HELP WITH 3:73!!!

94MuStAnGGT5o · Oct 24, 2010

Finally going to replace my old sound-making differential gears, they guy i bought the car from said there are 3:73s in the back but i just removed them and they are 4:10 gears.....

oh well i have worked on it the whole day today and replaced everything and this is where im at right now, im wondering if they are set up good enough, i have been told if the pressure mark is in about the middle and not touches the edges it is perfect, just to let you guys know this is my first time doing a gear-swap. I have never done it before all i have a step by step guide from AM

Cheers
and sorry for the WAY to big PICTURES

94MuStAnGGT5o · Oct 24, 2010

i need to know now as im putting it back together in 30 min

CC'S95GT · Oct 24, 2010

I would like them set a little deeper in the ring gear personaly

94MuStAnGGT5o · Oct 25, 2010

well i got problems now, they make a sound.............................. faaaaaaaaaaaaaaakkkkk i have to take them out again and reinstall......

CC'S95GT · Oct 25, 2010

are you using a dial caliper and actually measuring the back lash, or just going by eye?

94MuStAnGGT5o · Oct 26, 2010

going by eye, i don't have such expensive tools. I redid it today, still whining but less. I will have to do it again and get the proper tools

shaunk · Oct 29, 2010

What gears are those? Were you loading the gear when you checked the pattern? What size pinion shim did you use? You have to set pinion depth and backlash.

DFG_magic · Oct 29, 2010

Hope you get it figured out bro. I did my 3.73's yesterday. Night and day difference over 2.73's. Car feels like a freakin' beast. You'll be happy when it's all said and done!

94MuStAnGGT5o · Oct 31, 2010

redid it again today, with the proper tools..... still whining. Will they set after a while or will it stay exactly like it is now because it whines like before. If it doesn't i could of saved the 350$ and just left my 4:10s in it..

95PGTTech · Oct 31, 2010

what is the backlash?

94MuStAnGGT5o · Oct 31, 2010

backlash was 0.009 which is in the 0.008 to 0.015 area and the manual said anything between there is good

toyman · Oct 31, 2010

Are these used gears? I'm told that it's difficult to get used ones to be whine free but then again I've had experience with a new set that whined. They at least could be exchanged.

94MuStAnGGT5o · Oct 31, 2010

They are brand new, and brand new bearings too. I set them up incorrect and drove for 20kms to test it out but whine was still there so i rebuild it to the now state. I don't know whats going on and it is really starting to piss me off.

94MuStAnGGT5o · Oct 31, 2010

could it be the transmission?????

mine kinda sounds like that

http://www.youtube.com/watch?v=m9u9wsSl3Sc

and like that, so you guys know what im talking about

http://www.youtube.com/watch?v=olj6t6-KTbg&feature=related

Slykin · Oct 31, 2010

Considering you said it got a bit quieter after changing it up, then i'd assume it wouldn't be your transmission.

ryclef331 · Oct 31, 2010

What brand are the gears? How did you set the pinion depth? The backlash, while good on the measurement, if ran tighter can make more noise.

94MuStAnGGT5o · Oct 31, 2010

ryclef331 said:
What brand are the gears? How did you set the pinion depth? The backlash, while good on the measurement, if ran tighter can make more noise.

Gear Brand is Motive Gear, Pinion depth was .3