Yes, single center motor with 2 bar axles to each rack and pinion set...
When you mention side to side adjustment, how would that be done ? Slide seams seem to be about the same when retracted and I have the slide adjusted within 1/8" to each other (slide out measurement).
Do not think there are teeth missing on the rack itself as have looked with a remote cam and all looks fine. Seems to be just the last 4" or so I will here the gear jump and then I am 1" to 2" further out on the leading edge. I then release pin, move gear over and realign to within 1/8" and start over again. Have adjusted height of slide on the individual rail adjustments to try to lower the outer (rack) portion down to the inner (pinion) but does not improve.
I would think if it was motor, the front side would lag or skip as well. Only the rear of the slide. Front travels to full extension as it should and the rear lags the last 4-6" as stated. It obviously skips a few teeth on the spur gear so it seems somehow the rack is raising above the pinion (spur gear) in that 4-6".
Old spur gear had some shiny spots on a few of the teeth but is measured out fine.
I'm thinking you may be on to something in that the slide skews in the last bit of travel, which could be a side to side issue.
Please let me know your thoughts
Thanks