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Correct Danny, I was talking about the brass locking ring. Even if Renault does not indicate any settings, my experience is to discard any locking ring under 1.40-1.50 mm when measuring from bottom on the conic gear. The sliding hub has no specific measurements on it. Just the normal...

Hello Danny, I was obviously kidding you with the 9x35 ratio. Comparing to 9x31, obviously 9x35 would be the best choice for street and hill climbs racing. 9x31 would be perfect for Lemans/Spa racing. Yes the plate is a design of our own and is part of the set of improvments we engineered...

Danny, The UN1-08 gearbox went modified in 1988 (if I remember well) to handle a syncromesh reverse gear. This is a good option that you would better keep. Also the primeshaft is a little bit more resistant to flexion because of the longer splines (reverse) on the primeshaft So I would...

Bruce gave a very good information. Just to add this info : The 369 gearbox can be find in various versions in the following cars : R20 TX/Ls/TS, R30 TX/TS and also R5 turbo 1 and turbo 2 and old Alpine A310....as far as I know I dont know on other countries but here in France no...

John, Renault Master van used UN5 gearbox and not the UN1 gearbox. UN5 are unfortunately not suitable for our cars as the final drive is too high : 7x41 and also the internals ratio are different. UN1 were only used in cars such as Venturi, Alpine, Lotus for the ehanced versions and...

That is for sure a special marketing strategy : Buy it first and you'll know what it is...:stunned: I fully understand that Tornado USA doesn't want to disclose the details of the proprietary modifications engineered in the UN1 but I don't understand why further and global informations can't...

Scott, I am still waiting for the answers to my questions about the modifications you announced......:shifty: Cheers

Scott, What does : "modified 2nd & 3rd gears" means? a different ratio, straigt cut pinions.....etc...? "Drilled out oil ways means" : oil ways in pinions such as 1st and 2nd gear, housing holes...? Wich UN1 are they? Are they 9x31 or 9x35? Diff with 2 or 4 planet wheels? Regards...

Ian, just to be complete as there might be an easy answer. UN1-09 is not a renault gearbox but UN1-S-09 is the common code for replacement gearbox UN1-04 & UN1-08. Just in case you can see an "S" in your serial. Cheers Stephane

Ian, You are right UN1-09 officially doesn't exist in Renault litterature. I guess you might be right with the rallye purpose. This is clearly a hand built gearbox as the serial sticker is not in conformity with the renault quality standards : Serial must be 6 digits and filled with 0, so your...

Thanks Simon. Stephane

Gentlemen, Some time ago, I announced I was engineering ways to improve the UN1. The first target was to work on the differential fitted in the R25-UN1 and R21 Turbo-UN1. These gearboxes that are commonly in use in our replicas suffer from a weak differential...(not the only weak point...but...

Howard, If you want new parts, I can buy new parts here in France and send them to you. As an ex Renault staff member, I also have a discount of 6%...not a lot but still something...;-) Cheers Stephane

Howard, Let me know if you don't find a convenient way...I would help. Cheers Stephane

Hi Howard, The Renault ref for the mechanical speedometer (R21 L485) sensor is 77 01 464 631 but it seems to be not more offered for sale. There is surely another way to find it. The espace 2 (renault code J638) has the same speedometer system. As the housing for the differential has the...

and finally : We are finally arrived to the last steps : Put blue loctite on the 3 bolts that hold the rear locking plate and tight them (50 nm) Put oil on the primary shaft, then place the big washer, then the ring. ensure the oil holes are aligned (shaft and ring). Continue with oiling...

Hello, I don't have the same numbers for the original ZF, neverthless I arrive to the same conclusion for the Quaife choice. Neverthless, I think it fits better with a UN1-13 than with an Alpine one for ratios. Here si my sheet. Green = in the average; Red = over the average. Cheers...

Now sold. Thanks Stephane

Hello Ian, Your gearbox, if the plate is correct comes from a Renault 25 V6 (plausibles types B29E,B29F, B29G). You should have a look at the casting year; it is, for example, stamped at the rear part of the gearbox (the housing with the arm lever). It is stamped with 2 digits...

Hi, I have been asked to post pics of the gearbox. Here they are. I also have pics of the internals that I took before to close it (if needed). As you can see, the gearbox comes with a UN1 - Ford bellhousing (lok at the prices for these specials bellhousings...) The input shaft is larger...