General Chat

little tip: the trx400fm and the early trx450S ( '98-'01  trx450S ) , both use the same front differentials.

solution ?..yeah...but it back to all stock ?..lol. i don't mess with all that fancy crap, all it does is give you trouble !, ( as you are finding out ). there is not one thing that is going to make a utility atv go faster, not even all those after market parts you put on it. other than this info ?, i have no idea ?, as said..i do not waste my time with after market gimics.

yes, the sensor where you adjusted the connection, that is where the speed sensor is. as stated, be sure to check the pinion collar splines for being stripped ?.

front final shaft is shot, time to replace. may as well open up the front diff, have a look at the ring gear, and all the bearings. keep in mind, you should replace all 3 oil seals while you are rebuilding it. word of caution !, the final shaft, in order to replace it ?, the engine has to come out, engine split in order to replace the final shaft. replace that oil seal right there in the front cover also.

Hi folks, thanks in advance for reading. I have a 1995 400 Foreman and the front propeller shaft is worn to the point of failure.    I’ve seen used ones available and I plan to replace the shaft & drive collar.    My question is: how bad do the splines on the front differential and transmission output shafts look? They are definitely more worn at the contact surfaces than at the “shoulders”.  In your experience, would you R&R the propeller shaft and ride? Or would you look to replace the front diff (coupling or entire unit)? What about the tranny shaft?   I can provide more & better pictures if needed.   Thanks for looking!