.

However, this isn't something to chance if you don't understand how to setup the gear properly. Reading the pattern is key. There are several good sources you'll find if you Google, differential gear pattern

 

What are rear ends are available on the superduty. 250,350 srw vs drw. Thanks for the help.

 

The stock rear end (Sterling 10.25) is plenty strong for what he has. Even the best differentials break if something is not installed properly. There are lots of guys out there running 12 second 1/4 mile passes on those rear ends and they hold up time and time again.

 

But to answer the question, the SRW 25/350 has the sterling 10.5 (same as older 10.25 besides actual ring gear diameter and bearing sizes in some cases). The duallies used a dana 70 or 80 IIRC.

 

Just a note though. Your friend or your self may be able to find a used axle complete for less money(?). There is the option of the proverbial donor vehicle. You may find it easier to open a used one up to inspection or have it inspected by a pro, than amassing the tools and required knowledge to re build his current unit. Setting up the gear set for even real good techs, takes some doing. IMO. Best wishes