Gearbox differences

Clutch, Gearbox, Overdrive, Propshaft, Differential, Drive Shafts, Hubs.
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johnnydog
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Gearbox differences

#1 Post by johnnydog » Tue Mar 13, 2018 10:08 pm

I am planning on fitting a replacement 'A' type manual overdrive gearbox to a 1973 PI.
The only good used 'A' type gearbox that I have is from a 1973 2000.
Looking at the official Triumph manual, the MK2 PI gearbox was identified by the letters MD, whereas the MK2 2000 gearbox had the letters MB.
Does anyone know the actual difference between the two?
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

Charles H
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Re: Gearbox differences

#2 Post by Charles H » Wed Mar 14, 2018 12:34 pm

I think that the gearbox is the same, but the A type OD has different springs, (either number or strength or both). The OD can of course be moved from one to the other unless the OD is the problem with your existing 'box.
Charles Harrison
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johnnydog
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Re: Gearbox differences

#3 Post by johnnydog » Wed Mar 14, 2018 7:42 pm

What difference do the springs make? Is it something to do with the greater torque being transmitted through the overdrive unit when engaged?
Register Member no. 1596

1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

Charles H
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Re: Gearbox differences

#4 Post by Charles H » Thu Mar 15, 2018 10:48 am

Basically yes! Not my specialty, maybe have a chat with CW!
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Cherry Red Mk1 2000 Rally Car
Mallard Blue 2.5PI
Sapphire Blue GT6 Mk3
Vermillion Red Spitfire 1500
Pimento Red TR6
Pimento Red Stag
Inky Blue VW Passat B5.5
Arctic Blue Jaguar XJ40

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CAR
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Re: Gearbox differences

#5 Post by CAR » Sat Mar 17, 2018 2:48 pm

I had an MB A type box on my pi when I got it John and it made no difference tbh. Not sure if it had the PI O/D on it or 2000 one. It still worked fine, even on a couple of trackdays.
I spoke to Andy Roberts about it and he said basically the same as Charles.

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johnnydog
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Re: Gearbox differences

#6 Post by johnnydog » Sun Mar 18, 2018 11:05 am

I appreciate the info Charles / Colin - thanks very much! So when the PI turns up on the camp site in Paignton with the caravan on the back, you'll know its been ok!
Register Member no. 1596

1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

Charles H
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Re: Gearbox differences

#7 Post by Charles H » Sun Mar 18, 2018 11:48 am

Looking forward to seeing you there.
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Folkestone
Cherry Red Mk1 2000 Rally Car
Mallard Blue 2.5PI
Sapphire Blue GT6 Mk3
Vermillion Red Spitfire 1500
Pimento Red TR6
Pimento Red Stag
Inky Blue VW Passat B5.5
Arctic Blue Jaguar XJ40

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