84FS460 Posted September 14, 2020 Share Posted September 14, 2020 My 84 f250s speedometer quit working. I removed the speedo cable and hooked a drill up and the speedo works and the gear looks fine.I unhooked the cable at the speedo and drove, the cable spun while I went in reverse but tried to spin when I went forward. Bad drive gear and is it easy to replace in a BW1345 transfer case? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted September 14, 2020 Share Posted September 14, 2020 You will need to pull the rear prop shaft yoke or flange depending on how your truck is equipped. That nut is pretty torqued on there, and I can't really recommend using an impact gun. In a 1345 I do believe you only need to remove the seal to get the drive gear off. It's not like the -56 where there is a collar/clip and a retaining ball that needs to come out. Gary mentioned the other day that his newly rebuilt 1345 is leaking through the splines, so you probably want to use some sealant there. Link to comment Share on other sites More sharing options...
Whisler Posted September 14, 2020 Share Posted September 14, 2020 If the output yoke nut is loose this can cause the same problem. If it is tight then the problem is inside. Link to comment Share on other sites More sharing options...
84FS460 Posted September 15, 2020 Author Share Posted September 15, 2020 Thanks guys for the info. I pointed my camera into the hole and saw the drive gear is bad. So the fun removing the yoke begins. I am also surprised the driven gear isn't damaged. Link to comment Share on other sites More sharing options...
Gary Lewis Posted September 15, 2020 Share Posted September 15, 2020 Thanks guys for the info. I pointed my camera into the hole and saw the drive gear is bad. So the fun removing the yoke begins. I am also surprised the driven gear isn't damaged. Yep, that looks bad. Worn out in the center. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted September 15, 2020 Share Posted September 15, 2020 Yep, that looks bad. Worn out in the center. No worse than the yellow one in my transfer case. 😲 If you use sealant on the splines, put it in the yoke so there's no chance of any getting into the pickup or fluid pump. Pre-lube the new seal, so it doesn't start dry. Link to comment Share on other sites More sharing options...
84FS460 Posted September 15, 2020 Author Share Posted September 15, 2020 Anyone know of a source to find a new drive gear? Link to comment Share on other sites More sharing options...
1986F150Six Posted September 15, 2020 Share Posted September 15, 2020 Anyone know of a source to find a new drive gear? Is the green one mounted on a metal sleeve? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted September 15, 2020 Share Posted September 15, 2020 Is the green one mounted on a metal sleeve? 1345's have them on a sleeve. #8 in the diagram below Borg-Warner pn. 1345-110-002 Link to comment Share on other sites More sharing options...
1986F150Six Posted September 15, 2020 Share Posted September 15, 2020 1345's have them on a sleeve. #8 in the diagram below Borg-Warner pn. 1345-110-002 6, 7 or 8 teeth? Link to comment Share on other sites More sharing options...
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