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Forgot last words... It drastically raises the cost for nothing...just bringing a financial contribute to King Sarkozy wich makes me puke twice...

Also, One of the cost raiser is machining. I have my parts machined in the US for various other gearboxes project as in the US you can find some great people loving to mill and to produce nice parts where, here in France, forget.... But the problem with the us machining is that it is...

Hello Phil, No, this LSD is only existing on CAD at the moment... The 4 spiders diff already run with offroad cars with no probs, but you should already know this if you run UN5 as it is OEM build with a 4 spiders diff. Anyway the main problem with the UN5 is the rear bearing of the...

Gentlemen, We recently engineered, for our cars, a ZF type LSD for the UN1/UN5 gearboxes. It is an LSD with 2 friction discs by axle, so 4 for a whole differential with 8 friction surfaces. It is build with the 4 spiders configuration and use the OEM diff housing. It was our main...

Hello, I don't know if I understand you right, but assuming you are you talking about a Renault super5 GT Turbo, it, unfortunately, comes with a "JB" or "JC" type gearbox and not a UN1. Cheers Stephane

Hard to say or to find any informations on this. GP cars details are unfortunately very hard to find, so I can't confirm or infirm. Anyway, if it is, it should be with 70's gp cars. But what I can confirm is that, most of the time, Renault used the UN gearboxes in their rallye cars with...

As far as my little knoledge on UN gearboxes allow me to go, nor Peugeot or Citroen mounted Renault UN gearboxes in their cars. Cheers Stephane

Hello, Quick shifting with the UN1... You have simple options and more complex ones : Talking about 3,4 and 5 in the UN1. A thoroughly polishing of the conics give good results with a blue printing of the rings on them and obviously new rings. Basically using the same polishing paste...

Re: help with un1 gear changes. hard to do at speed but easy at slow speed changes. To know wich UN1 it is : How many teeth on crown diff? Mechanical speedo or sensor on the gearbox? How many teeth to the 4th gear pinion? How many teeth to the 5th gear pinion? Cheers

Do you have access to the refs stamped on them? If so let me know the numbers. Cheers

Re: help with un1 gear changes. hard to do at speed but easy at slow speed changes. Hello, The box is dismantled. It happens on every gear? Check the dog teeth and hubs. Cheers Stzephane

sorry forgot the bellhousing and adaptor plate, but prices are available from various manufacturers. Stephane

Hello Simon, Hard to say what is the value as there are many factors : Consider a basic UN1-13 to be an average of 300 euros of value (from junkyards or others). Consider the value (renault prices) of parts to be replaced (serious rebuild) of an average of 300 to 600 euros (would depend...

From outside, hard to say what gearbox you have, have a look at the casting year on the housings and also if it is a mechanical speedo sensor or an electronic one. It may help to determine what could it be...but if it has been dismantled, you cannot be sure that what is inside is in accordance...

Hello Bryan, What kind of UN gearbox it is? Only 3rd gear is affected or even 4th? When you say 'fairly new', it means it has been recently rebuilt? Let me know Cheers Stephane

Hello, You are right. In fact all UN1 after 1986 have the oiling device. It is a revision done to the gearbox. The parts impacted by this revision are the end cover and the primeshaft. The focus was to bring more oil to the steel bush of the 5th gear system. Bush bearing (I dont know...

Hello, This part flows oil in the primeshaft. The primeshaft is drilled at its bottom side to allow this inlet to fit inside. The way it works is simple. Oil flow along the walls of the cover and part of this oil is redirected into the primeshaft through a kind of pocket that handles this...

Hello, Just noticed that Tornado's corner disappeared from this site. What's up? Chhers

Hello Bob, Top of the back cover to spit oil directly on the primeshaft is a good place. But as far as I can see, your back cover is a very old one as it doesn't have the little oil input to drain oil in the primeshaft. This modification appeared in 85-86 if I remember well as was the result...

Hello Philip, I don't do any job on UN5 as we race with 9x35 & 9x31 final ratios. UN5 is a very good gearbox and even in its raw version includes some tricks, I'd like to see in basic UN1 as for example the input shaft with bearings to keep it perfectly straight, wich is more than a good...