Would the Gentlemen that sent me the photos of the TT Gears kindly resend them as I lost them on my computer. Thanks, Bill
It wasn't me, but I sent you a private message. The Forum email system won't let me attach the drawing to the message, so if you just answer my email I'll send you what I have for a TT rear end. It's a labeled cross section drawing, not photos, but it may help you.
My email and the attached drawing sheet should be in your email inbox.
are these what you wanted ?
This is not shown too clearly in the drawings or the cutaway but may be useful to know. Sandwiched between the two differential gear case halves is either a pinion shaft (looks lie I) or a differential pinion spider looks like X). The best information I have is that the shaft was used from 1918 until 1923. then, for 1923 through 1927 the spider was used.
Outside of that, the only other internal variable is the gear ratio. If you take your rear end apart, you can easily tell which is which. The 7 1/4:1 ring gear has 29 teeth, and the 5 1/16:1 has 31 teeth.
Neat cutaway photo. I've never seen that one before. It appears to be of an early truck since it looks like a short (one hole each side) rear chassis cross member and there's a shadow of the bead on the clamshell at the axle tube that was eliminated early on. Thanks for posting it!
Bill what are you needing for the TT rear end, I have lots of parts here email@example.com
I have a TT worm gear and bearings I got in a box from a sale if anyone needs one. PK
Pat - What ratio gears do you have? Or to put it another way, how many teeth are on the ring gear - 29 or 31, as described by Henry in his post above.
I'm sorry Keith, I only have the worm. PK
Interesting is the fact that in the TT parts book as well as in the diagrams posted above by Tom the gears are the worm and the worm gear. Seems to me everyone would have been better off if they'd called them the worm and the ring gear. It would have avoided a lot of confusion!
Henry, I have two TT rear ends and I was surprised to find - just as you said. One had the pinion shaft and the other a spider. Really surprised me as I thought they would all be the same. Glad you like the drawings / photo, best I can recall, I got them off this site. Which I really enjoy looking through every night :-)
My truck is an early TT and has the pinion shaft. I've always wondered why Ford changed it to the spider. I've never heard of either one failing. Sort of give pause for thought.