Shot peening gearbox

It's a mine field is this! Any idea what brand bearngs they were?

personally i dont know what or were they came from as they are not ones that are a known make but they did the job.
perhaps we should turn our attention to the bearings and not so much the gears but even so every little helps.

PartyPete wrote:Is the point of shot peening not to strengthen the metal, and strenghten any existing fatuiged areas?

Yep but i was refuring to the teeth. Need to make sure the gears you get done are in very good condition to start

johnny gtir wrote:

PartyPete wrote:Is the point of shot peening not to strengthen the metal, and strenghten any existing fatuiged areas?

Yep but i was refuring to the teeth. Need to make sure the gears you get done are in very good condition to start

So was I, but I see what you mean, but I guess me paying a gearbox pro to check it all out and make sure it's ok is all I can do really?

Mine field as you say. I guess if you have a decent condition box and good teeth you wont be shelling out too much but replacing lots of components I guess is expensive? I think I will just forget about it and cross your fingers.

I suppose its just me over thinking things but someone with experiance with gear boxes will know better but how many of them deal with R gearboxes but they will know if a gear is worn.

johnny gtir wrote:I suppose its just me over thinking things but someone with experiance with gear boxes will know better but how many of them deal with R gearboxes but they will know if a gear is worn.

Over thinking things is good, as you said how many times will companies come across GTiR gearboxes and its always best to get an idea of all eventualities to ensure you know what to expect from the company's first

Main thing to do if investing money on a gearset is be sure the box parts worthy & do a top job rebuilding it & keep end floats to a minimum & don't cut corners on bearings due to cost or sourcing issues.
Bit like engine builds though, do one tolerance wrong, overlook assembly issue & it a bag of scrap on first heavy run ....

the gtir box is basically the same as any other gearbox and is childs play for any gearbox builder. Its not hard to see if you have worn dogs on the gearing or dodgy hub syncros, bearings but other things will take lets say a more trained eye to spot

the new gtr box is a fookin nightmare and extremely complicated both mechanically and electronically, even many noted gearbox companies will have nothing to do with that

obviously if there are worn gears, bearings, baulk rings, synchros and the like then these parts would need changing as pointless having a box peened with faulty or worn parts.

As for how long they will last once correctly rebuilt and peened is dependant on the use and abuse they endure as one mis-shift can easily take the edge off a gear then its just a matter of time before that gear will eventually strip and in the process cause other damage too, also the selectors (other than 1-2nd) will always be a weak point as just cast alloy so billet steel selectors would be a massive improvement
then theres things like centre diffs that now could not be working as they should due to age and abuse, all needs to be checked over properly and if alls good then shotpeening can only be of benefit and certainly will do no harm.

Technically not hard but you will be surprised how many of the gearbox builders are sloppy at what they check on rebuilds so worth being fussy on who you use .
I had a spare box off a certain Mr Simon for a Evo 5 that had been rebuilt by whoever he uses, had strip that myself as had selection issues as assembled wrong & that gearbox quite simple & same technical layout as the R.
A lot of issue with PAR being slated was fact people doing the UK build done it badly.
Upgrading selectors would be good, the par billet 3/4 selector can be used or look at cost of getting some machined & test the viscous diff while it out .

Mr B wrote:Main thing to do if investing money on a gearset is be sure the box parts worthy & do a top job rebuilding it & keep end floats to a minimum & don't cut corners on bearings due to cost or sourcing issues.
Bit like engine builds though, do one tolerance wrong, overlook assembly issue & it a bag of scrap on first heavy run ....

This is a perfect statement B. The first time I got my box redone I took it to a shop and they seemed to really have no idea, just wanted to slap the gearset in and send me on my way. They didn't want to change bearings because they were hard to source so I went somewhere. The second shop was amazing, spent heaps of time checking everything, sourcing new parts and making sure the job was done right. Unfortunately good quality service and work costs more money these days.

^ I think your experience is quite typical as gearbox work can be done the sloppy way of just replacing a gear, syncro that the main issue & putting it back together with no real checking or setting & to be honest that the norm for run of the mill gearbox service shops.
Most run of the mill shops just want job processed & billed without too much hassle so sourcing hard to get bearings or looking at route of modding bearings is just too much hassle or beyond their capability & as long as they build the box to work & hopefully pass the warranty period is good enough from their perspective.
When you get a real specialist then amount of inspection & setting before final build seems extreme in comparison but that what you need for a good built box.

Can any body recommend a place to get the bearings from? I presume Nissan them selves but I'm sure there will be other places?

I'm not sure about nissan but I know when I got my gearbox done they measured every single bearing and ordered them through their supplier, not sure why they did it that way.

Any decent bearing supplier decent gearbox shop & nissan can do bearings.
Normally a case of using bit of both to keep price reasonable & full standard availability possible.

not sure if he will help you as depends on how busy he is but drop gtir james a pm on here
he may rebuild it for you and check things over prior to getting items peened

he works for Nissan and built his own box recently after a shoddy prior build, I know how thorough he is as sourced hub syncros from us plus obtaining bearings ect should not be a problem so worth a shot

if you cant find anyone locally you can trust then I can give you the number of the company that does our boxes now, there work is thorough too and they have a good reputation in the south east

Right, knackered my standard box, stripped 3rd! Been and bought another gearbox off a well known member on this forum, and it's being sent off this weekend to be stripped, checked and the internals sent off for treatment! Fingers crossed!!

^ get the case cryo'd
Worth you holding onto your old box for few possible spares ...
Interested on prices on the treatment work & company used . Good luck .

I may ask them how much it will cost extra, going to be making the fiber glass end casing aswell, I'll put up how much it cost and the end results! Just hope it's all worth it