UN1 gear box repairs

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UN1 gear box repairs

Postby chris » Thu Jan 19, 2012 11:42 pm

Hi ,I am repairing my GTA gerbox , I am installing a Quaife diff and changing the diff ratio due to big wheels . The diff i am using is out of a R25 UN1-03 but my problem occured when I found that the secondry shaft was worn at the pinion end underneath the large bearing. As the bearing runs directly on the shaft ( no inner part to bearing) the shaft is irrepairable.But if I use the bearing out of a UN5 (Renault Master 89-98)
It has an inner ring ,so I can grind the shaft and fit the new bearing.
Problem is that it is not a standard bearing and I might have to get it from Renault, so what I actualy need is the Renault Part number or a Vin number for a 89-98 Renault Master .
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Postby simontaylor » Fri Jan 20, 2012 4:17 pm

What ratio is the diff changing from and to?

I was wondering about a change too.
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Postby stephendell » Fri Jan 20, 2012 7:58 pm

Diff changing 3.44 to 3.89
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Postby RED21 » Fri Jan 20, 2012 8:08 pm

Have you got a copy of the UN1 repair manual? if not there is a copy in the technical help section.
Go to the last couple of pages which shows a gear/ shaft breakdown with postion numbers. Let me know the number of the bearing & I will see whats what.
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Postby chris » Sat Jan 21, 2012 1:17 am

The UN1 manual states the 3rd and 4th gear are not removable off the secondary shaft but I have spoken to several people who have. the UN1 bearing is an SNR NU 10705 but I need to replace it with the bearing from the UN5 gearbox providing that no other diameters along the UN1 box are greater than dia 38mm ?
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Postby TONY LAW » Sat Jan 21, 2012 11:05 am

Hi,try Mark@Bearingkits.co.uk 01279793631,they may be able to help.
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Postby RED21 » Sat Jan 21, 2012 10:11 pm

In the pictures are the only bearings available separately from a UN5,
If you can post the actual dimensions we could check our UK suppliers?

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Postby RED21 » Sat Jan 21, 2012 10:14 pm

RED21 wrote:In the pictures are the only bearings available separately from a UN5,
If you can post the actual dimensions we could check our UK suppliers?

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http://i200.photobucket.com/albums/aa171/red21t/UN5gear1.jpg

http://i200.photobucket.com/albums/aa171/red21t/UN5gear2.jpg

http://i200.photobucket.com/albums/aa171/red21t/UN5geardiff.jpg
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Postby chris » Sat Jan 21, 2012 10:59 pm

The bearing is dia 80mm od 24mm wide with no inner ring , an external retaining ring and the rollers run on the secondary shaft which is about 42.65mm dia. The UN5 i think is the same but it has an inner ring with an id of 38mm.
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Postby RED21 » Sun Jan 22, 2012 12:04 am

At present can't help to much, but you can try this SNR web page
https://www.ntn-snr.com/catalogue/fr/en ... ue/home/ra
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Postby chris » Sun Jan 22, 2012 11:46 am

Been there


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