Holly Cow!!!

[Must-Be-A-Stang]

Just did the best mod to my car as of yet. Put me in some 4:10 gears and man-o-man I wish I did that a loooong time ago. Its a brand new car. I went from 2:73 to 4:10 and I about shat myself LOL. I was scared it would be too much... but now I want like 5:33s or something .

I have one problem though. While driving over 25 30 mph I hear a noticable whine when I let off the gas. What could this be? When we put in the gear oil we had the car at a pretty good angle, so do you think it might not have gotten full?

Thanks

 

[04sleeper]

Sounds like the backlash on te gears was not set properly.
Who put them in?

 

[Must-Be-A-Stang]

Me and 2 friends. But my friend is a good mech. We did have a probelm getting the crush sleve crushed. could thta be a problem? Im pretty sure it was tightend enough. Can I drive the car with the backlash, what will it hurt?

 

[crazypete]

You will destroy your gears in a few days.

If it makes noise on decel, you need to crush the sleeve more. Do a few turns, take it for a drive, do a few more, repeat until it doesnt make a peep.

I did the most unholy sin and reused the existing crush sleeve when I did my 3.73's myself. I just tightened until I felt a slight amount of drag on the pinion and went for a drive. Actually, I didnt tighten enough the first time around and heard that same noise, went down and tightened until I felt a little drag and the noise was gone. 1 1/2 years and 10000 miles later, when I went 4.56 and we took the 3.73's out, they were perfect. Not a scratch or groove on them.

 

[Must-Be-A-Stang]

We almost re-used the orginal crush sleeve but luckly a friend of mine had a new one from his 3:73 install. What sucked is we put the impact on it and it didnt want to move. The impact was a cheapie. We couldnt fit a cheater pipe under the car either. The thing got really tight so we assumed it was crushed. I just talked to my friend and we're gonna take it to the shop today and throw it on a left and use a better impact. Also, we'll fill the pumpkin the rest of the way since it will be level.

 

[04sleeper]

Sounds like a good idea...

 

[crazypete]

There is a home way to do it I suppose. It is the reverse of what I did to get it out. Put everything together with the pinion nut off. This uses the axles and gear to hold it in place. Put car on ground and set e brake and put trans in park and chock the wheels. Get a huge 2 foot breaker bar and attach to the pinion nut. Get a scissor jack and put it under the arm of the bar and extend. This will exert the proper amount of force but it is not precise and takes a while.

 

[Ford_Racing]

I have been told that once they whine, you'll never get them to stop whinning. Good luck.

 

[PNY PWR]

Yeah, when I did the 3.73's it was like wow, then I did the Paxton and it was like wow oh wow

 

[Michael Yount]

Did you actually measure backlash before and after, or take a look at the gear mesh pattern?

 

[dude5l]

I have been told that once they whine, you'll never get them to stop whinning. Good luck.

If you fix it right away without putting too many miles on it you should be O.K.

 

[BlownStangGT]

Mine whine a little on decell, but they were used. Backlash was within spec and everything checked out.