Gearbox renewal

[Paul Carey]

Mu six is a CP series, 1970 H reg, but fitted with a Triumph 2000 gearbox with A typr OD. However, I want to replace this with an original box. According to the workshop manual TR6 A type ODs were only fitted to CP and CC series.

 

Questions then:

 

1 What OD type would this car have ahd originally in 1970?

 

2 Which type of OD unit is best - A or J? (Incidentally, is an A type OD for a Triumph 2000 that same as an A type for a TR6?)

 

3 Where is the best place to but well reconditions boxes with ODs? I want to keep to OD in 3 and 4 and have a reverse light switch.

 

4 On what side of the box cover are the OD switches normally accessed?

 

5 On what side of the OD is the speedo drive?

 

Thanks

 

Paul Carey

[foster461]

Mu six is a CP series, 1970 H reg, but fitted with a Triumph 2000 gearbox with A typr OD. However, I want to replace this with an original box. According to the workshop manual TR6 A type ODs were only fitted to CP and CC series.

 

Questions then:

 

1 What OD type would this car have ahd originally in 1970?

 

2 Which type of OD unit is best - A or J? (Incidentally, is an A type OD for a Triumph 2000 that same as an A type for a TR6?)

 

3 Where is the best place to but well reconditions boxes with ODs? I want to keep to OD in 3 and 4 and have a reverse light switch.

 

4 On what side of the box cover are the OD switches normally accessed?

 

5 On what side of the OD is the speedo drive?

 

Thanks

 

Paul Carey

 

Paul, the 70 would have had an A type OD installed. Which is best, well they have pluses and minuses but I would say the J type is simpler and more robust. Many of these OD's are physically similar but may have internal or external differences that might need them to be modified, EG the J-Type from a volvo needs several mods to make it work right in a TR6.

 

Cant quite follow question 3.

 

The OD interlock switches are on the top cover not on the side. There are other non OD switches on the sides of the tranny, possibly varying by year and between UK and federal cars.

 

The speedo drive is on the RHS of the OD, ie on the driver side on a UK car. There is normally a right angle drive adapter so that the speedo cable doesnt have to be tortured. I'm sure we can come up with pictures if you need to see what this all looks like.

 

The J type doent fit on an early frame without some mods as the A type and J type mounts are different. It is not a hard mod to do and there are probably kits.

 

Stan

[Paul Carey]

Paul, the 70 would have had an A type OD installed. Which is best, well they have pluses and minuses but I would say the J type is simpler and more robust. Many of these OD's are physically similar but may have internal or external differences that might need them to be modified, EG the J-Type from a volvo needs several mods to make it work right in a TR6.

 

Cant quite follow question 3.

 

The OD interlock switches are on the top cover not on the side. There are other non OD switches on the sides of the tranny, possibly varying by year and between UK and federal cars.

 

The speedo drive is on the RHS of the OD, ie on the driver side on a UK car. There is normally a right angle drive adapter so that the speedo cable doesnt have to be tortured. I'm sure we can come up with pictures if you need to see what this all looks like.

 

The J type doent fit on an early frame without some mods as the A type and J type mounts are different. It is not a hard mod to do and there are probably kits.

 

Stan

 

 

Thanks Stan

 

Q3 - I meant buy, not but!! Where can I buy a good recon box with an A type OD?

 

Paul

[foster461]

Thanks Stan

 

Q3 - I meant buy, not but!! Where can I buy a good recon box with an A type OD?

 

Paul

 

aha, understood. You will have to get that info from one of our UK friends but it wont be cheap. Over here a rebuilt tranny with rebuilt OD from a specialist would be pushing $3k. Buying a used one and getting it rebuilt might be a cheaper route.

 

Stan