Haven't been able to find a copy and am in desperate need of it. I was lucky enough to find an NOS one.Overdrives Overdrives Does anyone have the Laycock de Normanville Overdrive Service Manual? I You should be able to find the instructions on this site somewhere. Some one had devised a way to wire up two non-stock relays to duplicate that. But with the SV box, once you drop out of 3rd, the OD goes off and never comes back on unless you spring up the OD stalk again.Īt least when I did the installation, the relay necessary for the SV version was close to impossible to get - though I found one. With the S1-IV OD, if you leave the switch in the "on" position, the OD always comes on when you go in 3 or 4. The OD unit has switches on the box that allows the OD to turn on if you are in 3rd or 4th, and otherwise turns off the OD. The stalk was always in the middle you could push it up and down, but it would spring back to the middle. The S1-IV OD switch clicked on and clicked off, and there was a light on the dash if it was clicked on. Here is another difference not listed here.
You should seriously NOT consider just buying parts, most are junk, instead buy a complete and tested unit, trust me here as the owner of 2 junk OD transmissions and 2 equally junk OD units. (You can use these OD units if you modify your drive shaft for a sliding joint and a flange from the donor vehicle)īased on your question, you may be unaware that the overdrive unit is one item, the more important item is the overdrive transmission, which is different from the std transmission and uses a special trans mainshaft and OD adapter. Nearly all other MFGRs of cars used a flange type output on the OD making these far more common than the rootes variety. Rootes had a special "D" type that uses a splined output shaft like the std transmission, that part (the anulous) is also the most damaged part since the shaft can twist with a clutch dump. Only the D type OD is used on series alpines, later rootes vehicles used the J type but this transmission is too long to integrate into the series alpine chassis without major mods (and likley using the non rootes flange type OD unit).
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