Transmission Fitting
07-09-2007, 07:14 AM
#12
Originally Posted by 1SlowHoe
And you would have sold 2 to me last week had you answered your phone
07-09-2007, 05:10 PM
#13
Originally Posted by Vince @ FLT
Sorry Chris but I myself work in the shop not in the office. You need to leave a message for me to call you back. What year is you 80? If you are going this route with AN fittings and are using a center lube unit (97^) you will need to modify the rear fitting to make it work properly for the later unit. Maybe you should call and leave me a message!
07-09-2007, 05:17 PM
#14
Originally Posted by Vince @ FLT
Only thing that I have a hard time trying to figure out is when the next one is going to break.
07-09-2007, 11:55 PM
#15
The have the same threads per inch as 1/4" NPT, but they're not tapered. You have two choices with this:
- Thread in the NPT adapters carefully and not too tight with semi-hardening thread sealant. Do not crank them in, you can actually crack the trans.
- Or, run a pipe tap into the trans and get some taper to them. Obviously this would only be advisable if the trans is apart so you can clean it, and of course you can't go back to stock. It would be solid and leak-proof though.
The rear fitting on a 4L80-E that Vince mentioned is the return that must protrude through the outer case and through the seal in the center support to lubricate all those parts. If that special fitting isn't used the geartrain, main shaft, and sun shaft will eat themselves up.
Here's a photo that sort of shows the difference in threads.
- Thread in the NPT adapters carefully and not too tight with semi-hardening thread sealant. Do not crank them in, you can actually crack the trans.
- Or, run a pipe tap into the trans and get some taper to them. Obviously this would only be advisable if the trans is apart so you can clean it, and of course you can't go back to stock. It would be solid and leak-proof though.
The rear fitting on a 4L80-E that Vince mentioned is the return that must protrude through the outer case and through the seal in the center support to lubricate all those parts. If that special fitting isn't used the geartrain, main shaft, and sun shaft will eat themselves up.
Here's a photo that sort of shows the difference in threads.
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