Okay , I got a few things done today. Got the speedo gears in, put a vent on the left rocker, changed the oil/filter, got the high beam indicater light in the right hole. even put in a cigarette lighter. and Hail mary'd the pan/timing cover with some silicone. heres the deal on the speedo for you 700R4 guys.
First this is what happens if you hit the wrong hole.
After calculating the needed gears, check your housing to see if it supports the right gears, the numbers are what gears fit that particular housing. I needed a 45 so I got a new housing.
This just a pic of the speedo housing removed, you do not need to take this out first to take the tail shaft off, mine was just used to coming out !
what will be staring at you after you remove the tail housing. The drive gear can be slid off by depressing the end of the retainer clip with a screwdriver or a dental pick, it may need some coaxing. I just bump tapped it from behind with a small hammer.
When installing the new drive gear and clip make sure the tang on the clip sits in the hole closest to the main trans housing.
Putting a new gear on goes a bit tight and you have to have the groove in the gear lined up with the clip as you slide/drive it on. I again gently tapped with a small hammer but the correct size tube would be way better.
These are the new parts I got from Bowtie Overdrive.
This is the driven gear installed in the housing.
This is the old external clip I had to use for now because they didnt ship the new one I thought I ordered. The new billet housing uses a different anti spin clip than the original , but it works for now, you just cannot over tighten your speedo cable without it turning a bit.
Anyway my speedometer reads pretty damn close now if my tach calculations are right ! On a side note you will lose some tranny fluid when you pop the tailshaft housing so have a catch pan ready. This actually is a pretty easy DIY, drop the drive shaft . the tail bolts are 15 mm and the external retainer is 10mm, and a pair of pliers and small hammer. I did use a slight coating of silicone on the tailshaft housing O ring and the speedo drive O ring when I re assembled.