4 Speed info

[WI_duker]

I am about ready to rebuild my tranny and was wondering if you need the bearing install tool to put the bearing in the right case for the mainshaft?

[Jrivera1392]

Does anybody have any info on the procedure for replacing the shifter shaft on my 89 4 speed trans. The splines on mine are stripped, does the trans need to come out in order to do this?

[juzyHD]

Yes the trans must go out. You should get a repair manual, it's the easiest way to do things..

[lelo]

question regarding trans sprocket. Im in the process of converting my 87 sportster to a wide gear ratio as mentioned in post #1. I bought a 23 tooth trans sprocket and was gonna leave the rear 48 tooth. Problem is the chain is too small, and i noted if i were able to install the 23 tooth sprocket i would have clearance issues with the chain. could i run the stock 21 tooth trans sprocket with the 48 rear, just temp will i get a new chain or a different size sprockets?

[benton]

To use a 23 front sprocket you'll need to deemed some material away, but a 22 will fit OK. I found a 22/48 ratio to work best for me, but I don't do a lot of freeway miles. The 22/47 combo was a bit too high for me.

[benton]

Originally Posted by juzyHD

Yes the trans must go out. You should get a repair manual, it's the easiest way to do things..

Best tip is to hang some vice grips off the shaft when reinstalling to keep it oriented.

[WI_duker]

I see your zippers double row bearing is made in China as well.

[Saddletramp]

Awesome info on the original post. I came across this a year ago as I was rebuilding the motor while chopping my 90 sportster. Got it all together now as I also used all the info posted on here. There is now a significant difference in top end speeds.

[lelo]

question regarding the mainshaft 2nd gear and countershaft 3rd gear. are there any differences between them. i know both are 23 tooth but one seems thicker and the spacing between the dogs are clearly different. which one is which?

1987 sportster