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Thread: Rivergate conversion in MK1 MGB
Posted 28 May 2004 at 02:02:35 UK time
Moe, SC

Todd, Try this link or do a search for it....Good info....www.mgfivespeed.com


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Posted 27 May 2004 at 13:37:28 UK time
Todd Alkire, Alabama, USA, catalkir@yahoo.com

Thanks to everyone that provided info. Bill Perry at Rivergate emailed me back and told me that the conversion will work in my car. I think this will be my upcoming winter project!

Posted 27 May 2004 at 01:49:57 UK time
Allen Bachelder, New Castle, VA, bachldrs@pemtel.net


I haven't done this is in an MGB, but I have done it in a ZB Magnette, along with a 5-main 18GB series MGB engine. I can't say enough good stuff about Rivergate.

Their kit includes new backplate, new flywheel, and new spigot bushing. It uses an MGB clutch cover with a Nissan driven plate and slave cylinder. Their kit does use the five-main type starter as used on any 1968 or later 4-sync MGB. I preferred to use a newer type gear reduction starter. Unless Rivergate has made some changes in the kit, it will not work with a three-main MGB engine. It does work fine with the 18GB - a five-main engine designedd to go with the three-sync box up through 1967.

The backplate, in particular, is "suitable for framing" - an absolutely beautiful piece of machine work. I will order a spare one of these days to hang over my fireplace. It includes a new rear mainseal. This is why it won't work with three-main engines as their cranks do not have the appropriate contact surface for the seal.

The Nissan five-speed box shifter comes up out of the tunnel in about the same location as a four-sync shifter. This would be about three inches back from the three-sync shifter. Bill Perry solved half of that problem for me by cutting a Nissan shifter at the base and welding in a piece to displace the shifter forward about 1-1/2". I cut the hole in the tunnel back about 1-3/4" back by about 2" wide. My shifter on the Magnette still easily clears the release button on the hand brake lever. This is the only work I had to do on the Magnette tunnel - a tunnel too small to accommodate either of the MGB overdrive boxes without major cutting and reshaping.

The Rivergate conversion goes together just like reassembling original MGB components. I loved the way it went together, the way Bill Perry supported me, and the way it works! By the way, the kit includes an angle drive for the speedo cable that Bill can just to a wide range of ratios to get your speedometer right.

Happy converting!

Posted 24 May 2004 at 04:58:59 UK time
Glenn Towery, Dover De. U.S.A., mgv8glen@bellatlantic.net

Todd, give me a call & I can get you set up with the rivergate Z 5sp conv. I have done this set up & I think it is great!!!! 9-12 at 302-734-1243

Posted 20 May 2004 at 11:34:47 UK time
E kulick, Pennsylvania, USA, cvhs18472@yahoo.com

John, My B is a 64 but my engine is from a later 67, therefore a 5 main engine that hooks up with a 3 syncro trans. From what I understand, the only differences which would effect trans use would be the size of the spigot (?) bushing and the transmission tunnel. Both of these were addresses when I ordered my kit. It was much cheaper at the time to direct order from England than to buy over here. ED

Posted 19 May 2004 at 17:03:59 UK time
Todd Alkire, Alabama, USA, catalkir@yahoo.com

Thanks for the info. I called Rivergate and they think someone has done this conversion before, but couldn't tell me for sure if it would work. I am hoping someone will come thru on this message board.

Posted 19 May 2004 at 16:53:09 UK time
jegawatt, california, raif@consultant.com

High Gear conversion...


Posted 19 May 2004 at 16:32:55 UK time
Todd Alkire, Alabama, USA, catalkir@yahoo.com


Where can I find out about the HighGear conversion? How much does it cost and how hard is it to find a tranny?

Posted 19 May 2004 at 13:10:08 UK time
John Prewer, Cambridgeshire, UK

E, Kulick, is your engine a 3 bearing or a 5 bearing?


Posted 18 May 2004 at 11:46:43 UK time
E kulick, Pennsylvania, USA, cvhs18472@yahoo.com

Todd, I used the HighGear conversion for my 64B , using a Mekur Trans. Very Nice. The one question they asked me when I ordered it from England was if it was a 3 or 4 speed syncro. There was a little difference in the bell housing and the nose piece bushing. I would gather thatRivergate would be doing the same thing. Call and ask. It took me 1 day to convert to the 5 speed and I have had no problems with it. Much more fun to drive as the gear ratios are much smoother and 4th gear in the Mekur trans is the same ratio as 4th in the B trans. Less problems with many things because of this. Life is good. Ed

Posted 18 May 2004 at 01:58:23 UK time
Andrew Blackley, Chardon, Ohio, USA, akblackley@adelphia.net

Try calling Rivergate directly. Their kit requires changing the engine backing plate to one they make especially for the conversion, which I think should be a direct bolt on to the block, at least for the 5 main bearing engine. You would need to use a later starter motor for sure.
I have a 280ZX 5 speed that I intend to use for my own conversion, so if you need measurements of the tranny just ask.

Posted 17 May 2004 at 22:52:53 UK time
Jeff Schlemmer, Minnesota, USA, jschlemmer1@mn.rr.com

It sounds like you need some advice from Glen Towery. If you email me, I will give you his direect email. I'm not sure he wants it posted.

Posted 17 May 2004 at 21:16:59 UK time
Todd Alkire, Alabama, USA, catalkir@yahoo.com

Has anyone out there installed Rivergate's 5 speed Nissan conversion in a 63 to 67 MGB? Sorry if this is a repetative thread, but I couldn't find anything in the archives specifically for the early non-syncro cars and their smaller transmission tunnels. I would be interested in the conversion if only I didn't have to modify the car. Thanks.

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