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Thanks for these contributions, it should help. Thinking about it tonight, I think there is one important information missing : the wheels diameter. I considered that increasing teeth would mean increasing diameter, wich is not sure. I don't already have the 0.76 gears pinions ; I am now...

Hi Bruce, Thanks for your comment. My understanding is this one : The original wheel on the primary shaft will increase (from 39 teeth to 41). The original wheel on the secondary shaft will decrease (from 32 teeth to 31). This should lead to a torque decrease but I am far to be a...

The excel file :

Just wanted to calculate what was the impact of fitting a 0.76 ratio 5th gear instead of the original 0.82. In a theorical world, this would allow an 8.5% increase for max speed and a 8.5% torque decrease (5th gear) wich seems to be good as the weakness of the UN1 is the primary shaft 5th gear...

To allow a better understanding of the dismantling sequences, please find attached a drawing view of the shafts.

Now the primary shaft. Remove the sleeve of the motion shaft. Then separate them...some rust here... Remove the seal. Remove the locking clip (using the right tool not this one, see previous post). Place a support under the 4th gear pinion (just under the big teeth not the little ones)...

Hello, Didn't had too much time to post...Sorry. Now, dismantling the secondary shaft. How to do : Using a press remove the 5th gear pinion. Remove the big roller bearing, it would come by hand but the use of an extractor tool can be of help (I had to do). Then remove the big wheel...

Done some work on the rear housing : Cleaned the cast, Changed spring Changed shells Changed O Ring seals Changed lip seal It may sound easy and quick, in fact it is not... How to do : Unscrew the rear gear unlocking cable, pull the rocker. It would come not easily, if you don't succeed...

Carlos, I have a permanent access to renault references. I will try to edit screencaptures or will export them in an excel sheet. For sure, it is better to have the renault references of the parts needed if you want to stay in a friendly relation with your local renault shop : they don't like...

So, Engage the reverse gear axle, place the selctor with a new washer. Place the new spring of 1/2 the axle, place a new locking ball, push down the locking ball and push the axle to put him in place. Do the same for the 3/4 axle : new spring, new locking ball. Put all sleeves in place...

Then, Using a tool to be stolen to your dentist (a good reason to give him a visit), remove the springs of the locking balls. Give a good cleaning to the axles and fork. With a soft file, gently adjust the forks and selectors side to remove any diseases. Remove the magnet to have it...

To go on... Done some cleaning to the housings, a lot of dirt and old grease removed. Some superficial rust because metal was hardly cleaned, nothing of importance. Work on this housing : Cleaned all axles and forks, Replaced locking balls and springs by new ones, Replaced gear selector...

Using an extractor, then I removed the fifth gear. Then , just engage 2 gears (rear and drive) to block the shafts to allow the bolts for primeshaft and secondary shaft to be removed. Then, unscrew the 3 bolts around the pinion on the secondary. It is important, not doing it will not allow...

Oil and water newer mix.... this rusted colour indicates that water entered in the box...normal I gave it a karcher wash few weeks ago. So next move is to remove the bellhousing, not difficult, just few bolts to remove. The crown looks ok , no rust. Then, I removed the tube over the...

A broken teeth indicates that the box has been previously opened- might be a good or bad news - I think bad as a broken teeth means that the guy that has done this work didn't had the right tools.... I marked the nut with the box, unsrewed the locker, and (using the right tool) loosen the nut.

Hi, I finally decided to start my UN1-13 rebuild. I got it from a R21 turbo 2L 1988-1989.The price was good (225 euros) and the gearbox didn't look too bad when I was under the car in the junkyard working to remove it. Let's have a look. (BTW, I am french so excuse my poor english and...

Hello Gentlemen, Many thanks for the informations posted. It will be of great use and it allowed me to learn more things. Thanks Stephane

Gentlemen, I am beginning my build of my tornado GT40. I now have the engine, thanks to Skeleton. What are the best sources for a bellhousing allowing a renault UN1 to a ford 302 to be properly attached. Tornado sells one, GTO Racing too, are they any other sources or if anyone on the...

Fred, You have a PM Stephane

Thanks for the advice Simon, But I think this engine is too much low in HP. According to the text of the ad, it comes from a 1986 mustang...so it should be around 210 HP while I would like a 300-350 hp. Neverthless many thanks for the hand. I really appreciate this friendly ring on this...