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GT40 Tech - Powertrain/Transaxles Transaxles and driveline - don't dare post engine things here!

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Old 29th September 2010, 02:13 PM   #1
United States
Join Date: Sep 2009
Location: Myrtle Beach
Posts: 4
identify gearbox

I thought I had a un1 box but the tag on the rear has across the bottom 001339 and then around the sides up over the top starts with c NG9003. These numbers are on a metal stamp tag bolted to the end. Then I found a number on the housing at the tail that had 7700598829. Can any one help me identifiy this because I need to make an adapter to mate to a bmw v12. And can anyone give me the information in what I need to do this with.
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Old 29th September 2010, 04:05 PM   #2
United Kingdom
Join Date: Jan 2009
Location: Jersey UK
GT40: Southern GT 40
Posts: 9
Re: identify gearbox

look at this link on ebay it has a bit of information

RENAULT 21 GEARBOX (CODE NG9001) 2.1 TD 92 on eBay (end time 18-Oct-10 13:33:08 BST) is offline   Reply With Quote
Old 29th September 2010, 06:17 PM   #3
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Join Date: Jan 2002
Location: Essex, UK
Posts: 2,887
Re: identify gearbox

Will a UN1 stand up to the torque of a BMW V12 engine?
I would have thought a ZF or G50 would have been a safer bet.

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Old 30th September 2010, 12:47 AM   #4
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Join Date: Jun 2007
Location: France
Posts: 145
Re: identify gearbox

A standard UN1 has high risk to break above 40 mkg of torque. This considering the Yield trength curve of the steel used and the different shaft sections. Obviously this value may vary according to the resistance the car offers to the force moment (weight, tyres friction, air resistance with speed etc...) and also by the heat inside the gearbox. Anyway keep this number (40) as a pivot for a standard use of the gearbox. Below 35 it is ok, 35-42 is the high limit, above you need upgrades.

A NG gearbox is the poor sister of the UN1, weak gearbox even if at first glance it loks like a UN1, it is really weak and clearly not safe for the use you plan to do.

So better to sell it and buy a real UN1/UN5 if you want to go with Reault or any other brand according to the recommendations made here


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