Alpha one drive gear /shaft od 1.50:1

[Jwall26]

I have a alpha one I’m trying to replace the bearings in the upper on the drive gear u-joint shaft. My serial no is 0b496372 there is an f stamped by the serial no. That should make it 1.50:1. I even counted teeth drive gear 22 driven gear 20. Looked up part number for bearings for 1.50:1 ratio part number 31-35988a9. The problem is the bearings are 1 7/8” and 2” id my gear shaft is 1 7/8” od. Wondering if someone replaced the driven gear with one from a different ratio. One thing I’m noticing is the number of teeth of drive and driven gear the numbers are reversed on everything I’ve seen. I just need bearings with 1 7/8” id or at least one more. The spacer is quite a bit thinner in the set I ordered. Thanks for any help in advance.

 

[Bt Doctur]

The inputshaft bearings are both the same and use 2 spacers https://external-content.duckduckgo.com/iu/?u=https://www.bing.com/th?id=OP.kfoAP2juWbyl6g474C474&o=5&pid=21.1&f=1&ipo=products

Do you mean the vert gear bearing?

 

[kenny nunez]

The original 1.32 ratio that came with the Ford 233 hp used the stepped i.d. bearing set. All other engine combinations used bearings that shared the same i.d. What you have is probably a gearhousing that has been rebuilt and parts swapped around. The older this stuff gets the more likely this happens.
When I had my shop I was always rebuilding these things with used housings and parts to help out a customer who‘s housings were beyond repair or were stolen.

 

[Jwall26]

The inputshaft bearings are both the same and use 2 spacers https://external-content.duckduckgo.com/iu/?u=https://www.bing.com/th?id=OP.kfoAP2juWbyl6g474C474&o=5&pid=21.1&f=1&ipo=products

Do you mean the vert gear bearing?

Yes I realize the input shaft should use that same size bearings. I ordered bearings for the 1.50:1 heavy. Apparently I have 1.50:1 non heavy. I’ve got correct bearings now through local shop. On the press fit shaft I thought you’re not supposed to use inner spacer?

 

[Jwall26]

The original 1.32 ratio that came with the Ford 233 hp used the stepped i.d. bearing set. All other engine combinations used bearings that shared the same i.d. What you have is probably a gearhousing that has been rebuilt and parts swapped around. The older this stuff gets the more likely this happens.
When I had my shop I was always rebuilding these things with used housings and parts to help out a customer who‘s housings were beyond repair or were stolen.

Ok. I have gm 230hp and 1:50:1 ratio. It seems the 1.50:1 has the same step on shaft. I have the correct bearings now. Thank You

 

[Bt Doctur]

With a new replacement gear set they want you to remove the small spacer and use rolling torque method, I just reuse the small spacer and just torque the nut down . Never had an issue

 

[Jwall26]

With a new replacement gear set they want you to remove the small spacer and use rolling torque method, I just reuse the small spacer and just torque the nut down . Never had an issue

So you use the small spacer with the press fit setup and have had no problems? The old spacers are thicker than the new is there any Benefit thicker vs thinner spacers?

 

[kenny nunez]

2Xs with the Boat doctor. The last thing you want to do is start switching those spacers or mixing them. When the retainer is tight it should be easy to rotate the shaft with no slack.

 

[Jwall26]

2Xs with the Boat doctor. The last thing you want to do is start switching those spacers or mixing them. When the retainer is tight it should be easy to rotate the shaft with no slack. Originally I took it apart to change seals. As I was reassembling it I came to the rolling torque step. As I tried to slowly tighten it up I never reached 5 inch pounds rolling resistance. I got suspicious and removed the first bearing and there was the small inner spacer. I got a new yoke and bearings nut and washer. I was wondering if it would be better to use the old spacers thicker or new spacers thinner. I wouldn’t try to mix them they are not clove to the same size. With the old bearings and spacers it sure felt smooth torqued to 80 foot pounds. I guess with smaller spacers it would just make the retainer ring and oring set farther in the housing?