It might not have been weak screw but loose ones. Say they loosened just a hair and caused some slop in the ring gear, then when torque was applied the ring gear would put pressure on the screws. Then no torque no pressure. On and off like a hammer pounding a nail. Until they snapped. Smell what I am stepping in? I would put a bit of loctite on them.

yea its possible. i know the screws i used from the hobby shop didnt seem to tighten real good. the ones im using now are longer and tightened really good. i might use some blue loctite just for extra security.

Definitely if they were not the right length they would not have enough bite in to the case. I have seen it happen on 1:1 stuff. Its no different in these. Loctite will not hurt.

yea true. i mean they screwed in pretty good. i think the guy got the pack of screws from the airplane section. they were either too weak, or they came loose. the ones im using now screwed in pretty tight, and i believe they are longer, plus i used blue loctite. so im hoping im all good to go after i get my aluminum diff housings.

well i found one blue aluminum diff housing on ebay so i bought it and it arrived today. now i can put either the front or the rear back together. now i need one more. i been looking online and e-mailing company's and it seems everyone is out of stock! if anyone knows where i can get a integy blue aluminum gearbox for the 4908 t maxx part # intt4092bl please let me know!!! thanks.

ok i put the new gearbox in the rear. then i put the engine back on, the arms, skids, bulkheads. so the rear is all buttoned up. now i need to get one more integy blue aluminum gearbox for the front. some online company's is saying late april until they get some in i really dont want to wait 5-6 weeks to get my t maxx finished up after i do get the gearbox for the front i can put everything in front back together and throw the cage back on. then outside to test it out. i hope everything goes good!

last night i browsed around online again for that gearbox and on rc planet it said in stock. so i e mailed them last night and they responded today saying yes we have it in stock. so i ordered it and now i will have my second gearbox. it will probably get here early next week. i will update after i get it!

The simplest answer is probably the right answer.

When the guy at your LHS swapped out for the "shiny" screws, he put in screws that were made of a softer alloy. They probably can't handle the stress the diffs are subjected to.

You're probably better off ordering some good quality, hardened steel screws that fit your application. (12.9 grade or something like that)

Check out Tony's Screws or Hexcrews for them.

yea i agree. i didnt even think at the time like will these be strong enough? he should of known or maybe he thought they were? i already put newer screws in. they are a bit longer and i used blue lock tite on them. hopefully everything will be fine. but.....if this happens again i will look into some stronger screws. thanks!

well i checked the tracking # and my gearbox is close! hopefully it will be here today if not tomorrow. i will update after it comes and i get it in the truck. then i can take it out for a test run

ok the second gearbox came in today! i put the diff carrier in greased it up and its back in the truck. i put the front end back together and put the roll cage back on. its ready to go! im going to take it out for a test run wedsnday. i will let ya'll know how it went. wish me luck

ok i ran a full tank of fuel through the t maxx today and all went well. i ran up & down the street for a while and through the yard. just some tuning and adjustments here and there. i only have about 1-1/2 tanks of fuel left so i need to get some more. i need to hit my track in the park next to my house and see how it does over some jumps. i will post updates as i go.