489 or 742 in 741? (8 3/4)

[goldduster]

If the housing had a 741 case in it when new, can you put a 489 or 742 case in there?

[ChristianCuda]

If you are talking about changing the pumpkins out yes you can. If you are talking about putting a 742 or 489 gearset in a 741 pumpkin no you cant

Christian

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[BugEyedValiant]

You can also take a SureGrip from a 742 or a 489 and install it into a 741 case if you use the right carrier bearings.

[SB Racer]

You can also put 489 case gears into 742 case, needs some lathe work on the pinion bearing surface. It holds, using one in my racecar right now. Needed to do this swap two seasons ago 'cause of budget reasons and it's still there

TeRo http://www.paalupaikka.com/racevaliant

[440 Jim]

Originally posted by SB Racer:
You can also put 489 case gears into 742 case, needs some lathe work on the pinion bearing surface.
TeRo

You might get by with a precision lathe cut, but for the part of the shaft that the bearing mounts to, I would recommend a tool post grinder on the lathe. I don't know the shaft size tolerance recommended by Timken, but I would guess it is no more than 0.0005 inches.

[440 Jim]

Originally posted by BugEyedValiant:
You can also take a SureGrip from a 742 or a 489 and install it into a 741 case if you use the right carrier bearings.

That is my understanding too. However, I am not sure which bearings to use. I think you use the bearings for the suregrip you are using. This implies all the bearings fit under the (741,742,489) case bearing caps. Can anyone verify for sure?

[Stan Cameron]

FYI, I could not get suregrip to fit 741 case.

Regards,

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[rumblefish360]

I have had a 742 ring & pinion installed in a 741 case. If there was work that was done to make it fit, I don't know about it. It's been8yrs now. No problems.