Outer Limits 4x4 Board

Hi all, Just wondering about peoples experances with these gears as i have just had some 4.6's fitted to the rear of my GQ Patrol (front has already been done with airlocker ). They were set up by a well known diff man in melbourne who is very good at this sort of stuff. The gears were brand new with new bearings and seals also done and am using 85/140wt penrite limslip oil (which was recomended). now i have only done about 500k's with them and have found them to be quite noisy from abot 80km/h when you back off. is this just a bedding in thing or is this how they are going to be?
Cheers, Kane.

Hey Kane,
As a TT stockist i have sold many of there diff gears and never had an issue. You should take it back to the person who fitted them immediately and seek there advice on the noise. If you have a noise on decel then there's a chance there may have been a mistake made when seeting up the gears.
Dan

agree, if they're noisy (and have not been abused/filled with mud etc) then there is a problem with the gears. the install is well within warranty (statutory warranty on vehicle repairs is at least 3 months/5000km) so take it back and drive it with the guy who built it in the car with you.

I have never fitted TT branded gears however I have found as a general rule of thumb, the lower (numerically higher) the ratio, the more difficult it is to get a really good pattern on drive AND coast, and smaller adjustments result in bigger changes, making it very easy to overshoot several times when selecting pinion shims. sometimes an experienced diff installer gets a bit lazy with setting up bearing preloads and gear backlash, and those settings, in my experience, become more critical the lower the ratio gets.

the other likely possibility, with noise on coast, is that the pinion bearing has failed; new parts aren't always perfect (although with bearings the defect rate is very very low), or perhaps the nut wasn't staked properly and has walked off half a turn, leaving the preload all sloppy.

take it back, anyway, it should be a warranty. diff gears should be quiet from the moment they are installed; they are lapped together as a set so there is effectively no 'bedding in'.

DD

I have used TT gears, bearings, bushes, synchros etc in a gearbox / transfer and it's as noisy as it was before being rebuilt. I even had it pulled apart again after 2500km and nothing showed as being rooted..

Troopy93 wrote:I have used TT gears, bearings, bushes, synchros etc in a gearbox / transfer and it's as noisy as it was before being rebuilt. I even had it pulled apart again after 2500km and nothing showed as being rooted..

transmission gears are a different story to final drive gears. they can be a bit pot-luck especially with transfer crawler gears. your experience, although disappointing, does not really apply in this case.

Thanks for the replys. I purchased the gears from a internet 4wd shop and When i droped the gears off to him, he did mention that he was familular with them and never impressed with the TT gears (build quality) and that i should have gotten genuine ones (which are more than double in price). The sound they make isn't constant but it does come and go and have only been used for easy driving since instalation.

sounds like he got the pattern good on the drive side but crap on the coast side.

I have a set of TT's in the rear of my Wagon, no noise, done 5000k's on them, there fine