Advice on fitting M41 + D-type O/D to 1970 145

[laptoprob]

Originally Posted by kean

I'm really interested as I would like to know if a '66 P1800 overdrive box could fit my '72 145.

No problem. You only have to swithc the gearbox covers. And take care of the reverse light switch on the box. That may be different.

[WPR678B]

I thought that it was time to re-visit this now! I have dug the gearbox out from the back of the garage where it was put in disgust and have given it a good cleandown ready to split the overdrive unit from the gearbox so i can see whats what.
On cleaning it down i found a little tag on the base of the gearbox that says M40G with a part number of 254498.
Now i thought that the gearbox with overdrive was an M41 unit?
Am i missing sonmething here being totally new to the Volvo gearbox scene?
I was also told that this set up was from a 1969 2 litre P1800, but the box clearly has 1964/65 date markings on it, so i am presuming it is a very early overdrive box maybe?
Can anyone confirm the overdrive type for me, i am sure from all the information i can find that it is a D-type?
Many thanks in advance for your input!

[Derek UK]

This is a D type OD. Going by the gear lever extension, probably from an 1800of the dates quoted. J type came along with the B20. Solenoid is on the opposite side on the J and actually says "J" on the information plate.

[laptoprob]

Yes, it's a D-type from an 1800. No worries, it will fit just fine under your 145. Just swap the top covers. I have a D-type myself under my '70 145. The reduction is just a little more than with a J-type, so it runs a bit quiter.

Do you have a short prop and a fitting box support crossbeam? That's different than the regular M40 crossmember. If you carefully cut enough bits out, it can made to fit though.

[WPR678B]

Thank you for your replies.
I split the overdrive unit from the gearbox today as something is VERY stiff to turn and as suspected, its the overdrive unit. The gearbox turns freely by hand, but the overdrive is as good as solid.
Looks as if a stripdown is on the cards for that now then!
Any advice gratefully received!!

Originally Posted by laptoprob

Do you have a short prop and a fitting box support crossbeam? That's different than the regular M40 crossmember. If you carefully cut enough bits out, it can made to fit though.

I have the prop that came from the P1800 that looks as if its the right length from the quick measure up i had, so fingers crossed on that one!
As for the crossmember, i do not have one yet, but would one from an Amazon that had a D-type overdrive set up suit do you know?

[laptoprob]

Originally Posted by WPR678B

I have the prop that came from the P1800 that looks as if its the right length from the quick measure up i had, so fingers crossed on that one!
As for the crossmember, i do not have one yet, but would one from an Amazon that had a D-type overdrive set up suit do you know?

Measure length en flange sizes. You might be lucky, but I doubt it will fit. The center bearing/rubber is different.

Crossmemeber: I think different as well. But you might frankenstein one from the original and the Amaon one!

[Derek UK]

The 140 used a heavier duty, larger diameter prop with bigger UJ's. As said, flanges are different too. Probably best to have your 145 front prop shortened to suit your car. I think that the J OD is a smidgin longer than the D type so shorten the prop to fit the car rather than just to the normal J type/140 length. There are spline differences with the outputs from the D and J and this is the usual stumblng block with regard to flanges.

[940_Turbo]

Originally Posted by Derek UK

The 140 used a heavier duty, larger diameter prop with bigger UJ's. As said, flanges are different too. Probably best to have your 145 front prop shortened to suit your car. I think that the J OD is a smidgin longer than the D type so shorten the prop to fit the car rather than just to the normal J type/140 length. There are spline differences with the outputs from the D and J and this is the usual stumblng block with regard to flanges.

Not necessarily, carburettor cars used the same size prop as a 120, only late injection cars had the big prop.

[laptoprob]

I swapped a M41 with a D overdrive for a J-type. No real length difference, the splines will adjust a bit of difference. Propshaft can remain unchanged, only the flange needs to be different. Higher powered motors did have a bigger prop, but that isn't really necessary.
Easiest way is to get your prop shortened and source a fitting flange.

[tonydgray]

I'm in the process of fitting a m410 gearbox/overdrive unit to my 145 and have just sorted the propshaft out. I had the issue with the larger flange on the overdrive and a small flange on the prop. There seem to be various options out there to get the bits to bolt up but its sourcing the parts that I found difficult. In the end I am getting my original prop shortened along with a new small flange for the overdrive from amazon cars, now everything should fit together.

I'm hopefully picking up the propshaft on saturday and the flange should be with me today so bolting the bits together to make sure they play nicely and then its onto the crossmember which I have not got a clue about yet!!

I hope the work on your overdrive is going to plan.

Cheers

Tony