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Jackal rear drive swap


Tuned and Synch'ed
Jul 16, 2010
SE Iowa
I've sort of gotten used to the ridiculously tall final drive ratio on my Jackal, but my dad (who is retiring soon and will be moving closer) hates it. He wondered how hard it is to change gears in the bevel box, and it occurred to me "well, I guess I have a stock '77 850T3 swingarm in the shed..."
I don't want to set up/shim a new set of gears, so my question is can I bolt on the complete rear drive from the 850T3 onto the Jackal swingarm? They sure look similar...
The rear drive will swap, yes. You may have some wheel spacer swaps to do, and before you invest the time, check to see that the ratio is different. There is 7/33 (short) and 8/33 (tall). I tried the 7/33 on my Jackal and hated it for the long-legged roads and speeds of the Southwest US. The trade off is better acceleration, but higher revs at speed if that matters to you.
Around here the average highway is 60-65mph and the interstate is 70mph. Not that anyone actually follows the speed limits. When I was riding the T3 I never seemed to mind the rpms at 75mph. I do realize that with the different fairing/exhaust/lighter flywheel of my Jackal my perception of the engine speed might not be the same as it was on the T3.
When Dad rides my bike he usually leaves it in 4th gear for any highway under 65-70. I will say that 5th gear really does seem to smooth out around 75-80 indicated.
Thanks for the info, I suppose I'm not out much if I swap it over and decide it is too short, I can just put the stock drive back on it. I just wanted to make sure they actually did swap over! Thanks!
I dug out my old G5/T3 workshop manual. With 8/33 the overall ratio in 4th gear is almost identical to 7/33 in fifth. I also love the ridiculously tall 5th of the Jack, but In some areas the lower gearing could be quite nice.
Just remember that your speedo is going to be out by quite a bit.
Nothing a wireless bicycle speedo couldn't fix.
Passing your favorite bike on to your dad? Priceless......