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pulling a dumb a-- move

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rak12

rak12

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North Texas DFW
RC Driving Style
  1. Bashing
so i spent the past 5 nights rebuilding, upgrading and cleaning my 4908. I replaces the rear bulkheads, upgraded springs to the traxxas progressive rates (the white ones) , replaced dingy fuel line with nice clean shiny line, replaced steering components with aluminum for less slop, etc.etc. The whole time I'm anxious to go and get some run time in. I'm giddy with excitement. finally I get time to go "play", I fill the tank, crank it over and it fires nicely. I attempt to drive and it goes nowhere! Well after I fgew minutes of thought I realize I put the rear diff in upside down! So the front wheels are driving forward and the rear wheels are driving backwards. Damm me! My advice to others: take your time and double,triple check all settings, layouts etc less dissapoint may ensue!:(
 
It will go in either way.
I guess you know that when you have a 50/50 chance at something, there's a 97% chance you'll do it wrong. :whhooo:
 
One thing that I did was put a mark on my diffs to indicate which side was the top. I used a silver sharpie marker and made an "x" on them so I put them back in the correct way. A paint maker would to the trick as well.
 
I'm done kicking myself now. I like the idea of marking them right side up. Most of my build time is after the kids get in bed around 9:00 and after a day of work it is easy to slip up and make errors. It did get me thinking about setting both diffs upside down and have a rear steering tmaxx. The body may even fit with a little modification. :hehe:
 
Definitely been here. I recently swapped front and rear ends from a E Maxx to a T Maxx. Too bad I didn't take notice of the fact that the trannys operate in opposite directions. 2 Maxx's, 4 diffs in backwards.:)
 
doesn't the diff only lock into the bulk heads one way? because when i busted my bulk heads on my 4908 the bulk heads would only go together 1 way and the diff only fits in one way i belive, but correct me if I'm wrong.
 
hey Metalhead, just out of curiosity why did you switch the F/R ends from the Emaxx to the Tmaxx? aren't they the same between the two trucks?
 
I had the old, short a-arms on the T Maxx, and wanted them on the E Maxx. The E Maxx also had 4908 shafts and carriers, and I wanted them on the T Maxx cuz I picked up an OS .18 around that time and knew the stock shafts would be toast. So I just swapped the entire front and rear assemblies from one truck to the other, thinking "piece of cake". In the end, they both got complete tear downs. If you gotta take the diffs out, might as well open them up.:)
 
Man I have done that before too. I did it on my Jammin CRT truggy and I was p/o'd pretty bad becuase i was at the track when I figured it out. I fired it up and went to make a warm up lap and wouldn't you know it...the front diff was swapped around...ARGH! Everyone got to have a good laugh. Then about 5 people jumped in to help me swap it around real fast. I happens...all good. I hope like heck I don't do that on my T-Maxx because I have the FLM hybrid diffs and they are a lot more work to swap stuff around. Love those diffs...I ended up putting in the Ofna 6 gear Spider diffs. Everything else in the truck may break..but the diffs will survive.
 
oh okay thanks for correcting me i wasn't a 100% sure. hopefully i never do the same but i may learn the hard way.
 
first time replacing rear bulkheads and i did the same thing. took me a while to figure out exactly what happened.

still kicking myself in the ass.
 
HA, I have done exactly that before, only, after i did it, i fixed it so i could run it, same day i blew my tranny being the 2-speed with reverse, so i pulled out the back up that is one speed no reverse, witch then required, me to flip both the diffs, :( total bummer, three times had to tear it down to that point just to get some hours in, but i took it as a sign, and did a complete system rebuild, has went fine since, only i will have to do it all again when i fix my original tranny, i know how you feel :)
 

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