Looking for advice regarding ongoing transmission issue diagnosis/thoughts :)
We have a 2008 CBA. It was occasionally flashing R or 1 and engaging, but sometimes it would jump straight to 2. Weâve had the car at the mechanic for a total of 3 times, approx 7 weeks in total. First round was a line sensor replacement with Dodson parts, plus a few other suggested mods whilst the box was out (Dodson gear lock, complete transmission service kit including tbs clips, valve body rebuild kit, o ring kit). They also did a custom tune, which made the car not change to sixth gear so quickly. It improved the problem a lot (in frequency of flashing and skipping to 2nd but not 100%) but not completely so took it back and they did a complete transmission rebuild. They found a R/1 gear synchro with worn teeth so replaced that, plus some scoring on the 2/4/6 shaft so replaced that + other suggested upgrades whilst it was split apart including Dodson mechanical circlip upgrades. The problem improved again (in frequency of flashing and skipping to 1 but not 100%). Once around this time, the R kept flashing without engaging continuously, so I placed in neutral and back in R and it engaged immediately. Took it back a 3rd time and they did another clutch relearn and tested it about 100 times and all good. But still now after 1 week of driving, the current status I would guess is that it selects R or 1 perfect 89% of time, 1 attempt/flash before success 4% of the time, 2 attempts/flashes before success 3% of the time, 3 attempts/flashes before success 3% of the time and 3 attempts of getting 1st gear before abandoning and skipping to 2nd gear 1% of the time. When selecting R attempts, I can hear a thud for each attempt, but for selecting 1st gear attempts, the thuds are not as obvious. The workshop said they are brainstorming and will get back to me about next steps.
Apart from this, the transmission is very good for driving 1-6. No issues at all when driving.
They also dynoâd the car and itâs performing well for a stock CBA. 307.3 wheel KW power.
Thank you for your time đ