At 08:37 AM 4/14/97 -0400, you wrote:
>
> Craig,
>
> I wrestled my PC back from my wife. Here's some data that I've compiled
> over the years regarding the O/D swap.
>
> I did a bit of research on the O/D swap and here is what I have found
> from various sources (Bentley, Haynes manuals and A.B Bonds)
>
> There were two types of O/D's fitted to an MGB (D type and LH type).
> There are two types of LH overdrives ( Black label abd Blue label).
> The LH O/Ds are interchangeable, but there are some gotchas:
>
> The Black label is the 'early' LH; the Blue label is the later (~76 on).
> The difference between them is the speedo gear *inside* the overdrive.
> The speedo gears are rare and a royal pain to replace (O/D dissasembly).
> Black label O/D trannys need a different O/D speedo (1280 vs 1000rpmile).
> Blue label O/D trannys and non O/D tranny's use the SAME speedo (~76 on).
> Fitting a Blue label O/D tranny to a pre 76 car requires speedo
> recalibration (there is no pre 76 speedo that will work).
> 77-80 O/D trannys have O/D on 4th gear ONLY (the tranny remote tower is
> different).
> All MGB's from 68 onward use the same length driveshaft (31 1/8).
>
> (this last point has been debated somewhat)
>
> Please correct me if any of these are untrue!
>
> --Scott
>
> Scott Hower --> howersl@ttown.apci.com
> Air Products & Chemicals, Inc. 'Its better to be silent and
> 7201 Hamilton Blvd Trexlertown, PA thought a fool than speak and
> (610) 481-2646 remove all doubt' --A. Lincoln
>
>
>
Hi Scott. I've placed the donor car's speedometer into my B. It is a
5321/04 1000. My old speedometer is a 5320/06S 1280. The overdrive is an LH
black label. I get the same results with both speedometers! The speedo gear
(plastic) is a white one w/22 teeth, same as the original which was stripped.
Craig Wiper
craigw@sonic.net
http://www.sonic.net/~craigw
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