250 XB Lower unit

[madkins3138]

I am looking for a 250XB lower unit drive shaft p/n 848831. These are no longer in production. SEI does not make one. My current drive shaft has a speedy sleeve installed where the water seal runs. It is working for now, but for how long.
I am also curious if anyone has successfully installed a different part number 1.75 gear ratio lower unit on the 250XB than what came out of the factory.
Shaft part number 848831 is a relatively short shaft compared to other lower units. There is only about 9" of shaft above the lower unit mounting flange. The engine then uses a coupling and additional shaft that in all total is about 23" from the mating flange.

[JOE54]

no drive shafts and wouldnt repair it with one , but i have installed hundreds of later model torque master gearcases and verado style cases in place of the torque nasty , that 2 piece system high carbon steel shaft is the demise of many a failed gearcase

[madkins3138]

Do you know if the 250XB torque master was a Gen I or Gen II.
And, are you saying if I purchase the correct Gen lower unit with a one piece drive shaft it will bolt up to my engine? Is the total shaft length and spline going to be the same?

[bass.man65]

You need part # 8M0072952 good luck finding a new one, Defiantly some used ones floating around.

[JOE54]

Do you know if the 250XB torque master was a Gen I or Gen II.
And, are you saying if I purchase the correct Gen lower unit with a one piece drive shaft it will bolt up to my engine? Is the total shaft length and spline going to be the same?

yes i am , GEN I is what you have and what you need ,,,, what boat you got , capable of over 80 mph ?????? if not would use a verado style gearcase much better gearing and bearing set up in it

[EuropeanAM]

You know- someone that knows what they're doing building one of those Gen-1 Torquemaster gearcases can easily retrofit that Gen-1 with a later model, one-piece driveshaft, and do-away with the old multi-piece (high dollar) pieces all together.

Done it dozens of times.

BTW... SEI should not be on your list of parts suppliers.

[fish stick]

I may have both of the two piece shafts and coupling, it would be Monday before I can check

[madkins3138]

yes i am , GEN I is what you have and what you need ,,,, what boat you got , capable of over 80 mph ?????? if not would use a verado style gearcase much better gearing and bearing set up in it

Its on a 2002 nitro 929. It used to run 80 mph but I'm older now and that doesn't mean as much.

[madkins3138]

I may have both of the two piece shafts and coupling, it would be Monday before I can check

If you have them that would be great.

Also, thanks to everyone for their input. I see options that I did know I had.

[bass.man65]

I would not use the 2 piece shaft. You can get the newer 1 piece and while at it put the 1 1/4 propshaft in it also.

[madkins3138]

You know- someone that knows what they're doing building one of those Gen-1 Torquemaster gearcases can easily retrofit that Gen-1 with a later model, one-piece driveshaft, and do-away with the old multi-piece (high dollar) pieces all together.

Done it dozens of times.

The 8M0072952 gear case mentioned above is for a 250 Pro XS 3.0 L. Is the drive shaft from that engine p/n 881938 plug and play for the two piece shaft.

[JOE54]

sure is GEN 1 torque master direct replacement for yours, major shimming required to install that shaft in your gearcase extensive knowledge and special tools required for that install

[EuropeanAM]