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Hi Fred, You have a PM. Send me also an email adress, this will allow me to send you the pics of the gearbox. Cheers Stephane

Hello, I have few comments and answers to your post. The UN1-13 is not the stronger of all the UN1, it only offers the closest gear ratios in respect to the original ZFgearbox. It also offers a mechanical sensor for tachymeter wich is the easiest way to connect the gauge to it. Through the...

ok Dave, There was a misunderstanding from my side. I thought you were talking about the UN1 input shaft (It is clear that I have been reading your message too quick) Did you tried reinforced roll pins such as those in spiral? They offer a greater resistance than the normal ones. Cheers...

Hi Dave, Your approach is interesting. Just a question do you use the original input shaft (I mean the shaft that goes from engine to hub) or a modified one? I should have a solution soon to have the hub not to float anymore but I have to wait for my local CNC shop to finish my prototype...

You are right about the final torque. Considering all these discussions we had about torque, weakness ...of the UN1, I made a search over the forum and see that there is no thread about the UN1 technicals. I think it would be of great interest to have a technical approach of the UN1, having...

ok, here we are... Place the differential bearing track in their respective places, then oil them(a press is necessary). At this step, if you haven't placed the spring and the locking ball for the rear gear, it is the last time you can do it. Place the lip seals in their places. You need a...

Gentlemen, I am offering for sale a fully rebuilt Renault gearbox UN1-13 (the one that mounts on the R21 Turbo 2L). This gearbox was originally destinated to one of my friend who needed a replacement gearbox for his autocross. He finally changed his mind as he switched his engine for a audi...

A long time, I haven't posted pics, so I sorted some pics to send a little serial to continue the thread. Unfortunately, I have to go to prepare dinner for my kid, so comments will be posted later or tomorrow morning.:shrug: Neverthless, I think many pics can be understood by themselves...

Eddie, as far as I understand, this part does not exist for the R21 differential....

Eddie, Drawing of the R21 Turbo UN1 differential. I hope this may help Stephane

Eddie, Sorry for the poor quality of the pic but upload limitations drove me to have the pic to be reduced. If you want a full BMP pic, send me your email in PM. Cheers Stephane

Hi Eddie, Here is the differential drawing for a un1-05, Should you give me the numbers of the parts requested, I would give you the references....:happy: Cheers Stephane

Carlos, You just have to spend few bucks (50-70 euros) to buy an old "washplate machine". I don't know if the word exists in english..sorry...(this is the machine you have in your kitchen to wash plates). It will give you this result, even more..for inside and outside. For the finish, but...

Hello gentlemen, Thanks for your comments. Unfortunately, I am a little busy and I don't have have time to post pics and write the explanations. Neverthless, I promise to finish the "tutorial". I will try to post pics for the differential precostraint measurements and setting the...

Hi Tobias, Yes, the red crowd is for the speedometer. On Un1-13, there is no electronic sensor but a mechanical one. Cheers Stephane

I forgot this pic...Nothing of big interest but at least the collection is complete. Cheers

Then differential. Unfortunately for the pics, this one was really in good shape, so I didn't have to open it. Check for excessing moves, if so you'd have to open it and change the 3 friction washers inside. 2 are on the pic (the copper ones) and there is an other one (if i find one in a...

Primary shaft Place a needle bearing then place the 3rd gear wheel on it. Put a syncro, place the hub, then the 3 rollers with their spring and slide down the slide hub. Put a locking ring, then place above a needle bearing. Put a syncro on the 4th gear wheel and put it in place. Put a...

Sorry guys, I didn't had too much time to post over there, so I took some pics when rebuilding an other UN1 for friends. Here are pics for the rebuild of primary and secondary shaft. Place a new spring on the 2nd gear wheel, then place the needle bearing on the shaft. Place the 2nd gear on...

Gentlemen, I have been lucky enough to find a UN1-04 for very very few bucks.....30 euros :2thumbsup:.... By the way, I found a place with 4 or 5 UN1-04 sold for 225 euros per unit. If someone could be interested, I may help. To turn back to our torque discussion : I measured the...