Looking for a good used accumulator piston for a type A compact overdrive. The part number is 10840. Moss motors calls this overdrive a type G. This is a no longer available part.
I was trying to convert to a 4 speed overdrive, but my be just a 4 speed if I can’t find a piston.
Asking price (if selling):
Location: USA
Contact information: Private message
Cost of shipping (if selling):
Willing to ship worldwide?
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Of your in the states
Quantum mechanics in ct has them along with lkevin Kay restorations in California tell them both Gtjoey sent you
It’s the same as Aston overdrive
You have a jag unit, correct?
Did you get this piston from KKR or Quantum?
If they both were wrong…Call Dave Welsh at WELSH Jag he has them as well, used for the most part, he might have a stash new.
The jag overdrive unit was different but the plunger should really be the same…Aston overdrive is a HUGE unit…
Tell Dave GTJoey said to call.
good luck
gtjoey1314
Yes I have Jag unit. Type G compact overdrive. The pistonis differentthan the type A. I may put a delrin plug in the piston bore and run it as a std 4 speed and forget about the overdrive for now. Attached is the original piston on right with type A on left.
Johnny Vietnam is alright call him back and see if he has the other size, He bought a warehouse of parts in the early 1970’s all bl nos when they went bust.
If not try dave…
good luck
gtjoey1314
I just left Johnny a message call him tomorrow he should be in his wife has been ill
That’s crossed my mind. I may go 5 speed conversion instead of the ancient overdrive unit. It’s not as appealing to me as it was before. I’m in no rush now since it’s winter time here.
I think I will have my replacement machined to the correct depth and hope it holds up. If not I’ll have no overdrive until I swap to a T-5 5 speed transmission.
I think I found a solution. I ordered a Accumulator spring for a Austin Healey 3000 overdrive. It is similar in size, but slightly shorter. I can add spacers if needed. I may put a sleeve inside the piston to take up the extra space around the spring. Hope this works, otherwise I’ll run it as a 4 speed transmission only and forget about the overdrive.
